FreeBSD/Linux Kernel Cross Reference
sys/kern/subr_msan.c

     /*      $NetBSD: subr_msan.c,v 1.18 2022/10/26 23:38:09 riastradh Exp $ */
     
     /*
      * Copyright (c) 2019-2020 Maxime Villard, m00nbsd.net
      * All rights reserved.
      *
      * This code is part of the KMSAN subsystem of the NetBSD kernel.
      *
      * Redistribution and use in source and binary forms, with or without
     * modification, are permitted provided that the following conditions
     * are met:
     * 1. Redistributions of source code must retain the above copyright
     *    notice, this list of conditions and the following disclaimer.
     * 2. Redistributions in binary form must reproduce the above copyright
     *    notice, this list of conditions and the following disclaimer in the
     *    documentation and/or other materials provided with the distribution.
     *
     * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
     * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
     * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
     * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
     * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
     * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES;
     * LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
     * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
     * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
     * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
     * SUCH DAMAGE.
     */
    
    #include <sys/cdefs.h>
    __KERNEL_RCSID(0, "$NetBSD: subr_msan.c,v 1.18 2022/10/26 23:38:09 riastradh Exp $");
    
    #include <sys/param.h>
    #include <sys/device.h>
    #include <sys/kernel.h>
    #include <sys/param.h>
    #include <sys/conf.h>
    #include <sys/systm.h>
    #include <sys/types.h>
    #include <sys/kprintf.h>
    #include <sys/kmem.h>
    #include <sys/mbuf.h>
    #include <sys/buf.h>
    #include <sys/cpu.h>
    #include <sys/msan.h>
    
    #include <ddb/db_active.h>
    
    static void kmsan_printf(const char *, ...);
    
    void kmsan_init_arg(size_t);
    void kmsan_init_ret(size_t);
    
    #ifdef KMSAN_PANIC
    #define REPORT panic
    #else
    #define REPORT kmsan_printf
    #endif
    
    /* -------------------------------------------------------------------------- */
    
    /*
     * Part of the compiler ABI.
     */
    
    typedef uint32_t msan_orig_t;
    
    typedef struct {
            uint8_t *shad;
            msan_orig_t *orig;
    } msan_meta_t;
    
    #define MSAN_PARAM_SIZE         800
    #define MSAN_RETVAL_SIZE        800
    typedef struct {
            uint8_t param[MSAN_PARAM_SIZE];
            uint8_t retval[MSAN_RETVAL_SIZE];
            uint8_t _va_arg[MSAN_PARAM_SIZE];
            uint8_t va_arg_origin[MSAN_PARAM_SIZE];
            uint64_t va_arg_overflow_size;
            msan_orig_t param_origin[MSAN_PARAM_SIZE];
            msan_orig_t retval_origin;
            msan_orig_t origin;
    } msan_tls_t;
    
    /* -------------------------------------------------------------------------- */
    
    /* The MD code. */
    #include <machine/msan.h>
    
    /* -------------------------------------------------------------------------- */
    
    #define __RET_ADDR      (uintptr_t)__builtin_return_address(0)
    #define MSAN_NCONTEXT   16
    
    typedef struct {
            size_t ctx;
            msan_tls_t tls[MSAN_NCONTEXT];
   } msan_lwp_t;
   
   static msan_tls_t dummy_tls;
   
   static uint8_t msan_dummy_shad[PAGE_SIZE] __aligned(PAGE_SIZE);
   static uint8_t msan_dummy_orig[PAGE_SIZE] __aligned(PAGE_SIZE);
   static msan_lwp_t msan_lwp0;
   static bool kmsan_enabled __read_mostly;
   
   /* -------------------------------------------------------------------------- */
   
   static bool kmsan_reporting = false;
   
   static inline void
   kmsan_printf(const char *fmt, ...)
   {
           va_list ap;
   
           va_start(ap, fmt);
           kprintf(fmt, TOCONS, NULL, NULL, ap);
           va_end(ap);
   }
   
   static inline const char *
   kmsan_orig_name(int type)
   {
           switch (type) {
           case KMSAN_TYPE_STACK:
                   return "Stack";
           case KMSAN_TYPE_KMEM:
                   return "Kmem";
           case KMSAN_TYPE_MALLOC:
                   return "Malloc";
           case KMSAN_TYPE_POOL:
                   return "Pool";
           case KMSAN_TYPE_UVM:
                   return "Uvm";
           default:
                   return "Unknown";
           }
   }
   
   /*
    * The format of the string is: "----var@function". Parse it to display a nice
    * warning.
    */
   static void
   kmsan_report_hook(const void *addr, size_t size, size_t off, const char *hook)
   {
           const char *mod, *sym;
           msan_orig_t *orig;
           const char *typename;
           char *var, *fn;
           uintptr_t ptr;
           char buf[128];
           int type;
           int s;
   
           if (__predict_false(panicstr != NULL || db_active || kmsan_reporting))
                   return;
   
           kmsan_reporting = true;
           __insn_barrier();
   
           orig = (msan_orig_t *)kmsan_md_addr_to_orig(addr);
           orig = (msan_orig_t *)((uintptr_t)orig & ~0x3);
   
           if (*orig == 0) {
                   REPORT("MSan: Uninitialized Memory In %s At Offset "
                       "%zu\n", hook, off);
                   goto out;
           }
   
           kmsan_md_orig_decode(*orig, &type, &ptr);
           typename = kmsan_orig_name(type);
   
           if (kmsan_md_is_pc(ptr)) {
                   s = pserialize_read_enter();
                   if (ksyms_getname(&mod, &sym, (vaddr_t)ptr, KSYMS_PROC)) {
                           REPORT("MSan: Uninitialized %s Memory In %s "
                               "At Offset %zu/%zu, IP %p\n", typename, hook, off,
                               size, (void *)ptr);
                   } else {
                           REPORT("MSan: Uninitialized %s Memory In %s "
                               "At Offset %zu/%zu, From %s()\n", typename, hook,
                               off, size, sym);
                   }
                   pserialize_read_exit(s);
           } else {
                   var = (char *)ptr + 4;
                   strlcpy(buf, var, sizeof(buf));
                   var = buf;
                   fn = __builtin_strchr(buf, '@');
                   *fn++ = '\0';
                   REPORT("MSan: Uninitialized %s Memory In %s At Offset "
                       "%zu, Variable '%s' From %s()\n", typename, hook, off,
                       var, fn);
           }
   
   out:
           kmsan_md_unwind();
           __insn_barrier();
           kmsan_reporting = false;
   }
   
   static void
   kmsan_report_inline(msan_orig_t orig, unsigned long pc)
   {
           const char *mod, *sym;
           const char *typename;
           char *var, *fn;
           uintptr_t ptr;
           char buf[128];
           int type;
           int s;
   
           if (__predict_false(panicstr != NULL || db_active || kmsan_reporting))
                   return;
   
           kmsan_reporting = true;
           __insn_barrier();
   
           if (orig == 0) {
                   REPORT("MSan: Uninitialized Variable In %p\n",
                       (void *)pc);
                   goto out;
           }
   
           kmsan_md_orig_decode(orig, &type, &ptr);
           typename = kmsan_orig_name(type);
   
           if (kmsan_md_is_pc(ptr)) {
                   s = pserialize_read_enter();
                   if (ksyms_getname(&mod, &sym, (vaddr_t)ptr, KSYMS_PROC)) {
                           REPORT("MSan: Uninitialized %s Memory, "
                               "Origin %x\n", typename, orig);
                   } else {
                           REPORT("MSan: Uninitialized %s Memory "
                               "From %s()\n", typename, sym);
                   }
                   pserialize_read_exit(s);
           } else {
                   var = (char *)ptr + 4;
                   strlcpy(buf, var, sizeof(buf));
                   var = buf;
                   fn = __builtin_strchr(buf, '@');
                   *fn++ = '\0';
                   REPORT("MSan: Uninitialized Variable '%s' From %s()\n",
                       var, fn);
           }
   
   out:
           kmsan_md_unwind();
           __insn_barrier();
           kmsan_reporting = false;
   }
   
