diff options
Diffstat (limited to 'src/readelf.c')
| -rw-r--r-- | src/readelf.c | 1899 |
1 files changed, 1899 insertions, 0 deletions
diff --git a/src/readelf.c b/src/readelf.c new file mode 100644 index 0000000..a2a66dd --- /dev/null +++ b/src/readelf.c @@ -0,0 +1,1899 @@ +/* + * Copyright (c) Christos Zoulas 2003. + * All Rights Reserved. + * + * 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 immediately at the beginning of the file, without modification, + * 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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 "file.h" + +#ifndef lint +FILE_RCSID("@(#)$File: readelf.c,v 1.190 2023/07/27 19:39:06 christos Exp $") +#endif + +#ifdef BUILTIN_ELF +#include <string.h> +#include <ctype.h> +#include <stdlib.h> +#ifdef HAVE_UNISTD_H +#include <unistd.h> +#endif + +#include "readelf.h" +#include "magic.h" + +#ifdef ELFCORE +file_private int dophn_core(struct magic_set *, int, int, int, off_t, int, + size_t, off_t, int *, uint16_t *); +#endif +file_private int dophn_exec(struct magic_set *, int, int, int, off_t, int, + size_t, off_t, int, int *, uint16_t *); +file_private int doshn(struct magic_set *, int, int, int, off_t, int, size_t, + off_t, int, int, int *, uint16_t *); +file_private size_t donote(struct magic_set *, void *, size_t, size_t, int, + int, size_t, int *, uint16_t *, int, off_t, int, off_t); + +#define ELF_ALIGN(a) ((((a) + align - 1) / align) * align) + +#define isquote(c) (strchr("'\"`", (c)) != NULL) + +file_private uint16_t getu16(int, uint16_t); +file_private uint32_t getu32(int, uint32_t); +file_private uint64_t getu64(int, uint64_t); + +#define SIZE_UNKNOWN CAST(off_t, -1) + +file_private int +toomany(struct magic_set *ms, const char *name, uint16_t num) +{ + if (ms->flags & MAGIC_MIME) + return 1; + if (file_printf(ms, ", too many %s (%u)", name, num) == -1) + return -1; + return 1; +} + +file_private uint16_t +getu16(int swap, uint16_t value) +{ + union { + uint16_t ui; + char c[2]; + } retval, tmpval; + + if (swap) { + tmpval.ui = value; + + retval.c[0] = tmpval.c[1]; + retval.c[1] = tmpval.c[0]; + + return retval.ui; + } else + return value; +} + +file_private uint32_t +getu32(int swap, uint32_t value) +{ + union { + uint32_t ui; + char c[4]; + } retval, tmpval; + + if (swap) { + tmpval.ui = value; + + retval.c[0] = tmpval.c[3]; + retval.c[1] = tmpval.c[2]; + retval.c[2] = tmpval.c[1]; + retval.c[3] = tmpval.c[0]; + + return retval.ui; + } else + return value; +} + +file_private uint64_t +getu64(int swap, uint64_t value) +{ + union { + uint64_t ui; + char c[8]; + } retval, tmpval; + + if (swap) { + tmpval.ui = value; + + retval.c[0] = tmpval.c[7]; + retval.c[1] = tmpval.c[6]; + retval.c[2] = tmpval.c[5]; + retval.c[3] = tmpval.c[4]; + retval.c[4] = tmpval.c[3]; + retval.c[5] = tmpval.c[2]; + retval.c[6] = tmpval.c[1]; + retval.c[7] = tmpval.c[0]; + + return retval.ui; + } else + return value; +} + +#define elf_getu16(swap, value) getu16(swap, value) +#define elf_getu32(swap, value) getu32(swap, value) +#define elf_getu64(swap, value) getu64(swap, value) + +#define xsh_addr (clazz == ELFCLASS32 \ + ? CAST(void *, &sh32) \ + : CAST(void *, &sh64)) +#define xsh_sizeof (clazz == ELFCLASS32 \ + ? sizeof(sh32) \ + : sizeof(sh64)) +#define xsh_size CAST(size_t, (clazz == ELFCLASS32 \ + ? elf_getu32(swap, sh32.sh_size) \ + : elf_getu64(swap, sh64.sh_size))) +#define xsh_offset CAST(off_t, (clazz == ELFCLASS32 \ + ? elf_getu32(swap, sh32.sh_offset) \ + : elf_getu64(swap, sh64.sh_offset))) +#define xsh_type (clazz == ELFCLASS32 \ + ? elf_getu32(swap, sh32.sh_type) \ + : elf_getu32(swap, sh64.sh_type)) +#define xsh_name (clazz == ELFCLASS32 \ + ? elf_getu32(swap, sh32.sh_name) \ + : elf_getu32(swap, sh64.sh_name)) + +#define xph_addr (clazz == ELFCLASS32 \ + ? CAST(void *, &ph32) \ + : CAST(void *, &ph64)) +#define xph_sizeof (clazz == ELFCLASS32 \ + ? sizeof(ph32) \ + : sizeof(ph64)) +#define xph_type (clazz == ELFCLASS32 \ + ? elf_getu32(swap, ph32.p_type) \ + : elf_getu32(swap, ph64.p_type)) +#define xph_offset CAST(off_t, (clazz == ELFCLASS32 \ + ? elf_getu32(swap, ph32.p_offset) \ + : elf_getu64(swap, ph64.p_offset))) +#define xph_align CAST(size_t, (clazz == ELFCLASS32 \ + ? CAST(off_t, (ph32.p_align ? \ + elf_getu32(swap, ph32.p_align) : 4))\ + : CAST(off_t, (ph64.p_align ? \ + elf_getu64(swap, ph64.p_align) : 4)))) +#define xph_vaddr CAST(size_t, (clazz == ELFCLASS32 \ + ? CAST(off_t, (ph32.p_vaddr ? \ + elf_getu32(swap, ph32.p_vaddr) : 4))\ + : CAST(off_t, (ph64.p_vaddr ? \ + elf_getu64(swap, ph64.p_vaddr) : 4)))) +#define xph_filesz CAST(size_t, (clazz == ELFCLASS32 \ + ? elf_getu32(swap, ph32.p_filesz) \ + : elf_getu64(swap, ph64.p_filesz))) +#define xph_memsz CAST(size_t, ((clazz == ELFCLASS32 \ + ? elf_getu32(swap, ph32.p_memsz) \ + : elf_getu64(swap, ph64.p_memsz)))) +#define xnh_addr (clazz == ELFCLASS32 \ + ? CAST(void *, &nh32) \ + : CAST(void *, &nh64)) +#define xnh_sizeof (clazz == ELFCLASS32 \ + ? sizeof(nh32) \ + : sizeof(nh64)) +#define xnh_type (clazz == ELFCLASS32 \ + ? elf_getu32(swap, nh32.n_type) \ + : elf_getu32(swap, nh64.n_type)) +#define xnh_namesz (clazz == ELFCLASS32 \ + ? elf_getu32(swap, nh32.n_namesz) \ + : elf_getu32(swap, nh64.n_namesz)) +#define xnh_descsz (clazz == ELFCLASS32 \ + ? elf_getu32(swap, nh32.n_descsz) \ + : elf_getu32(swap, nh64.n_descsz)) + +#define xdh_addr (clazz == ELFCLASS32 \ + ? CAST(void *, &dh32) \ + : CAST(void *, &dh64)) +#define xdh_sizeof (clazz == ELFCLASS32 \ + ? sizeof(dh32) \ + : sizeof(dh64)) +#define xdh_tag (clazz == ELFCLASS32 \ + ? elf_getu32(swap, dh32.d_tag) \ + : elf_getu64(swap, dh64.d_tag)) +#define xdh_val (clazz == ELFCLASS32 \ + ? elf_getu32(swap, dh32.d_un.d_val) \ + : elf_getu64(swap, dh64.d_un.d_val)) + +#define xcap_addr (clazz == ELFCLASS32 \ + ? CAST(void *, &cap32) \ + : CAST(void *, &cap64)) +#define xcap_sizeof (clazz == ELFCLASS32 \ + ? sizeof(cap32) \ + : sizeof(cap64)) +#define xcap_tag (clazz == ELFCLASS32 \ + ? elf_getu32(swap, cap32.c_tag) \ + : elf_getu64(swap, cap64.c_tag)) +#define xcap_val (clazz == ELFCLASS32 \ + ? elf_getu32(swap, cap32.c_un.c_val) \ + : elf_getu64(swap, cap64.c_un.c_val)) + +#define xauxv_addr (clazz == ELFCLASS32 \ + ? CAST(void *, &auxv32) \ + : CAST(void *, &auxv64)) +#define xauxv_sizeof (clazz == ELFCLASS32 \ + ? sizeof(auxv32) \ + : sizeof(auxv64)) +#define xauxv_type (clazz == ELFCLASS32 \ + ? elf_getu32(swap, auxv32.a_type) \ + : elf_getu64(swap, auxv64.a_type)) +#define xauxv_val (clazz == ELFCLASS32 \ + ? elf_getu32(swap, auxv32.a_v) \ + : elf_getu64(swap, auxv64.a_v)) + +#define prpsoffsets(i) (clazz == ELFCLASS32 \ + ? prpsoffsets32[i] \ + : prpsoffsets64[i]) + +#ifdef ELFCORE +/* + * Try larger offsets first to avoid false matches + * from earlier data that happen to look like strings. + */ +static const size_t prpsoffsets32[] = { +#ifdef USE_NT_PSINFO + 104, /* SunOS 5.x (command line) */ + 88, /* SunOS 5.x (short name) */ +#endif /* USE_NT_PSINFO */ + + 100, /* SunOS 5.x (command line) */ + 84, /* SunOS 5.x (short name) */ + + 44, /* Linux (command line) */ + 28, /* Linux (short name) */ + + 48, /* Linux PowerPC (command line) */ + 32, /* Linux PowerPC (short name) */ + + 8, /* FreeBSD */ +}; + +static const size_t prpsoffsets64[] = { +#ifdef USE_NT_PSINFO + 152, /* SunOS 5.x (command line) */ + 136, /* SunOS 5.x (short name) */ +#endif /* USE_NT_PSINFO */ + + 136, /* SunOS 5.x, 64-bit (command line) */ + 120, /* SunOS 5.x, 64-bit (short name) */ + + 56, /* Linux (command line) */ + 40, /* Linux (tested on core from 2.4.x, short name) */ + + 16, /* FreeBSD, 64-bit */ +}; + +#define NOFFSETS32 __arraycount(prpsoffsets32) +#define NOFFSETS64 __arraycount(prpsoffsets64) + +#define NOFFSETS (clazz == ELFCLASS32 ? NOFFSETS32 : NOFFSETS64) + +/* + * Look through the program headers of an executable image, searching + * for a PT_NOTE section of type NT_PRPSINFO, with a name "CORE" or + * "FreeBSD"; if one is found, try looking in various places in its + * contents for a 16-character string containing only printable + * characters - if found, that string should be the name of the program + * that dropped core. Note: right after that 16-character string is, + * at least in SunOS 5.x (and possibly other SVR4-flavored systems) and + * Linux, a longer string (80 characters, in 5.x, probably other + * SVR4-flavored systems, and Linux) containing the start of the + * command line for that program. + * + * SunOS 5.x core files contain two PT_NOTE sections, with the types + * NT_PRPSINFO (old) and NT_PSINFO (new). These structs contain the + * same info about the command name and command line, so it probably + * isn't worthwhile to look for NT_PSINFO, but the offsets are provided + * above (see USE_NT_PSINFO), in case we ever decide to do so. The + * NT_PRPSINFO and NT_PSINFO sections are always in order and adjacent; + * the SunOS 5.x file command relies on this (and prefers the latter). + * + * The signal number probably appears in a section of type NT_PRSTATUS, + * but that's also rather OS-dependent, in ways that are harder to + * dissect with heuristics, so I'm not bothering with the signal number. + * (I suppose the signal number could be of interest in situations where + * you don't have the binary of the program that dropped core; if you + * *do* have that binary, the debugger will probably tell you what + * signal it was.) + */ + +#define OS_STYLE_SVR4 0 +#define OS_STYLE_FREEBSD 1 +#define OS_STYLE_NETBSD 2 + +file_private const char os_style_names[][8] = { + "SVR4", + "FreeBSD", + "NetBSD", +}; + +#define FLAGS_CORE_STYLE 0x0003 + +#define FLAGS_DID_CORE 