linux_elf.c

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    1 /*-
    2  * SPDX-License-Identifier: BSD-3-Clause
    3  *
    4  * Copyright (c) 2021 Edward Tomasz Napierala <trasz@FreeBSD.org>
    5  * Copyright (c) 2018 Chuck Tuffli
    6  * Copyright (c) 2017 Dell EMC
    7  * Copyright (c) 2000 David O'Brien
    8  * Copyright (c) 1995-1996 Søren Schmidt
    9  * Copyright (c) 1996 Peter Wemm
   10  * All rights reserved.
   11  *
   12  * This software was developed by the University of Cambridge Computer
   13  * Laboratory as part of the CHERI for Hypervisors and Operating Systems
   14  * (CHaOS) project, funded by EPSRC grant EP/V000292/1.
   15  *
   16  * Redistribution and use in source and binary forms, with or without
   17  * modification, are permitted provided that the following conditions
   18  * are met:
   19  * 1. Redistributions of source code must retain the above copyright
   20  *    notice, this list of conditions and the following disclaimer
   21  *    in this position and unchanged.
   22  * 2. Redistributions in binary form must reproduce the above copyright
   23  *    notice, this list of conditions and the following disclaimer in the
   24  *    documentation and/or other materials provided with the distribution.
   25  * 3. The name of the author may not be used to endorse or promote products
   26  *    derived from this software without specific prior written permission
   27  *
   28  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
   29  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
   30  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
   31  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
   32  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
   33  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
   34  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
   35  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
   36  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
   37  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
   38  */
   39 
   40 #include <sys/cdefs.h>
   41 __FBSDID("$FreeBSD$");
   42 
   43 #include <sys/param.h>
   44 #include <sys/imgact.h>
   45 #include <sys/imgact_elf.h>
   46 #include <sys/lock.h>
   47 #include <sys/malloc.h>
   48 #include <sys/mutex.h>
   49 #include <sys/proc.h>
   50 #include <sys/procfs.h>
   51 #include <sys/reg.h>
   52 #include <sys/sbuf.h>
   53 
   54 #include <machine/elf.h>
   55 
   56 #if __ELF_WORD_SIZE == 32
   57 #define linux_pt_regset linux_pt_regset32
   58 #define bsd_to_linux_regset bsd_to_linux_regset32
   59 #include <machine/../linux32/linux.h>
   60 #else
   61 #include <machine/../linux/linux.h>
   62 #endif
   63 #include <compat/linux/linux_elf.h>
   64 #include <compat/linux/linux_emul.h>
   65 #include <compat/linux/linux_misc.h>
   66 
   67 /* This adds "linux32_" and "linux64_" prefixes. */
   68 #define __linuxN(x)     __CONCAT(__CONCAT(__CONCAT(linux,__ELF_WORD_SIZE),_),x)
   69 
   70 #define LINUX_NT_AUXV   6
   71 
   72 static void __linuxN(note_fpregset)(void *, struct sbuf *, size_t *);
   73 static void __linuxN(note_prpsinfo)(void *, struct sbuf *, size_t *);
   74 static void __linuxN(note_prstatus)(void *, struct sbuf *, size_t *);
   75 static void __linuxN(note_threadmd)(void *, struct sbuf *, size_t *);
   76 static void __linuxN(note_nt_auxv)(void *, struct sbuf *, size_t *);
   77 
   78 void
   79 __linuxN(prepare_notes)(struct thread *td, struct note_info_list *list,
   80     size_t *sizep)
   81 {
   82         struct proc *p;
   83         struct thread *thr;
   84         size_t size;
   85 
   86         p = td->td_proc;
   87         size = 0;
   88 
   89         /*
   90          * To have the debugger select the right thread (LWP) as the initial
   91          * thread, we dump the state of the thread passed to us in td first.
   92          * This is the thread that causes the core dump and thus likely to
   93          * be the right thread one wants to have selected in the debugger.