   /* -------------------------------------------------------------------------- */
   
   static inline msan_meta_t
   kmsan_meta_get(void *addr, size_t size)
   {
           msan_meta_t ret;
   
           if (__predict_false(!kmsan_enabled)) {
                   ret.shad = msan_dummy_shad;
                   ret.orig = (msan_orig_t *)msan_dummy_orig;
           } else if (__predict_false(kmsan_md_unsupported((vaddr_t)addr))) {
                   ret.shad = msan_dummy_shad;
                   ret.orig = (msan_orig_t *)msan_dummy_orig;
           } else {
                   ret.shad = (void *)kmsan_md_addr_to_shad(addr);
                   ret.orig = (msan_orig_t *)kmsan_md_addr_to_orig(addr);
                   ret.orig = (msan_orig_t *)((uintptr_t)ret.orig & ~0x3);
           }
   
           return ret;
   }
   
   static inline void
   kmsan_origin_fill(void *addr, msan_orig_t o, size_t size)
   {
           msan_orig_t *orig;
           size_t i;
   
           if (__predict_false(!kmsan_enabled))
                   return;
           if (__predict_false(kmsan_md_unsupported((vaddr_t)addr)))
                   return;
   
           orig = (msan_orig_t *)kmsan_md_addr_to_orig(addr);
           size += ((uintptr_t)orig & 0x3);
           orig = (msan_orig_t *)((uintptr_t)orig & ~0x3);
   
           for (i = 0; i < size; i += 4) {
                   orig[i / 4] = o;
           }
   }
   
   static inline void
   kmsan_shadow_fill(void *addr, uint8_t c, size_t size)
   {
           uint8_t *shad;
   
           if (__predict_false(!kmsan_enabled))
                   return;
           if (__predict_false(kmsan_md_unsupported((vaddr_t)addr)))
                   return;
   
           shad = kmsan_md_addr_to_shad(addr);
           __builtin_memset(shad, c, size);
   }
   
   static inline void
   kmsan_meta_copy(void *dst, const void *src, size_t size)
   {
           uint8_t *orig_src, *orig_dst;
           uint8_t *shad_src, *shad_dst;
           msan_orig_t *_src, *_dst;
           size_t i;
   
           if (__predict_false(!kmsan_enabled))
                   return;
           if (__predict_false(kmsan_md_unsupported((vaddr_t)dst)))
                   return;
           if (__predict_false(kmsan_md_unsupported((vaddr_t)src))) {
                   kmsan_shadow_fill(dst, KMSAN_STATE_INITED, size);
                   return;
           }
   
           shad_src = kmsan_md_addr_to_shad(src);
           shad_dst = kmsan_md_addr_to_shad(dst);
           __builtin_memmove(shad_dst, shad_src, size);
   
           orig_src = kmsan_md_addr_to_orig(src);
           orig_dst = kmsan_md_addr_to_orig(dst);
           for (i = 0; i < size; i++) {
                   _src = (msan_orig_t *)((uintptr_t)orig_src & ~0x3);
                   _dst = (msan_orig_t *)((uintptr_t)orig_dst & ~0x3);
                   *_dst = *_src;
                   orig_src++;
                   orig_dst++;
           }
   }
   
   static inline void
   kmsan_shadow_check(const void *addr, size_t size, const char *hook)
   {
           uint8_t *shad;
           size_t i;
   
           if (__predict_false(!kmsan_enabled))
                   return;
           if (__predict_false(kmsan_md_unsupported((vaddr_t)addr)))
                   return;
   
           shad = kmsan_md_addr_to_shad(addr);
           for (i = 0; i < size; i++) {
                   if (__predict_true(shad[i] == 0))
                           continue;
                   kmsan_report_hook((const char *)addr + i, size, i, hook);
                   break;
           }
   }
   
   void
   kmsan_init_arg(size_t n)
   {
           msan_lwp_t *lwp;
           uint8_t *arg;
   
           if (__predict_false(!kmsan_enabled))
                   return;
           lwp = curlwp->l_kmsan;
           arg = lwp->tls[lwp->ctx].param;
           __builtin_memset(arg, 0, n);
   }
   
   void
   kmsan_init_ret(size_t n)
   {
           msan_lwp_t *lwp;
           uint8_t *arg;
   
           if (__predict_false(!kmsan_enabled))
                   return;
           lwp = curlwp->l_kmsan;
           arg = lwp->tls[lwp->ctx].retval;
           __builtin_memset(arg, 0, n);
   }
   
   static void
   kmsan_check_arg(size_t size, const char *hook)
   {
           msan_lwp_t *lwp;
           uint8_t *arg;
           size_t i;
   
           if (__predict_false(!kmsan_enabled))
                   return;
           lwp = curlwp->l_kmsan;
           arg = lwp->tls[lwp->ctx].param;
   
           for (i = 0; i < size; i++) {
                   if (__predict_true(arg[i] == 0))
                           continue;
                   kmsan_report_hook((const char *)arg + i, size, i, hook);
                   break;
           }
   }
   
   void
   kmsan_lwp_alloc(struct lwp *l)
   {
           msan_lwp_t *lwp;
   
           kmsan_init_arg(sizeof(size_t) + sizeof(km_flag_t));
           lwp = kmem_zalloc(sizeof(msan_lwp_t), KM_SLEEP);
           lwp->ctx = 1;
   
           l->l_kmsan = lwp;
   }
   
   void
   kmsan_lwp_free(struct lwp *l)
   {
           kmsan_init_arg(sizeof(void *) + sizeof(size_t));
           kmem_free(l->l_kmsan, sizeof(msan_lwp_t));
   }
   
   void kmsan_intr_enter(void);
   void kmsan_intr_leave(void);
   void kmsan_softint(struct lwp *);
   
   void
   kmsan_intr_enter(void)
   {
           msan_lwp_t *lwp;
   
           if (__predict_false(!kmsan_enabled))
                   return;
           lwp = curlwp->l_kmsan;
   
           lwp->ctx++;
           if (__predict_false(lwp->ctx >= MSAN_NCONTEXT)) {
                   kmsan_enabled = false;
                   panic("%s: lwp->ctx = %zu", __func__, lwp->ctx);
           }
   
           kmsan_init_arg(sizeof(void *));
   }
   
   void
   kmsan_intr_leave(void)
   {
           msan_lwp_t *lwp;
   
           if (__predict_false(!kmsan_enabled))
                   return;
           lwp = curlwp->l_kmsan;
   
           if (__predict_false(lwp->ctx == 0)) {
                   kmsan_enabled = false;
                   panic("%s: lwp->ctx = %zu", __func__, lwp->ctx);
           }
           lwp->ctx--;
   }
   
   void
   kmsan_softint(struct lwp *l)
   {
           kmsan_init_arg(sizeof(lwp_t *) + sizeof(int));
   }
   
   /* -------------------------------------------------------------------------- */
   
   void
   kmsan_shadow_map(void *addr, size_t size)
   {
           size_t npages, i;
           vaddr_t va;
   
           KASSERT((vaddr_t)addr % PAGE_SIZE == 0);
           KASSERT(size % PAGE_SIZE == 0);
   
           npages = size / PAGE_SIZE;
   
           va = (vaddr_t)kmsan_md_addr_to_shad(addr);
           for (i = 0; i < npages; i++) {
                   kmsan_md_shadow_map_page(va + i * PAGE_SIZE);
           }
   
           va = (vaddr_t)kmsan_md_addr_to_orig(addr);
           for (i = 0; i < npages; i++) {
                   kmsan_md_shadow_map_page(va + i * PAGE_SIZE);
           }
   }
   
   void
   kmsan_orig(void *addr, size_t size, int type, uintptr_t pc)
   {
           msan_orig_t orig;
   
           orig = kmsan_md_orig_encode(type, pc);
           kmsan_origin_fill(addr, orig, size);
   }
   
   void
   kmsan_mark(void *addr, size_t size, uint8_t c)
   {
           kmsan_shadow_fill(addr, c, size);
   }
   
   void
   kmsan_check_mbuf(void *buf)
   {
           struct mbuf *m = buf;
   
           do {
                   kmsan_shadow_check(mtod(m, void *), m->m_len, "MbufChain");
           } while ((m = m->m_next) != NULL);
   }
   
   void
   kmsan_check_buf(void *buf)
   {
           buf_t *bp = buf;
   
           kmsan_shadow_check(bp->b_data, bp->b_bcount, "bwrite()");
   }
   
   void
   kmsan_init(void *stack)
   {
           /* MD initialization. */
           kmsan_md_init();
   