0x0004 +#define FLAGS_DID_OS_NOTE 0x0008 +#define FLAGS_DID_BUILD_ID 0x0010 +#define FLAGS_DID_CORE_STYLE 0x0020 +#define FLAGS_DID_NETBSD_PAX 0x0040 +#define FLAGS_DID_NETBSD_MARCH 0x0080 +#define FLAGS_DID_NETBSD_CMODEL 0x0100 +#define FLAGS_DID_NETBSD_EMULATION 0x0200 +#define FLAGS_DID_NETBSD_UNKNOWN 0x0400 +#define FLAGS_IS_CORE 0x0800 +#define FLAGS_DID_AUXV 0x1000 + +file_private int +dophn_core(struct magic_set *ms, int clazz, int swap, int fd, off_t off, + int num, size_t size, off_t fsize, int *flags, uint16_t *notecount) +{ + Elf32_Phdr ph32; + Elf64_Phdr ph64; + size_t offset, len; + unsigned char nbuf[BUFSIZ]; + ssize_t bufsize; + off_t ph_off = off, offs; + int ph_num = num; + + if (ms->flags & MAGIC_MIME) + return 0; + + if (num == 0) { + if (file_printf(ms, ", no program header") == -1) + return -1; + return 0; + } + if (size != xph_sizeof) { + if (file_printf(ms, ", corrupted program header size") == -1) + return -1; + return 0; + } + + /* + * Loop through all the program headers. + */ + for ( ; num; num--) { + if (pread(fd, xph_addr, xph_sizeof, off) < + CAST(ssize_t, xph_sizeof)) { + if (file_printf(ms, + ", can't read elf program headers at %jd", + (intmax_t)off) == -1) + return -1; + return 0; + } + off += size; + + if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { + /* Perhaps warn here */ + continue; + } + + if (xph_type != PT_NOTE) + continue; + + /* + * This is a PT_NOTE section; loop through all the notes + * in the section. + */ + len = xph_filesz < sizeof(nbuf) ? xph_filesz : sizeof(nbuf); + offs = xph_offset; + if ((bufsize = pread(fd, nbuf, len, offs)) == -1) { + if (file_printf(ms, " can't read note section at %jd", + (intmax_t)offs) == -1) + return -1; + return 0; + } + offset = 0; + for (;;) { + if (offset >= CAST(size_t, bufsize)) + break; + offset = donote(ms, nbuf, offset, CAST(size_t, bufsize), + clazz, swap, 4, flags, notecount, fd, ph_off, + ph_num, fsize); + if (offset == 0) + break; + + } + } + return 0; +} +#endif + +static int +do_note_netbsd_version(struct magic_set *ms, int swap, void *v) +{ + uint32_t desc; + memcpy(&desc, v, sizeof(desc)); + desc = elf_getu32(swap, desc); + + if (file_printf(ms, ", for NetBSD") == -1) + return -1; + /* + * The version number used to be stuck as 199905, and was thus + * basically content-free. Newer versions of NetBSD have fixed + * this and now use the encoding of __NetBSD_Version__: + * + * MMmmrrpp00 + * + * M = major version + * m = minor version + * r = release ["",A-Z,Z[A-Z] but numeric] + * p = patchlevel + */ + if (desc > 100000000U) { + uint32_t ver_patch = (desc / 100) % 100; + uint32_t ver_rel = (desc / 10000) % 100; + uint32_t ver_min = (desc / 1000000) % 100; + uint32_t ver_maj = desc / 100000000; + + if (file_printf(ms, " %u.%u", ver_maj, ver_min) == -1) + return -1; + if (ver_maj >= 9) { + ver_patch += 100 * ver_rel; + ver_rel = 0; + } + if (ver_rel == 0 && ver_patch != 0) { + if (file_printf(ms, ".%u", ver_patch) == -1) + return -1; + } else if (ver_rel != 0) { + while (ver_rel > 26) { + if (file_printf(ms, "Z") == -1) + return -1; + ver_rel -= 26; + } + if (file_printf(ms, "%c", 'A' + ver_rel - 1) == -1) + return -1; + } + } + return 0; +} + +static int +do_note_freebsd_version(struct magic_set *ms, int swap, void *v) +{ + uint32_t desc; + + memcpy(&desc, v, sizeof(desc)); + desc = elf_getu32(swap, desc); + if (file_printf(ms, ", for FreeBSD") == -1) + return -1; + + /* + * Contents is __FreeBSD_version, whose relation to OS + * versions is defined by a huge table in the Porter's + * Handbook. This is the general scheme: + * + * Releases: + * Mmp000 (before 4.10) + * Mmi0p0 (before 5.0) + * Mmm0p0 + * + * Development branches: + * Mmpxxx (before 4.6) + * Mmp1xx (before 4.10) + * Mmi1xx (before 5.0) + * M000xx (pre-M.0) + * Mmm1xx + * + * M = major version + * m = minor version + * i = minor version increment (491000 -> 4.10) + * p = patchlevel + * x = revision + * + * The first release of FreeBSD to use ELF by default + * was version 3.0. + */ + if (desc == 460002) { + if (file_printf(ms, " 4.6.2") == -1) + return -1; + } else if (desc < 460100) { + if (file_printf(ms, " %d.%d", desc / 100000, + desc / 10000 % 10) == -1) + return -1; + if (desc / 1000 % 10 > 0) + if (file_printf(ms, ".%d", desc / 1000 % 10) == -1) + return -1; + if ((desc % 1000 > 0) || (desc % 100000 == 0)) + if (file_printf(ms, " (%d)", desc) == -1) + return -1; + } else if (desc < 500000) { + if (file_printf(ms, " %d.%d", desc / 100000, + desc / 10000 % 10 + desc / 1000 % 10) == -1) + return -1; + if (desc / 100 % 10 > 0) { + if (file_printf(ms, " (%d)", desc) == -1) + return -1; + } else if (desc / 10 % 10 > 0) { + if (file_printf(ms, ".%d", desc / 10 % 10) == -1) + return -1; + } + } else { + if (file_printf(ms, " %d.