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debugedit-5.0
tools/sepdebugcrcfix.c
404 строки
13 KB
Mark Wielaard
sepdebugcrcfix: Report errors if we cannot chmod the file.
05 июл 2021, 16:26
05 июл 2021, 16:26
f72204d
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/* Copyright (C) 2013 Free Software Foundation, Inc. This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; either version 3 of the License, or (at your option) any later version. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program. If not, see <http://www.gnu.org/licenses/>. */ /* Version 2013-06-24. */ #ifdef HAVE_CONFIG_H #include "config.h" #endif #include <string.h> #include <fcntl.h> #include <errno.h> #include <sys/types.h> #include <sys/stat.h> #include <unistd.h> #include <sys/mman.h> #include <endian.h> #include <stdio.h> #include <stdlib.h> #include <error.h> #include <libelf.h> #include <gelf.h> #ifndef _ #define _(x) x #endif #define static_assert(expr) \ extern int never_defined_just_used_for_checking[(expr) ? 1 : -1] #ifndef min # define min(a, b) ((a) < (b) ? (a) : (b)) #endif static_assert (sizeof (unsigned long) >= sizeof (uint32_t)); typedef int bool; static const bool false = 0, true = 1; /* This is bfd_calc_gnu_debuglink_crc32 from bfd/opncls.c. */ static unsigned long calc_gnu_debuglink_crc32 (unsigned long crc, const unsigned char *buf, size_t len) { static const unsigned long crc32_table[256] = { 0x00000000, 0x77073096, 0xee0e612c, 0x990951ba, 0x076dc419, 0x706af48f, 0xe963a535, 0x9e6495a3, 0x0edb8832, 0x79dcb8a4, 0xe0d5e91e, 0x97d2d988, 0x09b64c2b, 0x7eb17cbd, 0xe7b82d07, 0x90bf1d91, 0x1db71064, 0x6ab020f2, 0xf3b97148, 0x84be41de, 0x1adad47d, 0x6ddde4eb, 0xf4d4b551, 0x83d385c7, 0x136c9856, 0x646ba8c0, 0xfd62f97a, 0x8a65c9ec, 0x14015c4f, 0x63066cd9, 0xfa0f3d63, 0x8d080df5, 0x3b6e20c8, 0x4c69105e, 0xd56041e4, 0xa2677172, 0x3c03e4d1, 0x4b04d447, 0xd20d85fd, 0xa50ab56b, 0x35b5a8fa, 0x42b2986c, 0xdbbbc9d6, 0xacbcf940, 0x32d86ce3, 0x45df5c75, 0xdcd60dcf, 0xabd13d59, 0x26d930ac, 0x51de003a, 0xc8d75180, 0xbfd06116, 0x21b4f4b5, 0x56b3c423, 0xcfba9599, 0xb8bda50f, 0x2802b89e, 0x5f058808, 0xc60cd9b2, 0xb10be924, 0x2f6f7c87, 0x58684c11, 0xc1611dab, 0xb6662d3d, 0x76dc4190, 0x01db7106, 0x98d220bc, 0xefd5102a, 0x71b18589, 0x06b6b51f, 0x9fbfe4a5, 0xe8b8d433, 0x7807c9a2, 0x0f00f934, 0x9609a88e, 0xe10e9818, 0x7f6a0dbb, 0x086d3d2d, 0x91646c97, 0xe6635c01, 0x6b6b51f4, 0x1c6c6162, 0x856530d8, 0xf262004e, 0x6c0695ed, 0x1b01a57b, 0x8208f4c1, 0xf50fc457, 0x65b0d9c6, 0x12b7e950, 0x8bbeb8ea, 0xfcb9887c, 0x62dd1ddf, 0x15da2d49, 0x8cd37cf3, 0xfbd44c65, 0x4db26158, 0x3ab551ce, 0xa3bc0074, 0xd4bb30e2, 0x4adfa541, 0x3dd895d7, 0xa4d1c46d, 0xd3d6f4fb, 0x4369e96a, 0x346ed9fc, 0xad678846, 0xda60b8d0, 0x44042d73, 0x33031de5, 0xaa0a4c5f, 0xdd0d7cc9, 0x5005713c, 0x270241aa, 0xbe0b1010, 0xc90c2086, 0x5768b525, 0x206f85b3, 0xb966d409, 0xce61e49f, 0x5edef90e, 0x29d9c998, 0xb0d09822, 