           /* Map the stack. */
           kmsan_shadow_map(stack, USPACE);
   
           /* Initialize the TLS for curlwp. */
           msan_lwp0.ctx = 1;
           curlwp->l_kmsan = &msan_lwp0;
   
           /* Now officially enabled. */
           kmsan_enabled = true;
   }
   
   /* -------------------------------------------------------------------------- */
   
   msan_meta_t __msan_metadata_ptr_for_load_n(void *, size_t);
   msan_meta_t __msan_metadata_ptr_for_store_n(void *, size_t);
   
   msan_meta_t __msan_metadata_ptr_for_load_n(void *addr, size_t size)
   {
           return kmsan_meta_get(addr, size);
   }
   
   msan_meta_t __msan_metadata_ptr_for_store_n(void *addr, size_t size)
   {
           return kmsan_meta_get(addr, size);
   }
   
   #define MSAN_META_FUNC(size)                                            \
           msan_meta_t __msan_metadata_ptr_for_load_##size(void *);        \
           msan_meta_t __msan_metadata_ptr_for_load_##size(void *addr)     \
           {                                                               \
                   return kmsan_meta_get(addr, size);                      \
           }                                                               \
           msan_meta_t __msan_metadata_ptr_for_store_##size(void *);       \
           msan_meta_t __msan_metadata_ptr_for_store_##size(void *addr)    \
           {                                                               \
                   return kmsan_meta_get(addr, size);                      \
           }
   
   MSAN_META_FUNC(1)
   MSAN_META_FUNC(2)
   MSAN_META_FUNC(4)
   MSAN_META_FUNC(8)
   
   void __msan_instrument_asm_store(void *, size_t);
   msan_orig_t __msan_chain_origin(msan_orig_t);
   void __msan_poison_alloca(void *, uint64_t, char *);
   void __msan_unpoison_alloca(void *, uint64_t);
   void __msan_warning(msan_orig_t);
   msan_tls_t *__msan_get_context_state(void);
   
   void __msan_instrument_asm_store(void *addr, size_t size)
   {
           kmsan_shadow_fill(addr, KMSAN_STATE_INITED, size);
   }
   
   msan_orig_t __msan_chain_origin(msan_orig_t origin)
   {
           return origin;
   }
   
   void __msan_poison_alloca(void *addr, uint64_t size, char *descr)
   {
           msan_orig_t orig;
   
           orig = kmsan_md_orig_encode(KMSAN_TYPE_STACK, (uintptr_t)descr);
           kmsan_origin_fill(addr, orig, size);
           kmsan_shadow_fill(addr, KMSAN_STATE_UNINIT, size);
   }
   
   void __msan_unpoison_alloca(void *addr, uint64_t size)
   {
           kmsan_shadow_fill(addr, KMSAN_STATE_INITED, size);
   }
   
   void __msan_warning(msan_orig_t origin)
   {
           if (__predict_false(!kmsan_enabled))
                   return;
           kmsan_report_inline(origin, __RET_ADDR);
   }
   
   msan_tls_t *__msan_get_context_state(void)
   {
           msan_lwp_t *lwp;
   
           if (__predict_false(!kmsan_enabled))
                   return &dummy_tls;
           lwp = curlwp->l_kmsan;
   
           return &lwp->tls[lwp->ctx];
   }
   
   /* -------------------------------------------------------------------------- */
   
   /*
    * Function hooks. Mostly ASM functions which need KMSAN wrappers to handle
    * initialized areas properly.
    */
   
   void *kmsan_memcpy(void *dst, const void *src, size_t len)
   {
           /* No kmsan_check_arg, because inlined. */
           kmsan_init_ret(sizeof(void *));
           if (__predict_true(len != 0)) {
                   kmsan_meta_copy(dst, src, len);
           }
           return __builtin_memcpy(dst, src, len);
   }
   
   int
   kmsan_memcmp(const void *b1, const void *b2, size_t len)
   {
           const uint8_t *_b1 = b1, *_b2 = b2;
           size_t i;
   
           kmsan_check_arg(sizeof(b1) + sizeof(b2) + sizeof(len),
               "memcmp():args");
           kmsan_init_ret(sizeof(int));
   
           for (i = 0; i < len; i++) {
                   if (*_b1 != *_b2) {
                           kmsan_shadow_check(b1, i + 1, "memcmp():arg1");
                           kmsan_shadow_check(b2, i + 1, "memcmp():arg2");
                           return *_b1 - *_b2;
                   }
                   _b1++, _b2++;
           }
   
           return 0;
   }
   
   void *kmsan_memset(void *dst, int c, size_t len)
   {
           /* No kmsan_check_arg, because inlined. */
           kmsan_shadow_fill(dst, KMSAN_STATE_INITED, len);
           kmsan_init_ret(sizeof(void *));
           return __builtin_memset(dst, c, len);
   }
   
   void *kmsan_memmove(void *dst, const void *src, size_t len)
   {
           /* No kmsan_check_arg, because inlined. */
           if (__predict_true(len != 0)) {
                   kmsan_meta_copy(dst, src, len);
           }
           kmsan_init_ret(sizeof(void *));
           return __builtin_memmove(dst, src, len);
   }
   
   __strong_alias(__msan_memcpy, kmsan_memcpy)
   __strong_alias(__msan_memset, kmsan_memset)
   __strong_alias(__msan_memmove, kmsan_memmove)
   
   char *
   kmsan_strcpy(char *dst, const char *src)
   {
           const char *_src = src;
           char *_dst = dst;
           size_t len = 0;
   
           kmsan_check_arg(sizeof(dst) + sizeof(src), "strcpy():args");
   
           while (1) {
                   len++;
                   *dst = *src;
                   if (*src == '\0')
                           break;
                   src++, dst++;
           }
   
           kmsan_shadow_check(_src, len, "strcpy():arg2");
           kmsan_shadow_fill(_dst, KMSAN_STATE_INITED, len);
           kmsan_init_ret(sizeof(char *));
           return _dst;
   }
   
   int
   kmsan_strcmp(const char *s1, const char *s2)
   {
           const char *_s1 = s1, *_s2 = s2;
           size_t len = 0;
   
           kmsan_check_arg(sizeof(s1) + sizeof(s2), "strcmp():args");
           kmsan_init_ret(sizeof(int));
   
           while (1) {
                   len++;
                   if (*s1 != *s2)
                           break;
                   if (*s1 == '\0') {
                           kmsan_shadow_check(_s1, len, "strcmp():arg1");
                           kmsan_shadow_check(_s2, len, "strcmp():arg2");
                           return 0;
                   }
                   s1++, s2++;
           }
   
           kmsan_shadow_check(_s1, len, "strcmp():arg1");
           kmsan_shadow_check(_s2, len, "strcmp():arg2");
   
           return (*(const unsigned char *)s1 - *(const unsigned char *)s2);
   }
   
   size_t
   kmsan_strlen(const char *str)
   {
           const char *s;
   
           kmsan_check_arg(sizeof(str), "strlen():args");
   
           s = str;
           while (1) {
                   if (*s == '\0')
                           break;
                   s++;
           }
   
           kmsan_shadow_check(str, (size_t)(s - str) + 1, "strlen():arg1");
           kmsan_init_ret(sizeof(size_t));
           return (s - str);
   }
   