%d", desc / 100000, + desc / 1000 % 100) == -1) + return -1; + if ((desc / 100 % 10 > 0) || + (desc % 100000 / 100 == 0)) { + if (file_printf(ms, " (%d)", desc) == -1) + return -1; + } else if (desc / 10 % 10 > 0) { + if (file_printf(ms, ".%d", desc / 10 % 10) == -1) + return -1; + } + } + return 0; +} + +file_private int +/*ARGSUSED*/ +do_bid_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, + int swap __attribute__((__unused__)), uint32_t namesz, uint32_t descsz, + size_t noff, size_t doff, int *flags) +{ + if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "GNU") == 0 && + type == NT_GNU_BUILD_ID && (descsz >= 4 && descsz <= 20)) { + uint8_t desc[20]; + const char *btype; + uint32_t i; + *flags |= FLAGS_DID_BUILD_ID; + switch (descsz) { + case 8: + btype = "xxHash"; + break; + case 16: + btype = "md5/uuid"; + break; + case 20: + btype = "sha1"; + break; + default: + btype = "unknown"; + break; + } + if (file_printf(ms, ", BuildID[%s]=", btype) == -1) + return -1; + memcpy(desc, &nbuf[doff], descsz); + for (i = 0; i < descsz; i++) + if (file_printf(ms, "%02x", desc[i]) == -1) + return -1; + return 1; + } + if (namesz == 4 && strcmp(RCAST(char *, &nbuf[noff]), "Go") == 0 && + type == NT_GO_BUILD_ID && descsz < 128) { + char buf[256]; + if (file_printf(ms, ", Go BuildID=%s", + file_copystr(buf, sizeof(buf), descsz, + RCAST(const char *, &nbuf[doff]))) == -1) + return -1; + return 1; + } + return 0; +} + +file_private int +do_os_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, + int swap, uint32_t namesz, uint32_t descsz, + size_t noff, size_t doff, int *flags) +{ + const char *name = RCAST(const char *, &nbuf[noff]); + + if (namesz == 5 && strcmp(name, "SuSE") == 0 && + type == NT_GNU_VERSION && descsz == 2) { + *flags |= FLAGS_DID_OS_NOTE; + if (file_printf(ms, ", for SuSE %d.%d", nbuf[doff], + nbuf[doff + 1]) == -1) + return -1; + return 1; + } + + if (namesz == 4 && strcmp(name, "GNU") == 0 && + type == NT_GNU_VERSION && descsz == 16) { + uint32_t desc[4]; + memcpy(desc, &nbuf[doff], sizeof(desc)); + + *flags |= FLAGS_DID_OS_NOTE; + if (file_printf(ms, ", for GNU/") == -1) + return -1; + switch (elf_getu32(swap, desc[0])) { + case GNU_OS_LINUX: + if (file_printf(ms, "Linux") == -1) + return -1; + break; + case GNU_OS_HURD: + if (file_printf(ms, "Hurd") == -1) + return -1; + break; + case GNU_OS_SOLARIS: + if (file_printf(ms, "Solaris") == -1) + return -1; + break; + case GNU_OS_KFREEBSD: + if (file_printf(ms, "kFreeBSD") == -1) + return -1; + break; + case GNU_OS_KNETBSD: + if (file_printf(ms, "kNetBSD") == -1) + return -1; + break; + default: + if (file_printf(ms, "<unknown>") == -1) + return -1; + } + if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), + elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) + return -1; + return 1; + } + + if (namesz == 7 && strcmp(name, "NetBSD") == 0) { + if (type == NT_NETBSD_VERSION && descsz == 4) { + *flags |= FLAGS_DID_OS_NOTE; + if (do_note_netbsd_version(ms, swap, &nbuf[doff]) == -1) + return -1; + return 1; + } + } + + if (namesz == 8 && strcmp(name, "FreeBSD") == 0) { + if (type == NT_FREEBSD_VERSION && descsz == 4) { + *flags |= FLAGS_DID_OS_NOTE; + if (do_note_freebsd_version(ms, swap, &nbuf[doff]) + == -1) + return -1; + return 1; + } + } + + if (namesz == 8 && strcmp(name, "OpenBSD") == 0 && + type == NT_OPENBSD_VERSION && descsz == 4) { + *flags |= FLAGS_DID_OS_NOTE; + if (file_printf(ms, ", for OpenBSD") == -1) + return -1; + /* Content of note is always 0 */ + return 1; + } + + if (namesz == 10 && strcmp(name, "DragonFly") == 0 && + type == NT_DRAGONFLY_VERSION && descsz == 4) { + uint32_t desc; + *flags |= FLAGS_DID_OS_NOTE; + if (file_printf(ms, ", for DragonFly") == -1) + return -1; + memcpy(&desc, &nbuf[doff], sizeof(desc)); + desc = elf_getu32(swap, desc); + if (file_printf(ms, " %d.%d.%d", desc / 100000, + desc / 10000 % 10, desc % 10000) == -1) + return -1; + return 1; + } + return 0; +} + +file_private int +do_pax_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, + int swap, uint32_t namesz, uint32_t descsz, + size_t noff, size_t doff, int *flags) +{ + const char *name = RCAST(const char *, &nbuf[noff]); + + if (namesz == 4 && strcmp(name, "PaX") == 0 && + type == NT_NETBSD_PAX && descsz == 4) { + static const char *pax[] = { + "+mprotect", + "-mprotect", + "+segvguard", + "-segvguard", + "+ASLR", + "-ASLR", + }; + uint32_t desc; + size_t i; + int did = 0; + + *flags |= FLAGS_DID_NETBSD_PAX; + memcpy(&desc, &nbuf[doff], sizeof(desc)); + desc = elf_getu32(swap, desc); + + if (desc && file_printf(ms, ", PaX: ") == -1) + return -1; + + for (i = 0; i < __arraycount(pax); i++) { + if (((1 << CAST(int, i)) & desc) == 0) + continue; + if (file_printf(ms, "%s%s", did++ ? "," : "", + pax[i]) == -1) + return -1; + } + return 1; + } + return 0; +} + +file_private int +do_core_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, + int swap, uint32_t namesz, uint32_t descsz, + size_t noff, size_t doff, int *flags, size_t size, int clazz) +{ +#ifdef ELFCORE + char buf[256]; + const char *name = RCAST(const char *, &nbuf[noff]); + + int os_style = -1; + /* + * Sigh. The 2.0.36 kernel in Debian 2.1, at + * least, doesn't correctly implement name + * sections, in core dumps, as specified by + * the "Program Linking" section of "UNIX(R) System + * V Release 4 Programmer's Guide: ANSI C and + * Programming Support Tools", because my copy + * clearly says "The first 'namesz' bytes in 'name' + * contain a *null-terminated* [emphasis mine] + * character representation of the entry's owner + * or originator", but the 2.0.36 kernel code + * doesn't include the terminating null in the + * name.... + */ + if ((namesz == 4 && strncmp(name, "CORE", 4) == 0) || + (namesz == 5 && strcmp(name, "CORE") == 0)) { + os_style = OS_STYLE_SVR4; + } + + if ((namesz == 8 && strcmp(name, "FreeBSD") == 0)) { + os_style = OS_STYLE_FREEBSD; + } + + if ((namesz >= 11 && strncmp(name, "NetBSD-CORE", 11) + == 0)) { + os_style = OS_STYLE_NETBSD; + } + + if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) { + if (file_printf(ms, ", %s-style", os_style_names[os_style]) + == -1) + return -1; + *flags |= FLAGS_DID_CORE_STYLE; + *flags |= os_style; + } + + switch (os_style) { + case OS_STYLE_NETBSD: + if (type == NT_NETBSD_CORE_PROCINFO) { + char sbuf[512]; + struct NetBSD_elfcore_procinfo pi; + memset(&pi, 0, sizeof(pi)); + memcpy(&pi, nbuf + doff, MIN(descsz, sizeof(pi))); + + if (file_printf(ms, ", from '%.31s', pid=%u, uid=%u, " + "gid=%u, nlwps=%u, lwp=%u (signal %u/code %u)", + file_printable(ms, sbuf, sizeof(sbuf), + RCAST(char *, pi.cpi_name), sizeof(pi.cpi_name)), + elf_getu32(swap, CAST(uint32_t, pi.cpi_pid)), + elf_getu32(swap, pi.cpi_euid), + elf_getu32(swap, pi.cpi_egid), + elf_getu32(swap, pi.cpi_nlwps), + elf_getu32(swap, CAST(uint32_t, pi.cpi_siglwp)), + elf_getu32(swap, pi.cpi_signo), + elf_getu32(swap, pi.cpi_sigcode)) == -1) + return -1; + + *flags |= FLAGS_DID_CORE; + return 1; + } + break; + + case OS_STYLE_FREEBSD: + if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { + size_t argoff, pidoff; + + if (clazz == ELFCLASS32) + argoff = 4 + 4 + 17; + else + argoff = 4 + 4 + 8 + 17; + if (file_printf(ms, ", from '%.80s'", nbuf + doff + + argoff) == -1) + return -1; + pidoff = argoff + 81 + 2; + if (doff + pidoff + 4 <= size) { + if (file_printf(ms, ", pid=%u", + elf_getu32(swap, *RCAST(uint32_t *, (nbuf + + doff + pidoff)))) == -1) + return -1; + } + *flags |= FLAGS_DID_CORE; + } + break; + + default: + if (type == NT_PRPSINFO && *flags & FLAGS_IS_CORE) { + size_t i, j; + unsigned char c; + /* + * Extract the program name. We assume + * it to be 16 characters (that's what it + * is in SunOS 5.x and Linux). + * + * Unfortunately, it's at a different offset + * in various OSes, so try multiple offsets. + * If the characters aren't all printable, + * reject it. + */ + for (i = 0; i < NOFFSETS; i++) { + unsigned char *cname, *cp; + size_t reloffset = prpsoffsets(i); + size_t noffset = doff + reloffset; + size_t k; + for (j = 0; j < 16; j++, noffset++, + reloffset++) { + /* + * Make sure we're not past + * the end of the buffer; if + * we are, just give up. + */ + if (noffset >= size) + goto tryanother; + + /* + * Make sure we're not past + * the end of the contents; + * if we are, this obviously + * isn't the right offset. + */ + if (reloffset >= descsz) + goto tryanother; + + c = nbuf[noffset]; + if (c == '\0') { + /* + * A '\0' at the + * beginning is + * obviously wrong. + * Any other '\0' + * means we're done. + */ + if (j == 0) + goto tryanother; + else + break; + } else { + /* + * A nonprintable + * character is also + * wrong. + */ + if (!isprint(c) || isquote(c)) + goto tryanother; + } + } + /* + * Well, that worked. + */ + + /* + * Try next offsets, in case this match is + * in the middle of a string. + */ + for (k = i + 1 ; k < NOFFSETS; k++) { + size_t no; + int adjust = 1; + if (prpsoffsets(k) >= prpsoffsets(i)) + continue; + /* + * pr_fname == pr_psargs - 16 && + * non-nul-terminated fname (qemu) + */ + if (prpsoffsets(k) == + prpsoffsets(i) - 16 && j == 16) + continue; + for (no = doff + prpsoffsets(k); + no < doff + prpsoffsets(i); no++) + adjust = adjust + && isprint(nbuf[no]); + if (adjust) + i = k; + } + + cname = CAST(unsigned char *, + &nbuf[doff + prpsoffsets(i)]); + for (cp = cname; cp < nbuf + size && *cp + && isprint(*cp); cp++) + continue; + /* + * Linux apparently appends a space at the end + * of the command line: remove it. + */ + while (cp > cname && isspace(cp[-1])) + cp--; + if (file_printf(ms, ", from '%s'", + file_copystr(buf, sizeof(buf), + CAST(size_t, cp - cname), + RCAST(char *, cname))) == -1) + return -1; + *flags |= FLAGS_DID_CORE; + return 1; + + tryanother: + ; + } + } + break; + } +#endif + return 0; +} + +file_private off_t +get_offset_from_virtaddr(struct magic_set *ms, int swap, int clazz, int fd, + off_t off, int num, off_t fsize, uint64_t virtaddr) +{ + Elf32_Phdr ph32; + Elf64_Phdr ph64; + + /* + * Loop through all the program headers and find the header with + * virtual address in which the "virtaddr" belongs to. + */ + for ( ; num; num--) { + if (pread(fd, xph_addr, xph_sizeof, off) < + CAST(ssize_t, xph_sizeof)) { + if (file_printf(ms, + ", can't read elf program header at %jd", + (intmax_t)off) == -1) + return -1; + return 0; + + } + off += xph_sizeof; + + if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { + /* Perhaps warn here */ + continue; + } + + if (virtaddr >= xph_vaddr && virtaddr < xph_vaddr + xph_filesz) + return xph_offset + (virtaddr - xph_vaddr); + } + return 0; +} + +file_private size_t +get_string_on_virtaddr(struct magic_set *ms, + int swap, int clazz, int fd, off_t ph_off, int ph_num, + off_t fsize, uint64_t virtaddr, char *buf, ssize_t buflen) +{ + char *bptr; + off_t offset; + + if (buflen == 0) + return 0; + + offset = get_offset_from_virtaddr(ms, swap, clazz, fd, ph_off, ph_num, + fsize, virtaddr); + if (offset < 0 || + (buflen = pread(fd, buf, CAST(size_t, buflen), offset)) <= 0) { + (void)file_printf(ms, ", can't read elf string at %jd", + (intmax_t)offset); + return 0; + } + + buf[buflen - 1] = '\0'; + + /* We expect only printable characters, so return if buffer contains + * non-printable character before the '\0' or just '\0'. */ + for (bptr = buf; *bptr && isprint(CAST(unsigned char, *bptr)); bptr++) + continue; + if (*bptr != '\0') + return 0; + + return bptr - buf; +} + + +/*ARGSUSED*/ +file_private int +do_auxv_note(struct magic_set *ms, unsigned char *nbuf, uint32_t type, + int swap, uint32_t namesz __attribute__((__unused__)), + uint32_t descsz __attribute__((__unused__)), + size_t noff __attribute__((__unused__)), size_t doff, + int *flags, size_t size __attribute__((__unused__)), int clazz, + int fd, off_t ph_off, int ph_num, off_t fsize) +{ +#ifdef ELFCORE + Aux32Info auxv32; + Aux64Info auxv64; + size_t elsize = xauxv_sizeof; + const char *tag; + int is_string; + size_t nval, off; + + if ((*flags & (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) != + (FLAGS_IS_CORE|FLAGS_DID_CORE_STYLE)) + return 0; + + switch (*flags & FLAGS_CORE_STYLE) { + case OS_STYLE_SVR4: + if (type != NT_AUXV) + return 0; + break; +#ifdef notyet + case OS_STYLE_NETBSD: + if (type != NT_NETBSD_CORE_AUXV) + return 0; + break; + case OS_STYLE_FREEBSD: + if (type != NT_FREEBSD_PROCSTAT_AUXV) + return 0; + break; +#endif + default: + return 0; + } + + *flags |= FLAGS_DID_AUXV; + + nval = 0; + for (off = 0; off + elsize <= descsz; off += elsize) { + memcpy(xauxv_addr, &nbuf[doff + off], xauxv_sizeof); + /* Limit processing to 50 vector entries to prevent DoS */ + if (nval++ >= 50) { + file_error(ms, 0, "Too many ELF Auxv elements"); + return 1; + } + + switch(xauxv_type) { + case AT_LINUX_EXECFN: + is_string = 1; + tag = "execfn"; + break; + case AT_LINUX_PLATFORM: + is_string = 1; + tag = "platform"; + break; + case AT_LINUX_UID: + is_string = 0; + tag = "real uid"; + break; + case AT_LINUX_GID: + is_string = 0; + tag = "real gid"; + break; + case AT_LINUX_EUID: + is_string = 0; + tag = "effective uid"; + break; + case AT_LINUX_EGID: + is_string = 0; + tag = "effective gid"; + break; + default: + is_string = 0; + tag = NULL; + break; + } + + if (tag == NULL) + continue; + + if (is_string) { + char buf[256]; + ssize_t buflen; + buflen = get_string_on_virtaddr(ms, swap, clazz, fd, + ph_off, ph_num, fsize, xauxv_val, buf, sizeof(buf)); + + if (buflen == 0) + continue; + + if (file_printf(ms, ", %s: '%s'", tag, buf) == -1) + return -1; + } else { + if (file_printf(ms, ", %s: %d", tag, + CAST(int, xauxv_val)) == -1) + return -1; + } + } + return 1; +#else + return 0; +#endif +} + +file_private size_t +dodynamic(struct magic_set *ms, void *vbuf, size_t offset, size_t size, + int clazz, int swap, int *pie, size_t *need) +{ + Elf32_Dyn dh32; + Elf64_Dyn dh64; + unsigned char *dbuf = CAST(unsigned char *, vbuf); + + if (xdh_sizeof + offset > size) { + /* + * We're out of note headers. + */ + return xdh_sizeof + offset; + } + + memcpy(xdh_addr, &dbuf[offset], xdh_sizeof); + offset += xdh_sizeof; + + switch (xdh_tag) { + case DT_FLAGS_1: + *pie = 1; + if (xdh_val & DF_1_PIE) + ms->mode |= 0111; + else + ms->mode &= ~0111; + break; + case DT_NEEDED: + (*need)++; + break; + default: + break; + } + return offset; +} + + +file_private size_t +donote(struct magic_set *ms, void *vbuf, size_t offset, size_t size, + int clazz, int swap, size_t align, int *flags, uint16_t *notecount, + int