   94          */
   95         thr = td;
   96         while (thr != NULL) {
   97                 size += __elfN(register_note)(td, list,
   98                     NT_PRSTATUS, __linuxN(note_prstatus), thr);
   99                 size += __elfN(register_note)(td, list,
  100                     NT_PRPSINFO, __linuxN(note_prpsinfo), p);
  101                 size += __elfN(register_note)(td, list,
  102                     LINUX_NT_AUXV, __linuxN(note_nt_auxv), p);
  103                 size += __elfN(register_note)(td, list,
  104                     NT_FPREGSET, __linuxN(note_fpregset), thr);
  105                 size += __elfN(register_note)(td, list,
  106                     -1, __linuxN(note_threadmd), thr);
  107 
  108                 thr = thr == td ? TAILQ_FIRST(&p->p_threads) :
  109                     TAILQ_NEXT(thr, td_plist);
  110                 if (thr == td)
  111                         thr = TAILQ_NEXT(thr, td_plist);
  112         }
  113 
  114         *sizep = size;
  115 }
  116 
  117 typedef struct linux_elf_prstatus linux_elf_prstatus_t;
  118 #if __ELF_WORD_SIZE == 32
  119 typedef struct prpsinfo32 linux_elf_prpsinfo_t;
  120 typedef struct fpreg32 linux_elf_prfpregset_t;
  121 #else
  122 typedef prpsinfo_t linux_elf_prpsinfo_t;
  123 typedef prfpregset_t linux_elf_prfpregset_t;
  124 #endif
  125 
  126 static void
  127 __linuxN(note_prpsinfo)(void *arg, struct sbuf *sb, size_t *sizep)
  128 {
  129         struct sbuf sbarg;
  130         size_t len;
  131         char *cp, *end;
  132         struct proc *p;
  133         linux_elf_prpsinfo_t *psinfo;
  134         int error;
  135 
  136         p = arg;
  137         if (sb != NULL) {
  138                 KASSERT(*sizep == sizeof(*psinfo), ("invalid size"));
  139                 psinfo = malloc(sizeof(*psinfo), M_TEMP, M_ZERO | M_WAITOK);
  140                 psinfo->pr_version = PRPSINFO_VERSION;
  141                 psinfo->pr_psinfosz = sizeof(linux_elf_prpsinfo_t);
  142                 strlcpy(psinfo->pr_fname, p->p_comm, sizeof(psinfo->pr_fname));
  143                 PROC_LOCK(p);
  144                 if (p->p_args != NULL) {
  145                         len = sizeof(psinfo->pr_psargs) - 1;
  146                         if (len > p->p_args->ar_length)
  147                                 len = p->p_args->ar_length;
  148                         memcpy(psinfo->pr_psargs, p->p_args->ar_args, len);
  149                         PROC_UNLOCK(p);
  150                         error = 0;
  151                 } else {
  152                         _PHOLD(p);
  153                         PROC_UNLOCK(p);
  154                         sbuf_new(&sbarg, psinfo->pr_psargs,
  155                             sizeof(psinfo->pr_psargs), SBUF_FIXEDLEN);
  156                         error = proc_getargv(curthread, p, &sbarg);
  157                         PRELE(p);
  158                         if (sbuf_finish(&sbarg) == 0) {
  159                                 len = sbuf_len(&sbarg) - 1;
  160                                 if (len > 0)
  161                                         len--;
  162                         } else {
  163                                 len = sizeof(psinfo->pr_psargs) - 1;
  164                         }
  165                         sbuf_delete(&sbarg);
  166                 }
  167                 if (error != 0 || len == 0 || (ssize_t)len == -1)
  168                         strlcpy(psinfo->pr_psargs, p->p_comm,
  169                             sizeof(psinfo->pr_psargs));
  170                 else {
  171                         KASSERT(len < sizeof(psinfo->pr_psargs),
  172                             ("len is too long: %zu vs %zu", len,
  173                             sizeof(psinfo->pr_psargs)));
  174                         cp = psinfo->pr_psargs;
  175                         end = cp + len - 1;
  176                         for (;;) {
  177                                 cp = memchr(cp, '\0', end - cp);
  178                                 if (cp == NULL)
  179                                         break;
  180                                 *cp = ' ';
  181                         }
  182                 }
  183                 psinfo->pr_pid = p->p_pid;
  184                 sbuf_bcat(sb, psinfo, sizeof(*psinfo));
  185                 free(psinfo, M_TEMP);
  186         }
  187         *sizep = sizeof(*psinfo);
  188 }
  189 
  190 static void
  191 __linuxN(note_prstatus)(void *arg, struct sbuf *sb, size_t *sizep)
  192 {
  193         struct thread *td;
  194         linux_elf_prstatus_t *status;
  195 #if __ELF_WORD_SIZE == 32
  196         struct reg32 pr_reg;
  197 #else
  198         struct reg pr_reg;
  199 #endif
  200 
  201         td = arg;
  202         if (sb != NULL) {
  203                 KASSERT(*sizep == sizeof(*status), ("invalid size"));
  204                 status = malloc(sizeof(*status), M_TEMP, M_ZERO | M_WAITOK);
  205 
  206                 /*
  207                  * XXX: Some fields missing.