   char *
   kmsan_strcat(char *dst, const char *src)
   {
           size_t ldst, lsrc;
           char *ret;
   
           kmsan_check_arg(sizeof(dst) + sizeof(src), "strcat():args");
   
           ldst = __builtin_strlen(dst);
           lsrc = __builtin_strlen(src);
           kmsan_shadow_check(dst, ldst + 1, "strcat():arg1");
           kmsan_shadow_check(src, lsrc + 1, "strcat():arg2");
           ret = __builtin_strcat(dst, src);
           kmsan_shadow_fill(dst, KMSAN_STATE_INITED, ldst + lsrc + 1);
   
           kmsan_init_ret(sizeof(char *));
           return ret;
   }
   
   char *
   kmsan_strchr(const char *s, int c)
   {
           char *ret;
   
           kmsan_check_arg(sizeof(s) + sizeof(c), "strchr():args");
           kmsan_shadow_check(s, __builtin_strlen(s) + 1, "strchr():arg1");
           ret = __builtin_strchr(s, c);
   
           kmsan_init_ret(sizeof(char *));
           return ret;
   }
   
   char *
   kmsan_strrchr(const char *s, int c)
   {
           char *ret;
   
           kmsan_check_arg(sizeof(s) + sizeof(c), "strrchr():args");
           kmsan_shadow_check(s, __builtin_strlen(s) + 1, "strrchr():arg1");
           ret = __builtin_strrchr(s, c);
   
           kmsan_init_ret(sizeof(char *));
           return ret;
   }
   
   #undef kcopy
   #undef copyin
   #undef copyout
   #undef copyinstr
   #undef copyoutstr
   
   int     kmsan_kcopy(const void *, void *, size_t);
   int     kmsan_copyin(const void *, void *, size_t);
   int     kmsan_copyout(const void *, void *, size_t);
   int     kmsan_copyinstr(const void *, void *, size_t, size_t *);
   int     kmsan_copyoutstr(const void *, void *, size_t, size_t *);
   
   int     kcopy(const void *, void *, size_t);
   int     copyin(const void *, void *, size_t);
   int     copyout(const void *, void *, size_t);
   int     copyinstr(const void *, void *, size_t, size_t *);
   int     copyoutstr(const void *, void *, size_t, size_t *);
   
   int
   kmsan_kcopy(const void *src, void *dst, size_t len)
   {
           kmsan_check_arg(sizeof(src) + sizeof(dst) + sizeof(len),
               "kcopy():args");
           if (__predict_true(len != 0)) {
                   kmsan_meta_copy(dst, src, len);
           }
           kmsan_init_ret(sizeof(int));
           return kcopy(src, dst, len);
   }
   
   int
   kmsan_copyin(const void *uaddr, void *kaddr, size_t len)
   {
           int ret;
   
           kmsan_check_arg(sizeof(uaddr) + sizeof(kaddr) + sizeof(len),
               "copyin():args");
           ret = copyin(uaddr, kaddr, len);
           if (ret == 0)
                   kmsan_shadow_fill(kaddr, KMSAN_STATE_INITED, len);
           kmsan_init_ret(sizeof(int));
   
           return ret;
   }
   
   int
   kmsan_copyout(const void *kaddr, void *uaddr, size_t len)
   {
           kmsan_check_arg(sizeof(kaddr) + sizeof(uaddr) + sizeof(len),
               "copyout():args");
           kmsan_shadow_check(kaddr, len, "copyout():arg1");
           kmsan_init_ret(sizeof(int));
           return copyout(kaddr, uaddr, len);
   }
   
   int
   kmsan_copyinstr(const void *uaddr, void *kaddr, size_t len, size_t *done)
   {
           size_t _done;
           int ret;
   
           kmsan_check_arg(sizeof(uaddr) + sizeof(kaddr) +
               sizeof(len) + sizeof(done), "copyinstr():args");
           ret = copyinstr(uaddr, kaddr, len, &_done);
           if (ret == 0 || ret == ENAMETOOLONG)
                   kmsan_shadow_fill(kaddr, KMSAN_STATE_INITED, _done);
           if (done != NULL) {
                   *done = _done;
                   kmsan_shadow_fill(done, KMSAN_STATE_INITED, sizeof(size_t));
           }
           kmsan_init_ret(sizeof(int));
   
           return ret;
   }
   
   int
   kmsan_copyoutstr(const void *kaddr, void *uaddr, size_t len, size_t *done)
   {
           size_t _done;
           int ret;
   
           kmsan_check_arg(sizeof(kaddr) + sizeof(uaddr) +
               sizeof(len) + sizeof(done), "copyoutstr():args");
           ret = copyoutstr(kaddr, uaddr, len, &_done);
           kmsan_shadow_check(kaddr, _done, "copyoutstr():arg1");
           if (done != NULL) {
                   *done = _done;
                   kmsan_shadow_fill(done, KMSAN_STATE_INITED, sizeof(size_t));
           }
           kmsan_init_ret(sizeof(int));
   
           return ret;
   }
   
   /* -------------------------------------------------------------------------- */
   
   #undef _ucas_32
   #undef _ucas_32_mp
   #undef _ucas_64
   #undef _ucas_64_mp
   #undef _ufetch_8
   #undef _ufetch_16
   #undef _ufetch_32
   #undef _ufetch_64
   #undef _ustore_8
   #undef _ustore_16
   #undef _ustore_32
   #undef _ustore_64
   
   int _ucas_32(volatile uint32_t *, uint32_t, uint32_t, uint32_t *);
   int kmsan__ucas_32(volatile uint32_t *, uint32_t, uint32_t, uint32_t *);
   int
   kmsan__ucas_32(volatile uint32_t *uaddr, uint32_t old, uint32_t new,
       uint32_t *ret)
   {
           int _ret;
           kmsan_check_arg(sizeof(uaddr) + sizeof(old) +
               sizeof(new) + sizeof(ret), "ucas_32():args");
           _ret = _ucas_32(uaddr, old, new, ret);
           if (_ret == 0)
                   kmsan_shadow_fill(ret, KMSAN_STATE_INITED, sizeof(*ret));
           kmsan_init_ret(sizeof(int));
           return _ret;
   }
   
   #ifdef __HAVE_UCAS_MP
   int _ucas_32_mp(volatile uint32_t *, uint32_t, uint32_t, uint32_t *);
   int kmsan__ucas_32_mp(volatile uint32_t *, uint32_t, uint32_t, uint32_t *);
   int
   kmsan__ucas_32_mp(volatile uint32_t *uaddr, uint32_t old, uint32_t new,
       uint32_t *ret)
   {
           int _ret;
           kmsan_check_arg(sizeof(uaddr) + sizeof(old) +
               sizeof(new) + sizeof(ret), "ucas_32_mp():args");
           _ret = _ucas_32_mp(uaddr, old, new, ret);
           if (_ret == 0)
                   kmsan_shadow_fill(ret, KMSAN_STATE_INITED, sizeof(*ret));
           kmsan_init_ret(sizeof(int));
           return _ret;
   }
   #endif
   
   #ifdef _LP64
   int _ucas_64(volatile uint64_t *, uint64_t, uint64_t, uint64_t *);
   int kmsan__ucas_64(volatile uint64_t *, uint64_t, uint64_t, uint64_t *);
   int
   kmsan__ucas_64(volatile uint64_t *uaddr, uint64_t old, uint64_t new,
       uint64_t *ret)
   {
           int _ret;
           kmsan_check_arg(sizeof(uaddr) + sizeof(old) +
               sizeof(new) + sizeof(ret), "ucas_64():args");
           _ret = _ucas_64(uaddr, old, new, ret);
           if (_ret == 0)
                   kmsan_shadow_fill(ret, KMSAN_STATE_INITED, sizeof(*ret));
           kmsan_init_ret(sizeof(int));
           return _ret;
   }
   