0xc7d7a8b4, 0x59b33d17, 0x2eb40d81, 0xb7bd5c3b, 0xc0ba6cad, 0xedb88320, 0x9abfb3b6, 0x03b6e20c, 0x74b1d29a, 0xead54739, 0x9dd277af, 0x04db2615, 0x73dc1683, 0xe3630b12, 0x94643b84, 0x0d6d6a3e, 0x7a6a5aa8, 0xe40ecf0b, 0x9309ff9d, 0x0a00ae27, 0x7d079eb1, 0xf00f9344, 0x8708a3d2, 0x1e01f268, 0x6906c2fe, 0xf762575d, 0x806567cb, 0x196c3671, 0x6e6b06e7, 0xfed41b76, 0x89d32be0, 0x10da7a5a, 0x67dd4acc, 0xf9b9df6f, 0x8ebeeff9, 0x17b7be43, 0x60b08ed5, 0xd6d6a3e8, 0xa1d1937e, 0x38d8c2c4, 0x4fdff252, 0xd1bb67f1, 0xa6bc5767, 0x3fb506dd, 0x48b2364b, 0xd80d2bda, 0xaf0a1b4c, 0x36034af6, 0x41047a60, 0xdf60efc3, 0xa867df55, 0x316e8eef, 0x4669be79, 0xcb61b38c, 0xbc66831a, 0x256fd2a0, 0x5268e236, 0xcc0c7795, 0xbb0b4703, 0x220216b9, 0x5505262f, 0xc5ba3bbe, 0xb2bd0b28, 0x2bb45a92, 0x5cb36a04, 0xc2d7ffa7, 0xb5d0cf31, 0x2cd99e8b, 0x5bdeae1d, 0x9b64c2b0, 0xec63f226, 0x756aa39c, 0x026d930a, 0x9c0906a9, 0xeb0e363f, 0x72076785, 0x05005713, 0x95bf4a82, 0xe2b87a14, 0x7bb12bae, 0x0cb61b38, 0x92d28e9b, 0xe5d5be0d, 0x7cdcefb7, 0x0bdbdf21, 0x86d3d2d4, 0xf1d4e242, 0x68ddb3f8, 0x1fda836e, 0x81be16cd, 0xf6b9265b, 0x6fb077e1, 0x18b74777, 0x88085ae6, 0xff0f6a70, 0x66063bca, 0x11010b5c, 0x8f659eff, 0xf862ae69, 0x616bffd3, 0x166ccf45, 0xa00ae278, 0xd70dd2ee, 0x4e048354, 0x3903b3c2, 0xa7672661, 0xd06016f7, 0x4969474d, 0x3e6e77db, 0xaed16a4a, 0xd9d65adc, 0x40df0b66, 0x37d83bf0, 0xa9bcae53, 0xdebb9ec5, 0x47b2cf7f, 0x30b5ffe9, 0xbdbdf21c, 0xcabac28a, 0x53b39330, 0x24b4a3a6, 0xbad03605, 0xcdd70693, 0x54de5729, 0x23d967bf, 0xb3667a2e, 0xc4614ab8, 0x5d681b02, 0x2a6f2b94, 0xb40bbe37, 0xc30c8ea1, 0x5a05df1b, 0x2d02ef8d }; const unsigned char *end; crc = ~crc & 0xffffffff; for (end = buf + len; buf < end; ++ buf) crc = crc32_table[(crc ^ *buf) & 0xff] ^ (crc >> 8); return ~crc & 0xffffffff; } static size_t updated_count, matched_count, failed_count; static const char *usr_lib_debug; static bool crc32 (const char *fname, const char *base_fname, uint32_t *crcp) { char *reldir = strdup (base_fname); if (reldir == NULL) error (1, 0, _("out of memory")); char *s = reldir + strlen (reldir); while (s > reldir && s[-1] != '/') *--s = '\0'; char *debugname; if (asprintf (&debugname, "%s/%s/%s", usr_lib_debug, reldir, fname) <= 0) error (1, 0, _("out of memory")); free (reldir); int fd = open (debugname, O_RDONLY); if (fd == -1) { error (0, errno, _("cannot open \"%s\""), debugname); return false; } off64_t size = lseek64 (fd, 0, SEEK_END); if (size == -1) { error (0, errno, _("cannot get size of \"%s\""), debugname); return false; } off_t offset = 0; uint32_t crc = 0; void *buf = NULL; while (offset < size) { const size_t maplen = min (0x10000, size - offset); void *map = NULL; if (buf == NULL) { map = mmap (NULL, maplen, PROT_READ, MAP_PRIVATE #ifdef MAP_POPULATE | MAP_POPULATE #endif , fd, offset); if (map == MAP_FAILED) { error (0, errno, _("cannot map 0x%llx bytes at offset 0x%llx " "of file \"%s\""), (unsigned long