  208                  */
  209                 status->pr_cursig = td->td_proc->p_sig;
  210                 status->pr_pid = td->td_tid;
  211 
  212 #if __ELF_WORD_SIZE == 32
  213                 fill_regs32(td, &pr_reg);
  214 #else
  215                 fill_regs(td, &pr_reg);
  216 #endif
  217                 bsd_to_linux_regset(&pr_reg, &status->pr_reg);
  218                 sbuf_bcat(sb, status, sizeof(*status));
  219                 free(status, M_TEMP);
  220         }
  221         *sizep = sizeof(*status);
  222 }
  223 
  224 static void
  225 __linuxN(note_fpregset)(void *arg, struct sbuf *sb, size_t *sizep)
  226 {
  227         struct thread *td;
  228         linux_elf_prfpregset_t *fpregset;
  229 
  230         td = arg;
  231         if (sb != NULL) {
  232                 KASSERT(*sizep == sizeof(*fpregset), ("invalid size"));
  233                 fpregset = malloc(sizeof(*fpregset), M_TEMP, M_ZERO | M_WAITOK);
  234 #if __ELF_WORD_SIZE == 32
  235                 fill_fpregs32(td, fpregset);
  236 #else
  237                 fill_fpregs(td, fpregset);
  238 #endif
  239                 sbuf_bcat(sb, fpregset, sizeof(*fpregset));
  240                 free(fpregset, M_TEMP);
  241         }
  242         *sizep = sizeof(*fpregset);
  243 }
  244 
  245 /*
  246  * Allow for MD specific notes, as well as any MD
  247  * specific preparations for writing MI notes.
  248  */
  249 static void
  250 __linuxN(note_threadmd)(void *arg, struct sbuf *sb, size_t *sizep)
  251 {
  252         struct thread *td;
  253         void *buf;
  254         size_t size;
  255 
  256         td = arg;
  257         size = *sizep;
  258         if (size != 0 && sb != NULL)
  259                 buf = malloc(size, M_TEMP, M_ZERO | M_WAITOK);
  260         else
  261                 buf = NULL;
  262         size = 0;
  263         __elfN(dump_thread)(td, buf, &size);
  264         KASSERT(sb == NULL || *sizep == size, ("invalid size"));
  265         if (size != 0 && sb != NULL)
  266                 sbuf_bcat(sb, buf, size);
  267         free(buf, M_TEMP);
  268         *sizep = size;
  269 }
  270 
  271 static void
  272 __linuxN(note_nt_auxv)(void *arg, struct sbuf *sb, size_t *sizep)
  273 {
  274         struct proc *p;
  275         size_t size;
  276 
  277         p = arg;
  278         if (sb == NULL) {
  279                 size = 0;
  280                 sb = sbuf_new(NULL, NULL, LINUX_AT_COUNT * sizeof(Elf_Auxinfo),
  281                     SBUF_FIXEDLEN);
  282                 sbuf_set_drain(sb, sbuf_count_drain, &size);
  283                 PHOLD(p);
  284                 proc_getauxv(curthread, p, sb);
  285                 PRELE(p);
  286                 sbuf_finish(sb);
  287                 sbuf_delete(sb);
  288                 *sizep = size;
  289         } else {
  290                 PHOLD(p);
  291                 proc_getauxv(curthread, p, sb);
  292                 PRELE(p);
  293         }
  294 }
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FreeBSD/Linux Kernel Cross Reference sys/compat/linux/linux_elf.c

FreeBSD/Linux Kernel Cross Reference
sys/compat/linux/linux_elf.c