   #ifdef __HAVE_UCAS_MP
   int _ucas_64_mp(volatile uint64_t *, uint64_t, uint64_t, uint64_t *);
   int kmsan__ucas_64_mp(volatile uint64_t *, uint64_t, uint64_t, uint64_t *);
   int
   kmsan__ucas_64_mp(volatile uint64_t *uaddr, uint64_t old, uint64_t new,
       uint64_t *ret)
   {
           int _ret;
           kmsan_check_arg(sizeof(uaddr) + sizeof(old) +
               sizeof(new) + sizeof(ret), "ucas_64_mp():args");
           _ret = _ucas_64_mp(uaddr, old, new, ret);
           if (_ret == 0)
                   kmsan_shadow_fill(ret, KMSAN_STATE_INITED, sizeof(*ret));
           kmsan_init_ret(sizeof(int));
           return _ret;
   }
   #endif
   #endif
   
   int _ufetch_8(const uint8_t *, uint8_t *);
   int kmsan__ufetch_8(const uint8_t *, uint8_t *);
   int
   kmsan__ufetch_8(const uint8_t *uaddr, uint8_t *valp)
   {
           int _ret;
           kmsan_check_arg(sizeof(uaddr) + sizeof(valp), "ufetch_8():args");
           _ret = _ufetch_8(uaddr, valp);
           if (_ret == 0)
                   kmsan_shadow_fill(valp, KMSAN_STATE_INITED, sizeof(*valp));
           kmsan_init_ret(sizeof(int));
           return _ret;
   }
   
   int _ufetch_16(const uint16_t *, uint16_t *);
   int kmsan__ufetch_16(const uint16_t *, uint16_t *);
   int
  kmsan__ufetch_16(const uint16_t *uaddr, uint16_t *valp)
  {
          int _ret;
          kmsan_check_arg(sizeof(uaddr) + sizeof(valp), "ufetch_16():args");
          _ret = _ufetch_16(uaddr, valp);
          if (_ret == 0)
                  kmsan_shadow_fill(valp, KMSAN_STATE_INITED, sizeof(*valp));
          kmsan_init_ret(sizeof(int));
          return _ret;
  }
  
  int _ufetch_32(const uint32_t *, uint32_t *);
  int kmsan__ufetch_32(const uint32_t *, uint32_t *);
  int
  kmsan__ufetch_32(const uint32_t *uaddr, uint32_t *valp)
  {
          int _ret;
          kmsan_check_arg(sizeof(uaddr) + sizeof(valp), "ufetch_32():args");
          _ret = _ufetch_32(uaddr, valp);
          if (_ret == 0)
                  kmsan_shadow_fill(valp, KMSAN_STATE_INITED, sizeof(*valp));
          kmsan_init_ret(sizeof(int));
          return _ret;
  }
  
  #ifdef _LP64
  int _ufetch_64(const uint64_t *, uint64_t *);
  int kmsan__ufetch_64(const uint64_t *, uint64_t *);
  int
  kmsan__ufetch_64(const uint64_t *uaddr, uint64_t *valp)
  {
          int _ret;
          kmsan_check_arg(sizeof(uaddr) + sizeof(valp), "ufetch_64():args");
          _ret = _ufetch_64(uaddr, valp);
          if (_ret == 0)
                  kmsan_shadow_fill(valp, KMSAN_STATE_INITED, sizeof(*valp));
          kmsan_init_ret(sizeof(int));
          return _ret;
  }
  #endif
  
  int _ustore_8(uint8_t *, uint8_t);
  int kmsan__ustore_8(uint8_t *, uint8_t);
  int
  kmsan__ustore_8(uint8_t *uaddr, uint8_t val)
  {
          kmsan_check_arg(sizeof(uaddr) + sizeof(val), "ustore_8():args");
          kmsan_init_ret(sizeof(int));
          return _ustore_8(uaddr, val);
  }
  
  int _ustore_16(uint16_t *, uint16_t);
  int kmsan__ustore_16(uint16_t *, uint16_t);
  int
  kmsan__ustore_16(uint16_t *uaddr, uint16_t val)
  {
          kmsan_check_arg(sizeof(uaddr) + sizeof(val), "ustore_16():args");
          kmsan_init_ret(sizeof(int));
          return _ustore_16(uaddr, val);
  }
  
  int _ustore_32(uint32_t *, uint32_t);
  int kmsan__ustore_32(uint32_t *, uint32_t);
  int
  kmsan__ustore_32(uint32_t *uaddr, uint32_t val)
  {
          kmsan_check_arg(sizeof(uaddr) + sizeof(val), "ustore_32():args");
          kmsan_init_ret(sizeof(int));
          return _ustore_32(uaddr, val);
  }
  
  #ifdef _LP64
  int _ustore_64(uint64_t *, uint64_t);
  int kmsan__ustore_64(uint64_t *, uint64_t);
  int
  kmsan__ustore_64(uint64_t *uaddr, uint64_t val)
  {
          kmsan_check_arg(sizeof(uaddr) + sizeof(val), "ustore_64():args");
          kmsan_init_ret(sizeof(int));
          return _ustore_64(uaddr, val);
  }
  #endif
  
  /* -------------------------------------------------------------------------- */
  
  #undef atomic_add_32
  #undef atomic_add_int
  #undef atomic_add_long
  #undef atomic_add_ptr
  #undef atomic_add_64
  #undef atomic_add_32_nv
  #undef atomic_add_int_nv
  #undef atomic_add_long_nv
  #undef atomic_add_ptr_nv
  #undef atomic_add_64_nv
  #undef atomic_and_32
  #undef atomic_and_uint
  #undef atomic_and_ulong
  #undef atomic_and_64
  #undef atomic_and_32_nv
  #undef atomic_and_uint_nv
  #undef atomic_and_ulong_nv
  #undef atomic_and_64_nv
  #undef atomic_or_32
  #undef atomic_or_uint
  #undef atomic_or_ulong
  #undef atomic_or_64
  #undef atomic_or_32_nv
  #undef atomic_or_uint_nv
  #undef atomic_or_ulong_nv
  #undef atomic_or_64_nv
  #undef atomic_cas_32
  #undef atomic_cas_uint
  #undef atomic_cas_ulong
  #undef atomic_cas_ptr
  #undef atomic_cas_64
  #undef atomic_cas_32_ni
  #undef atomic_cas_uint_ni
  #undef atomic_cas_ulong_ni
  #undef atomic_cas_ptr_ni
  #undef atomic_cas_64_ni
  #undef atomic_swap_32
  #undef atomic_swap_uint
  #undef atomic_swap_ulong
  #undef atomic_swap_ptr
  #undef atomic_swap_64
  #undef atomic_dec_32
  #undef atomic_dec_uint
  #undef atomic_dec_ulong
  #undef atomic_dec_ptr
  #undef atomic_dec_64
  #undef atomic_dec_32_nv
  #undef atomic_dec_uint_nv
  #undef atomic_dec_ulong_nv
  #undef atomic_dec_ptr_nv
  #undef atomic_dec_64_nv
  #undef atomic_inc_32
  #undef atomic_inc_uint
  #undef atomic_inc_ulong
  #undef atomic_inc_ptr
  #undef atomic_inc_64
  #undef atomic_inc_32_nv
  #undef atomic_inc_uint_nv
  #undef atomic_inc_ulong_nv
  #undef atomic_inc_ptr_nv
  #undef atomic_inc_64_nv
  
  #define MSAN_ATOMIC_FUNC_ADD(name, tret, targ1, targ2) \
          void atomic_add_##name(volatile targ1 *, targ2); \
          void kmsan_atomic_add_##name(volatile targ1 *, targ2); \
          void kmsan_atomic_add_##name(volatile targ1 *ptr, targ2 val) \
          { \
                  kmsan_check_arg(sizeof(ptr) + sizeof(val), \
                      "atomic_add_" #name "():args"); \
                  kmsan_shadow_check((const void *)(uintptr_t)ptr, sizeof(tret), \
                      "atomic_add_" #name "():arg1"); \
                  atomic_add_##name(ptr, val); \
          } \
          tret atomic_add_##name##_nv(volatile targ1 *, targ2); \
          tret kmsan_atomic_add_##name##_nv(volatile targ1 *, targ2); \
          tret kmsan_atomic_add_##name##_nv(volatile targ1 *ptr, targ2 val) \
          { \
                  kmsan_check_arg(sizeof(ptr) + sizeof(val), \
                      "atomic_add_" #name "_nv():args"); \
                  kmsan_shadow_check((const void *)(uintptr_t)ptr, sizeof(tret), \
                      "atomic_add_" #name "_nv():arg1"); \
                  kmsan_init_ret(sizeof(tret)); \
                  return atomic_add_##name##_nv(ptr, val); \
          }
  