long) maplen, (unsigned long long) offset, debugname); map = NULL; } } if (map == NULL) { if (buf == NULL) { buf = malloc (maplen); if (buf == NULL) error (1, 0, _("out of memory")); } ssize_t got = pread (fd, buf, maplen, offset); if (got != maplen) { error (0, errno, _("cannot read 0x%llx bytes at offset 0x%llx " "of file \"%s\""), (unsigned long long) maplen, (unsigned long long) offset, debugname); free (buf); free (debugname); return false; } } crc = calc_gnu_debuglink_crc32 (crc, map ?: buf, maplen); if (map && munmap (map, maplen) != 0) error (1, errno, _("cannot unmap 0x%llx bytes at offset 0x%llx " "of file \"%s\""), (unsigned long long) maplen, (unsigned long long) offset, debugname); offset += maplen; } free (buf); if (close (fd) != 0) { error (0, errno, _("cannot close \"%s\""), debugname); free (debugname); return false; } free (debugname); *crcp = crc; return true; } static bool process (Elf *elf, int fd, const char *fname) { GElf_Ehdr ehdr_mem, *ehdr = gelf_getehdr (elf, &ehdr_mem); if (ehdr == NULL) { error (0, 0, _("cannot get ELF header of \"%s\""), fname); return false; } if (ehdr->e_ident[EI_DATA] != ELFDATA2LSB && ehdr->e_ident[EI_DATA] != ELFDATA2MSB) { error (0, 0, _("invalid ELF endianity of \"%s\""), fname); return false; } Elf_Scn *scn = NULL; const char scnname[] = ".gnu_debuglink"; while ((scn = elf_nextscn (elf, scn)) != NULL) { GElf_Shdr shdr_mem, *shdr = gelf_getshdr (scn, &shdr_mem); if (shdr == NULL) { error (0, 0, _("cannot get section # %zu in \"%s\""), elf_ndxscn (scn), fname); continue; } const char *sname = elf_strptr (elf, ehdr->e_shstrndx, shdr->sh_name); if (sname == NULL) { error (0, 0, _("cannot get name of section # %zu in \"%s\""), elf_ndxscn (scn), fname); continue; } if (strcmp (sname, scnname) != 0) continue; Elf_Data *data = elf_getdata (scn, NULL); if (data == NULL) { error (0, 0, _("cannot get data of section \"%s\" # %zu in \"%s\""), scnname, elf_ndxscn (scn), fname); continue; } if ((data->d_size & 3) != 0) { error (0, 0, _("invalid size of section \"%s\" # %zu in \"%s\""), scnname, elf_ndxscn (scn), fname); continue; } const uint8_t *zerop = memchr (data->d_buf, '\0', data->d_size); if (zerop == NULL) { error (0, 0, _("no file string in section \"%s\" # %zu in \"%s\""), scnname, elf_ndxscn (scn), fname); continue; } const uint8_t *crcp = (const uint8_t *) ((uintptr_t) (zerop + 1 + 3) & -4); if (crcp + 4 != (uint8_t *) data->d_buf + data->d_size) { error (0, 0, _("invalid format of section \"%s\" # %zu in \"%s\""), scnname, elf_ndxscn (scn), fname); continue; } uint32_t had_crc_targetendian = *(const uint32_t *) crcp; uint32_t had_crc = (ehdr->e_ident[EI_DATA] == ELFDATA2LSB ? le32toh (had_crc_targetendian) : be32toh (had_crc_targetendian)); uint32_t crc; if (! crc32 (data->d_buf, fname, &crc)) return false; if (crc == had_crc) { matched_count++; return true; } updated_count++; off64_t seekto = (shdr->sh_offset + data->d_off + (crcp - (const uint8_t *) data->d_buf)); uint32_t crc_targetendian = (ehdr->e_ident[EI_DATA] == ELFDATA2LSB ? htole32 (crc) : htobe32 (crc)); ssize_t wrote = pwrite (fd, &crc_targetendian, sizeof (crc_targetendian), seekto); if (wrote != sizeof (crc_targetendian)) { error (0, 0, _("cannot write new CRC to 0x%llx " "inside section \"%s\" # %zu in \"%s\""), (unsigned long long) seekto, scnname, elf_ndxscn (scn), fname); return false; } return true; } error (0, 0, _("cannot find section \"%s\" in \"%s\""), scnname, fname); return false; } static void version (void) { printf("sepdebugcrcfix %s\n", VERSION); exit(EXIT_SUCCESS); } static const char *helpText = "Usage: %s DEBUG_DIR FILEs\n" \ "Fixes CRC in .debug files under DEBUG_DIR for the given FILEs\n" \ "\n" \ "DEBUG_DIR is usually \"usr/lib/debug\".\n" \ "FILEs should have relative paths.\n" \ "The relative paths will be used to find the corresponding .debug\n" \ "files under DEBUGDIR\n"; static void help (const char *progname, bool error) { FILE *f = error ? stderr : stdout; fprintf (f, helpText, progname); exit (error ? EXIT_FAILURE : EXIT_SUCCESS); } int main (int argc, char **argv) { if (argc == 2 && strcmp (argv[1], "--version") == 0) version (); if (argc == 2 && strcmp (argv[1], "--help") == 0) help (argv[0], false); if (argc < 2) help (argv[0], true); usr_lib_debug = argv[1]; if (elf_version (EV_CURRENT) == EV_NONE) error (1, 0, _("error initializing libelf: %s"), elf_errmsg (-1)); for (int argi = 2; argi < argc; argi++) { const char *fname = argv[argi]; struct stat stat_buf; if (stat(fname, &stat_buf) < 0) { error (0, errno, _("cannot stat input \"%s\""), fname); failed_count++; continue; } /* Make sure we can read and write */ if (chmod (fname, stat_buf.st_mode | S_IRUSR | S_IWUSR) != 0) error (0, errno, _("cannot chmod \"%s\" to make sure we can read and write"), fname); bool failed = false; int fd = open64 (fname, O_RDWR); if (fd == -1) { error (0, errno, _("cannot open \"%s\""), fname); failed = true; } else { Elf *elf = elf_begin (fd, ELF_C_READ_MMAP, NULL); if (elf == NULL) { error (0, 0, _("cannot open \"%s\" as ELF: %s"), fname, elf_errmsg (-1)); failed = true; } else { if (! process (elf, fd, fname)) failed = true; if (elf_end (elf) != 0) { error (0, 0, _("cannot close \"%s\" as ELF: %s"), fname, elf_errmsg (-1)); failed = true; } } if (close (fd) != 0) { error (0, errno, _("cannot close \"%s\""), fname); failed = true; } } /* Restore old access rights. Including any suid bits reset. */ if (chmod (fname, stat_buf.st_mode) != 0) error (0, errno, _("cannot chmod \"%s\" to restore old access rights"), fname); if (failed) failed_count++; } printf ("%s: Updated %zu CRC32s, %zu CRC32s did match.\n", argv[0], updated_count, matched_count); if (failed_count) printf ("%s: Failed for %zu files.\n", argv[0], failed_count); return failed_count == 0 ? EXIT_SUCCESS : EXIT_FAILURE; }