  #define MSAN_ATOMIC_FUNC_AND(name, tret, targ1, targ2) \
          void atomic_and_##name(volatile targ1 *, targ2); \
          void kmsan_atomic_and_##name(volatile targ1 *, targ2); \
          void kmsan_atomic_and_##name(volatile targ1 *ptr, targ2 val) \
          { \
                  kmsan_check_arg(sizeof(ptr) + sizeof(val), \
                      "atomic_and_" #name "():args"); \
                  kmsan_shadow_check((const void *)(uintptr_t)ptr, sizeof(tret), \
                      "atomic_and_" #name "():arg1"); \
                  atomic_and_##name(ptr, val); \
          } \
          tret atomic_and_##name##_nv(volatile targ1 *, targ2); \
          tret kmsan_atomic_and_##name##_nv(volatile targ1 *, targ2); \
          tret kmsan_atomic_and_##name##_nv(volatile targ1 *ptr, targ2 val) \
          { \
                  kmsan_check_arg(sizeof(ptr) + sizeof(val), \
                      "atomic_and_" #name "_nv():args"); \
                  kmsan_shadow_check((const void *)(uintptr_t)ptr, sizeof(tret), \
                      "atomic_and_" #name "_nv():arg1"); \
                  kmsan_init_ret(sizeof(tret)); \
                  return atomic_and_##name##_nv(ptr, val); \
          }
  
  #define MSAN_ATOMIC_FUNC_OR(name, tret, targ1, targ2) \
          void atomic_or_##name(volatile targ1 *, targ2); \
          void kmsan_atomic_or_##name(volatile targ1 *, targ2); \
          void kmsan_atomic_or_##name(volatile targ1 *ptr, targ2 val) \
          { \
                  kmsan_check_arg(sizeof(ptr) + sizeof(val), \
                      "atomic_or_" #name "():args"); \
                  kmsan_shadow_check((const void *)(uintptr_t)ptr, sizeof(tret), \
                      "atomic_or_" #name "():arg1"); \
                  atomic_or_##name(ptr, val); \
          } \
          tret atomic_or_##name##_nv(volatile targ1 *, targ2); \
          tret kmsan_atomic_or_##name##_nv(volatile targ1 *, targ2); \
          tret kmsan_atomic_or_##name##_nv(volatile targ1 *ptr, targ2 val) \
          { \
                  kmsan_check_arg(sizeof(ptr) + sizeof(val), \
                      "atomic_or_" #name "_nv():args"); \
                  kmsan_shadow_check((const void *)(uintptr_t)ptr, sizeof(tret), \
                      "atomic_or_" #name "_nv():arg1"); \
                  kmsan_init_ret(sizeof(tret)); \
                  return atomic_or_##name##_nv(ptr, val); \
          }
  
  #define MSAN_ATOMIC_FUNC_CAS(name, tret, targ1, targ2) \
          tret atomic_cas_##name(volatile targ1 *, targ2, targ2); \
          tret kmsan_atomic_cas_##name(volatile targ1 *, targ2, targ2); \
          tret kmsan_atomic_cas_##name(volatile targ1 *ptr, targ2 exp, targ2 new) \
          { \
                  kmsan_check_arg(sizeof(ptr) + sizeof(exp) + sizeof(new), \
                      "atomic_cas_" #name "():args"); \
                  kmsan_shadow_check((const void *)(uintptr_t)ptr, sizeof(tret), \
                      "atomic_cas_" #name "():arg1"); \
                  kmsan_init_ret(sizeof(tret)); \
                  return atomic_cas_##name(ptr, exp, new); \
          } \
          tret atomic_cas_##name##_ni(volatile targ1 *, targ2, targ2); \
          tret kmsan_atomic_cas_##name##_ni(volatile targ1 *, targ2, targ2); \
          tret kmsan_atomic_cas_##name##_ni(volatile targ1 *ptr, targ2 exp, targ2 new) \
          { \
                  kmsan_check_arg(sizeof(ptr) + sizeof(exp) + sizeof(new), \
                      "atomic_cas_" #name "_ni():args"); \
                  kmsan_shadow_check((const void *)(uintptr_t)ptr, sizeof(tret), \
                      "atomic_cas_" #name "_ni():arg1"); \
                  kmsan_init_ret(sizeof(tret)); \
                  return atomic_cas_##name##_ni(ptr, exp, new); \
          }
  
  #define MSAN_ATOMIC_FUNC_SWAP(name, tret, targ1, targ2) \
          tret atomic_swap_##name(volatile targ1 *, targ2); \
          tret kmsan_atomic_swap_##name(volatile targ1 *, targ2); \
          tret kmsan_atomic_swap_##name(volatile targ1 *ptr, targ2 val) \
          { \
                  kmsan_check_arg(sizeof(ptr) + sizeof(val), \
                      "atomic_swap_" #name "():args"); \
                  kmsan_shadow_check((const void *)(uintptr_t)ptr, sizeof(tret), \
                      "atomic_swap_" #name "():arg1"); \
                  kmsan_init_ret(sizeof(tret)); \
                  return atomic_swap_##name(ptr, val); \
          }
  
  #define MSAN_ATOMIC_FUNC_DEC(name, tret, targ1) \
          void atomic_dec_##name(volatile targ1 *); \
          void kmsan_atomic_dec_##name(volatile targ1 *); \
          void kmsan_atomic_dec_##name(volatile targ1 *ptr) \
          { \
                  kmsan_check_arg(sizeof(ptr), \
                      "atomic_dec_" #name "():args"); \
                  kmsan_shadow_check((const void *)(uintptr_t)ptr, sizeof(tret), \
                      "atomic_dec_" #name "():arg1"); \
                  atomic_dec_##name(ptr); \
          } \
          tret atomic_dec_##name##_nv(volatile targ1 *); \
          tret kmsan_atomic_dec_##name##_nv(volatile targ1 *); \
          tret kmsan_atomic_dec_##name##_nv(volatile targ1 *ptr) \
          { \
                  kmsan_check_arg(sizeof(ptr), \
                      "atomic_dec_" #name "_nv():args"); \
                  kmsan_shadow_check((const void *)(uintptr_t)ptr, sizeof(tret), \
                      "atomic_dec_" #name "_nv():arg1"); \
                  kmsan_init_ret(sizeof(tret)); \
                  return atomic_dec_##name##_nv(ptr); \
          }
  
  #define MSAN_ATOMIC_FUNC_INC(name, tret, targ1) \
          void atomic_inc_##name(volatile targ1 *); \
          void kmsan_atomic_inc_##name(volatile targ1 *); \
          void kmsan_atomic_inc_##name(volatile targ1 *ptr) \
          { \
                  kmsan_check_arg(sizeof(ptr), \
                      "atomic_inc_" #name "():args"); \
                  kmsan_shadow_check((const void *)(uintptr_t)ptr, sizeof(tret), \
                      "atomic_inc_" #name "():arg1"); \
                  atomic_inc_##name(ptr); \
          } \
          tret atomic_inc_##name##_nv(volatile targ1 *); \
          tret kmsan_atomic_inc_##name##_nv(volatile targ1 *); \
          tret kmsan_atomic_inc_##name##_nv(volatile targ1 *ptr) \
          { \
                  kmsan_check_arg(sizeof(ptr), \
                      "atomic_inc_" #name "_nv():args"); \
                  kmsan_shadow_check((const void *)(uintptr_t)ptr, sizeof(tret), \
                      "atomic_inc_" #name "_nv():arg1"); \
                  kmsan_init_ret(sizeof(tret)); \
                  return atomic_inc_##name##_nv(ptr); \
          }
  
  MSAN_ATOMIC_FUNC_ADD(32, uint32_t, uint32_t, int32_t);
  MSAN_ATOMIC_FUNC_ADD(64, uint64_t, uint64_t, int64_t);
  MSAN_ATOMIC_FUNC_ADD(int, unsigned int, unsigned int, int);
  MSAN_ATOMIC_FUNC_ADD(long, unsigned long, unsigned long, long);
  MSAN_ATOMIC_FUNC_ADD(ptr, void *, void, ssize_t);
  
  MSAN_ATOMIC_FUNC_AND(32, uint32_t, uint32_t, uint32_t);
  MSAN_ATOMIC_FUNC_AND(64, uint64_t, uint64_t, uint64_t);
  MSAN_ATOMIC_FUNC_AND(uint, unsigned int, unsigned int, unsigned int);
  MSAN_ATOMIC_FUNC_AND(ulong, unsigned long, unsigned long, unsigned long);
  
  MSAN_ATOMIC_FUNC_OR(32, uint32_t, uint32_t, uint32_t);
  MSAN_ATOMIC_FUNC_OR(64, uint64_t, uint64_t, uint64_t);
  MSAN_ATOMIC_FUNC_OR(uint, unsigned int, unsigned int, unsigned int);
  MSAN_ATOMIC_FUNC_OR(ulong, unsigned long, unsigned long, unsigned long);
  
  MSAN_ATOMIC_FUNC_CAS(32, uint32_t, uint32_t, uint32_t);
  MSAN_ATOMIC_FUNC_CAS(64, uint64_t, uint64_t, uint64_t);
  MSAN_ATOMIC_FUNC_CAS(uint, unsigned int, unsigned int, unsigned int);
  MSAN_ATOMIC_FUNC_CAS(ulong, unsigned long, unsigned long, unsigned long);
  MSAN_ATOMIC_FUNC_CAS(ptr, void *, void, void *);
  
  MSAN_ATOMIC_FUNC_SWAP(32, uint32_t, uint32_t, uint32_t);
  MSAN_ATOMIC_FUNC_SWAP(64, uint64_t, uint64_t, uint64_t);
  MSAN_ATOMIC_FUNC_SWAP(uint, unsigned int, unsigned int, unsigned int);
  MSAN_ATOMIC_FUNC_SWAP(ulong, unsigned long, unsigned long, unsigned long);
  MSAN_ATOMIC_FUNC_SWAP(ptr, void *, void, void *);
  
  MSAN_ATOMIC_FUNC_DEC(32, uint32_t, uint32_t)
  MSAN_ATOMIC_FUNC_DEC(64, uint64_t, uint64_t)
  MSAN_ATOMIC_FUNC_DEC(uint, unsigned int, unsigned int);
  MSAN_ATOMIC_FUNC_DEC(ulong, unsigned long, unsigned long);
  MSAN_ATOMIC_FUNC_DEC(ptr, void *, void);
  
  MSAN_ATOMIC_FUNC_INC(32, uint32_t, uint32_t)
  MSAN_ATOMIC_FUNC_INC(64, uint64_t, uint64_t)
  MSAN_ATOMIC_FUNC_INC(uint, unsigned int, unsigned int);
  MSAN_ATOMIC_FUNC_INC(ulong, unsigned long, unsigned long);
  MSAN_ATOMIC_FUNC_INC(ptr, void *, void);
  
  /* -------------------------------------------------------------------------- */
  
  #include <sys/bus.h>
  
  #undef bus_space_read_multi_1
  #undef bus_space_read_multi_2
  #undef bus_space_read_multi_4
  #undef bus_space_read_multi_8
  #undef bus_space_read_multi_stream_1
  #undef bus_space_read_multi_stream_2
  #undef bus_space_read_multi_stream_4
  #undef bus_space_read_multi_stream_8
  #undef bus_space_read_region_1
  #undef bus_space_read_region_2
  #undef bus_space_read_region_4
  #undef bus_space_read_region_8
  #undef bus_space_read_region_stream_1
  #undef bus_space_read_region_stream_2
  #undef bus_space_read_region_stream_4
  #undef bus_space_read_region_stream_8
  
  #define MSAN_BUS_READ_FUNC(bytes, bits) \
          void bus_space_read_multi_##bytes(bus_space_tag_t, bus_space_handle_t,  \
              bus_size_t, uint##bits##_t *, bus_size_t);                          \
          void kmsan_bus_space_read_multi_##bytes(bus_space_tag_t,                \
              bus_space_handle_t, bus_size_t, uint##bits##_t *, bus_size_t);      \
          void kmsan_bus_space_read_multi_##bytes(bus_space_tag_t tag,            \
              bus_space_handle_t hnd, bus_size_t size, uint##bits##_t *buf,       \
              bus_size_t count)                                                   \
          {                                                                       \
                  kmsan_shadow_fill(buf, KMSAN_STATE_INITED,                      \
                      sizeof(uint##bits##_t) * count);                            \
                  bus_space_read_multi_##bytes(tag, hnd, size, buf, count);       \
          }                                                                       \
          void bus_space_read_multi_stream_##bytes(bus_space_tag_t,               \
              bus_space_handle_t, bus_size_t, uint##bits##_t *, bus_size_t);      \
          void kmsan_bus_space_read_multi_stream_##bytes(bus_space_tag_t,         \
              bus_space_handle_t, bus_size_t, uint##bits##_t *, bus_size_t);      \
          void kmsan_bus_space_read_multi_stream_##bytes(bus_space_tag_t tag,     \
              bus_space_handle_t hnd, bus_size_t size, uint##bits##_t *buf,       \
              bus_size_t count)                                                   \
          {                                                                       \
                  kmsan_shadow_fill(buf, KMSAN_STATE_INITED,                      \
                      sizeof(uint##bits##_t) * count);                            \
                  bus_space_read_multi_stream_##bytes(tag, hnd, size, buf, count);\
          }                                                                       \
          void bus_space_read_region_##bytes(bus_space_tag_t, bus_space_handle_t, \
              bus_size_t, uint##bits##_t *, bus_size_t);                          \
          void kmsan_bus_space_read_region_##bytes(bus_space_tag_t,               \
              bus_space_handle_t, bus_size_t, uint##bits##_t *, bus_size_t);      \
          void kmsan_bus_space_read_region_##bytes(bus_space_tag_t tag,           \
              bus_space_handle_t hnd, bus_size_t size, uint##bits##_t *buf,       \
              bus_size_t count)                                                   \
          {                                                                       \
                  kmsan_shadow_fill(buf, KMSAN_STATE_INITED,                      \
                      sizeof(uint##bits##_t) * count);                            \
                  bus_space_read_region_##bytes(tag, hnd, size, buf, count);      \
          }                                                                       \
          void bus_space_read_region_stream_##bytes(bus_space_tag_t,              \
              bus_space_handle_t, bus_size_t, uint##bits##_t *, bus_size_t);      \
          void kmsan_bus_space_read_region_stream_##bytes(bus_space_tag_t,        \
              bus_space_handle_t, bus_size_t, uint##bits##_t *, bus_size_t);      \
          void kmsan_bus_space_read_region_stream_##bytes(bus_space_tag_t tag,    \
              bus_space_handle_t hnd, bus_size_t size, uint##bits##_t *buf,       \
              bus_size_t count)                                                   \
          {                                                                       \
                  kmsan_shadow_fill(buf, KMSAN_STATE_INITED,                      \
                      sizeof(uint##bits##_t) * count);                            \
                  bus_space_read_region_stream_##bytes(tag, hnd, size, buf, count);\
          }
  
  MSAN_BUS_READ_FUNC(1, 8)
  MSAN_BUS_READ_FUNC(2, 16)
  MSAN_BUS_READ_FUNC(4, 32)
  MSAN_BUS_READ_FUNC(8, 64)
  
  #undef bus_space_write_multi_1
  #undef bus_space_write_multi_2
  #undef bus_space_write_multi_4
  #undef bus_space_write_multi_8
  #undef bus_space_write_multi_stream_1
  #undef bus_space_write_multi_stream_2
  #undef bus_space_write_multi_stream_4
  #undef bus_space_write_multi_stream_8
  #undef bus_space_write_region_1
  #undef bus_space_write_region_2
  #undef bus_space_write_region_4
  #undef bus_space_write_region_8
  #undef bus_space_write_region_stream_1
  #undef bus_space_write_region_stream_2
  #undef bus_space_write_region_stream_4
  #undef bus_space_write_region_stream_8
  
  #define MSAN_BUS_WRITE_FUNC(bytes, bits) \
          void bus_space_write_multi_##bytes(bus_space_tag_t, bus_space_handle_t, \
              bus_size_t, const uint##bits##_t *, bus_size_t);                    \
          void kmsan_bus_space_write_multi_##bytes(bus_space_tag_t,               \
              bus_space_handle_t, bus_size_t, const uint##bits##_t *, bus_size_t);\
          void kmsan_bus_space_write_multi_##bytes(bus_space_tag_t tag,           \
              bus_space_handle_t hnd, bus_size_t size, const uint##bits##_t *buf, \
              bus_size_t count)                                                   \
          {                                                                       \
                  kmsan_shadow_check(buf, sizeof(uint##bits##_t) * count,         \
                      "bus_space_write()");                                       \
                  bus_space_write_multi_##bytes(tag, hnd, size, buf, count);      \
          }                                                                       \
          void bus_space_write_multi_stream_##bytes(bus_space_tag_t,              \
              bus_space_handle_t, bus_size_t, const uint##bits##_t *, bus_size_t);\
          void kmsan_bus_space_write_multi_stream_##bytes(bus_space_tag_t,        \
              bus_space_handle_t, bus_size_t, const uint##bits##_t *, bus_size_t);\
          void kmsan_bus_space_write_multi_stream_##bytes(bus_space_tag_t tag,    \
              bus_space_handle_t hnd, bus_size_t size, const uint##bits##_t *buf, \
              bus_size_t count)                                                   \
          {                                                                       \
                  kmsan_shadow_check(buf, sizeof(uint##bits##_t) * count,         \
                      "bus_space_write()");                                       \
                  bus_space_write_multi_stream_##bytes(tag, hnd, size, buf, count);\
          }                                                                       \
          void bus_space_write_region_##bytes(bus_space_tag_t, bus_space_handle_t,\
              bus_size_t, const uint##bits##_t *, bus_size_t);                    \
          void kmsan_bus_space_write_region_##bytes(bus_space_tag_t,              \
              bus_space_handle_t, bus_size_t, const uint##bits##_t *, bus_size_t);\
          void kmsan_bus_space_write_region_##bytes(bus_space_tag_t tag,          \
              bus_space_handle_t hnd, bus_size_t size, const uint##bits##_t *buf, \
              bus_size_t count)                                                   \
          {                                                                       \
                  kmsan_shadow_check(buf, sizeof(uint##bits##_t) * count,         \
                      "bus_space_write()");                                       \
                  bus_space_write_region_##bytes(tag, hnd, size, buf, count);     \
          }                                                                       \
          void bus_space_write_region_stream_##bytes(bus_space_tag_t,             \
              bus_space_handle_t, bus_size_t, const uint##bits##_t *, bus_size_t);\
          void kmsan_bus_space_write_region_stream_##bytes(bus_space_tag_t,       \
              bus_space_handle_t, bus_size_t, const uint##bits##_t *, bus_size_t);\
          void kmsan_bus_space_write_region_stream_##bytes(bus_space_tag_t tag,   \
              bus_space_handle_t hnd, bus_size_t size, const uint##bits##_t *buf, \
              bus_size_t count)                                                   \
          {                                                                       \
                  kmsan_shadow_check(buf, sizeof(uint##bits##_t) * count,         \
                      "bus_space_write()");                                       \
                  bus_space_write_region_stream_##bytes(tag, hnd, size, buf, count);\
          }
  
  MSAN_BUS_WRITE_FUNC(1, 8)
  MSAN_BUS_WRITE_FUNC(2, 16)
  MSAN_BUS_WRITE_FUNC(4, 32)
  MSAN_BUS_WRITE_FUNC(8, 64)
  
  /* -------------------------------------------------------------------------- */
  
  #include <sys/mbuf.h>
  
  static void
  kmsan_dma_sync_linear(uint8_t *buf, bus_addr_t offset, bus_size_t len,
      bool init, uintptr_t pc)
  {
          if (init) {
                  kmsan_shadow_fill(buf + offset, KMSAN_STATE_INITED, len);
          } else {
                  kmsan_shadow_check(buf + offset, len, "LinearDmaSyncOp");
          }
  }
  
  static void
  kmsan_dma_sync_mbuf(struct mbuf *m, bus_addr_t offset, bus_size_t len,
      bool init, uintptr_t pc)
  {
          bus_addr_t minlen;
  
          for (; m != NULL && len != 0; m = m->m_next) {
                  if (offset >= m->m_len) {
                          offset -= m->m_len;
                          continue;
                  }
  
                  minlen = MIN(len, m->m_len - offset);
  
                  if (init) {
                          kmsan_shadow_fill(mtod(m, char *) + offset,
                              KMSAN_STATE_INITED, minlen);
                  } else {
                          kmsan_shadow_check(mtod(m, char *) + offset,
                              minlen, "MbufDmaSyncOp");
                  }
  
                  offset = 0;
                  len -= minlen;
          }
  }
  
  static void
  kmsan_dma_sync_uio(struct uio *uio, bus_addr_t offset, bus_size_t len,
      bool init, uintptr_t pc)
  {
          bus_size_t minlen, resid;
          struct iovec *iov;
          int i;
  
          if (!VMSPACE_IS_KERNEL_P(uio->uio_vmspace))
                  return;
  
          resid = uio->uio_resid;
          iov = uio->uio_iov;
  
          for (i = 0; i < uio->uio_iovcnt && resid != 0; i++) {
                  minlen = MIN(resid, iov[i].iov_len);
  
                  if (init) {
                          kmsan_shadow_fill(iov[i].iov_base,
                              KMSAN_STATE_INITED, minlen);
                  } else {
                          kmsan_shadow_check(iov[i].iov_base, minlen,
                              "UioDmaSyncOp");
                  }
  
                  resid -= minlen;
          }
  }
  
  void
  kmsan_dma_sync(bus_dmamap_t map, bus_addr_t offset, bus_size_t len, int ops)
  {
          bool init;
  
          if ((ops & (BUS_DMASYNC_PREWRITE|BUS_DMASYNC_POSTREAD)) == 0)
                  return;
          init = (ops & BUS_DMASYNC_POSTREAD) != 0;
  
          switch (map->dm_buftype) {
          case KMSAN_DMA_LINEAR:
                  kmsan_dma_sync_linear(map->dm_buf, offset, len, init,
                      __RET_ADDR);
                  break;
          case KMSAN_DMA_MBUF:
                  kmsan_dma_sync_mbuf(map->dm_buf, offset, len, init,
                      __RET_ADDR);
                  break;
          case KMSAN_DMA_UIO:
                  kmsan_dma_sync_uio(map->dm_buf, offset, len, init,
                      __RET_ADDR);
                  break;
          case KMSAN_DMA_RAW:
                  break;
          default:
                  panic("%s: impossible", __func__);
          }
  }
  
  void
  kmsan_dma_load(bus_dmamap_t map, void *buf, bus_size_t buflen, int type)
  {
          map->dm_buf = buf;
          map->dm_buflen = buflen;
          map->dm_buftype = type;
  }

Cache object: c45fba1b99f7a80bef1d3361ed836f71