fd, off_t ph_off, int ph_num, off_t fsize) +{ + Elf32_Nhdr nh32; + Elf64_Nhdr nh64; + size_t noff, doff; + uint32_t namesz, descsz; + char buf[256]; + unsigned char *nbuf = CAST(unsigned char *, vbuf); + + if (*notecount == 0) + return 0; + --*notecount; + + if (xnh_sizeof + offset > size) { + /* + * We're out of note headers. + */ + return xnh_sizeof + offset; + } + /*XXX: GCC */ + memset(&nh32, 0, sizeof(nh32)); + memset(&nh64, 0, sizeof(nh64)); + + memcpy(xnh_addr, &nbuf[offset], xnh_sizeof); + offset += xnh_sizeof; + + namesz = xnh_namesz; + descsz = xnh_descsz; + + if ((namesz == 0) && (descsz == 0)) { + /* + * We're out of note headers. + */ + return (offset >= size) ? offset : size; + } + + if (namesz & 0x80000000) { + (void)file_printf(ms, ", bad note name size %#lx", + CAST(unsigned long, namesz)); + return 0; + } + + if (descsz & 0x80000000) { + (void)file_printf(ms, ", bad note description size %#lx", + CAST(unsigned long, descsz)); + return 0; + } + + noff = offset; + doff = ELF_ALIGN(offset + namesz); + + if (offset + namesz > size) { + /* + * We're past the end of the buffer. + */ + return doff; + } + + offset = ELF_ALIGN(doff + descsz); + if (doff + descsz > size) { + /* + * We're past the end of the buffer. + */ + return (offset >= size) ? offset : size; + } + + + if ((*flags & FLAGS_DID_OS_NOTE) == 0) { + if (do_os_note(ms, nbuf, xnh_type, swap, + namesz, descsz, noff, doff, flags)) + return offset; + } + + if ((*flags & FLAGS_DID_BUILD_ID) == 0) { + if (do_bid_note(ms, nbuf, xnh_type, swap, + namesz, descsz, noff, doff, flags)) + return offset; + } + + if ((*flags & FLAGS_DID_NETBSD_PAX) == 0) { + if (do_pax_note(ms, nbuf, xnh_type, swap, + namesz, descsz, noff, doff, flags)) + return offset; + } + + if ((*flags & FLAGS_DID_CORE) == 0) { + if (do_core_note(ms, nbuf, xnh_type, swap, + namesz, descsz, noff, doff, flags, size, clazz)) + return offset; + } + + if ((*flags & FLAGS_DID_AUXV) == 0) { + if (do_auxv_note(ms, nbuf, xnh_type, swap, + namesz, descsz, noff, doff, flags, size, clazz, + fd, ph_off, ph_num, fsize)) + return offset; + } + + if (namesz == 7 && strcmp(RCAST(char *, &nbuf[noff]), "NetBSD") == 0) { + int descw, flag; + const char *str, *tag; + if (descsz > 100) + descsz = 100; + switch (xnh_type) { + case NT_NETBSD_VERSION: + return offset; + case NT_NETBSD_MARCH: + flag = FLAGS_DID_NETBSD_MARCH; + tag = "compiled for"; + break; + case NT_NETBSD_CMODEL: + flag = FLAGS_DID_NETBSD_CMODEL; + tag = "compiler model"; + break; + case NT_NETBSD_EMULATION: + flag = FLAGS_DID_NETBSD_EMULATION; + tag = "emulation:"; + break; + default: + if (*flags & FLAGS_DID_NETBSD_UNKNOWN) + return offset; + *flags |= FLAGS_DID_NETBSD_UNKNOWN; + if (file_printf(ms, ", note=%u", xnh_type) == -1) + return offset; + return offset; + } + + if (*flags & flag) + return offset; + str = RCAST(const char *, &nbuf[doff]); + descw = CAST(int, descsz); + *flags |= flag; + file_printf(ms, ", %s: %s", tag, + file_copystr(buf, sizeof(buf), descw, str)); + return offset; + } + + return offset; +} + +/* SunOS 5.x hardware capability descriptions */ +typedef struct cap_desc { + uint64_t cd_mask; + const char *cd_name; +} cap_desc_t; + +static const cap_desc_t cap_desc_sparc[] = { + { AV_SPARC_MUL32, "MUL32" }, + { AV_SPARC_DIV32, "DIV32" }, + { AV_SPARC_FSMULD, "FSMULD" }, + { AV_SPARC_V8PLUS, "V8PLUS" }, + { AV_SPARC_POPC, "POPC" }, + { AV_SPARC_VIS, "VIS" }, + { AV_SPARC_VIS2, "VIS2" }, + { AV_SPARC_ASI_BLK_INIT, "ASI_BLK_INIT" }, + { AV_SPARC_FMAF, "FMAF" }, + { AV_SPARC_FJFMAU, "FJFMAU" }, + { AV_SPARC_IMA, "IMA" }, + { 0, NULL } +}; + +static const cap_desc_t cap_desc_386[] = { + { AV_386_FPU, "FPU" }, + { AV_386_TSC, "TSC" }, + { AV_386_CX8, "CX8" }, + { AV_386_SEP, "SEP" }, + { AV_386_AMD_SYSC, "AMD_SYSC" }, + { AV_386_CMOV, "CMOV" }, + { AV_386_MMX, "MMX" }, + { AV_386_AMD_MMX, "AMD_MMX" }, + { AV_386_AMD_3DNow, "AMD_3DNow" }, + { AV_386_AMD_3DNowx, "AMD_3DNowx" }, + { AV_386_FXSR, "FXSR" }, + { AV_386_SSE, "SSE" }, + { AV_386_SSE2, "SSE2" }, + { AV_386_PAUSE, "PAUSE" }, + { AV_386_SSE3, "SSE3" }, + { AV_386_MON, "MON" }, + { AV_386_CX16, "CX16" }, + { AV_386_AHF, "AHF" }, + { AV_386_TSCP, "TSCP" }, + { AV_386_AMD_SSE4A, "AMD_SSE4A" }, + { AV_386_POPCNT, "POPCNT" }, + { AV_386_AMD_LZCNT, "AMD_LZCNT" }, + { AV_386_SSSE3, "SSSE3" }, + { AV_386_SSE4_1, "SSE4.1" }, + { AV_386_SSE4_2, "SSE4.2" }, + { 0, NULL } +}; + +file_private int +doshn(struct magic_set *ms, int clazz, int swap, int fd, off_t off, int num, + size_t size, off_t fsize, int mach, int strtab, int *flags, + uint16_t *notecount) +{ + Elf32_Shdr sh32; + Elf64_Shdr sh64; + int stripped = 1, has_debug_info = 0; + size_t nbadcap = 0; + void *nbuf; + off_t noff, coff, name_off, offs; + uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilities */ + uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilities */ + char name[50]; + ssize_t namesize; + + if (ms->flags & MAGIC_MIME) + return 0; + + if (num == 0) { + if (file_printf(ms, ", no section header") == -1) + return -1; + return 0; + } + if (size != xsh_sizeof) { + if (file_printf(ms, ", corrupted section header size") == -1) + return -1; + return 0; + } + + /* Read offset of name section to be able to read section names later */ + offs = CAST(off_t, (off + size * strtab)); + if (pread(fd, xsh_addr, xsh_sizeof, offs) < CAST(ssize_t, xsh_sizeof)) { + if (file_printf(ms, ", missing section headers at %jd", + (intmax_t)offs) == -1) + return -1; + return 0; + } + name_off = xsh_offset; + + if (fsize != SIZE_UNKNOWN && fsize < name_off) { + if (file_printf(ms, ", too large section header offset %jd", + (intmax_t)name_off) == -1) + return -1; + return 0; + } + + for ( ; num; num--) { + /* Read the name of this section. */ + offs = name_off + xsh_name; + if ((namesize = pread(fd, name, sizeof(name) - 1, offs)) + == -1) { + if (file_printf(ms, + ", can't read name of elf section at %jd", + (intmax_t)offs) == -1) + return -1; + return 0; + } + name[namesize] = '\0'; + if (strcmp(name, ".debug_info") == 0) { + has_debug_info = 1; + stripped = 0; + } + + if (pread(fd, xsh_addr, xsh_sizeof, off) < + CAST(ssize_t, xsh_sizeof)) { + if (file_printf(ms, ", can't read elf section at %jd", + (intmax_t)off) == -1) + return -1; + return 0; + } + off += size; + + /* Things we can determine before we seek */ + switch (xsh_type) { + case SHT_SYMTAB: +#if 0 + case SHT_DYNSYM: +#endif + stripped = 0; + break; + default: + if (fsize != SIZE_UNKNOWN && xsh_offset > fsize) { + /* Perhaps warn here */ + continue; + } + break; + } + + + /* Things we can determine when we seek */ + switch (xsh_type) { + case SHT_NOTE: + if (CAST(uintmax_t, (xsh_size + xsh_offset)) > + CAST(uintmax_t, fsize)) { + if (file_printf(ms, + ", note offset/size %#" INTMAX_T_FORMAT + "x+%#" INTMAX_T_FORMAT "x exceeds" + " file size %#" INTMAX_T_FORMAT "x", + CAST(uintmax_t, xsh_offset), + CAST(uintmax_t, xsh_size), + CAST(uintmax_t, fsize)) == -1) + return -1; + return 0; + } + if (xsh_size > ms->elf_shsize_max) { + file_error(ms, errno, "Note section size too " + "big (%ju > %zu)", (uintmax_t)xsh_size, + ms->elf_shsize_max); + return -1; + } + if ((nbuf = malloc(xsh_size)) == NULL) { + file_error(ms, errno, "Cannot allocate memory" + " for note"); + return -1; + } + offs = xsh_offset; + if (pread(fd, nbuf, xsh_size, offs) < + CAST(ssize_t, xsh_size)) { + free(nbuf); + if (file_printf(ms, + ", can't read elf note at %jd", + (intmax_t)offs) == -1) + return -1; + return 0; + } + + noff = 0; + for (;;) { + if (noff >= CAST(off_t, xsh_size)) + break; + noff = donote(ms, nbuf, CAST(size_t, noff), + xsh_size, clazz, swap, 4, flags, notecount, + fd, 0, 0, 0); + if (noff == 0) + break; + } + free(nbuf); + break; + case SHT_SUNW_cap: + switch (mach) { + case EM_SPARC: + case EM_SPARCV9: + case EM_IA_64: + case EM_386: + case EM_AMD64: + break; + default: + goto skip; + } + + if (nbadcap > 5) + break; + if (lseek(fd, xsh_offset, SEEK_SET) + == CAST(off_t, -1)) { + file_badseek(ms); + return -1; + } + coff = 0; + for (;;) { + Elf32_Cap cap32; + Elf64_Cap cap64; + char cbuf[/*CONSTCOND*/ + MAX(sizeof(cap32), sizeof(cap64))]; + if ((coff += xcap_sizeof) > + CAST(off_t, xsh_size)) + break; + if (read(fd, cbuf, CAST(size_t, xcap_sizeof)) != + CAST(ssize_t, xcap_sizeof)) { + file_badread(ms); + return -1; + } + if (cbuf[0] == 'A') { +#ifdef notyet + char *p = cbuf + 1; + uint32_t len, tag; + memcpy(&len, p, sizeof(len)); + p += 4; + len = getu32(swap, len); + if (memcmp("gnu", p, 3) != 0) { + if (file_printf(ms, + ", unknown capability %.3s", p) + == -1) + return -1; + break; + } + p += strlen(p) + 1; + tag = *p++; + memcpy(&len, p, sizeof(len)); + p += 4; + len = getu32(swap, len); + if (tag != 1) { + if (file_printf(ms, ", unknown gnu" + " capability tag %d", tag) + == -1) + return -1; + break; + } + // gnu attributes +#endif + break; + } + memcpy(xcap_addr, cbuf, xcap_sizeof); + switch (xcap_tag) { + case CA_SUNW_NULL: + break; + case CA_SUNW_HW_1: + cap_hw1 |= xcap_val; + break; + case CA_SUNW_SF_1: + cap_sf1 |= xcap_val; + break; + default: + if (file_printf(ms, + ", with unknown capability " + "%#" INT64_T_FORMAT "x = %#" + INT64_T_FORMAT "x", + CAST(unsigned long long, xcap_tag), + CAST(unsigned long long, xcap_val)) + == -1) + return -1; + if (nbadcap++ > 2) + coff = xsh_size; + break; + } + } + /*FALLTHROUGH*/ + skip: + default: + break; + } + } + + if (has_debug_info) { + if (file_printf(ms, ", with debug_info") == -1) + return -1; + } + if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -1) + return -1; + if (cap_hw1) { + const cap_desc_t *cdp; + switch (mach) { + case EM_SPARC: + case EM_SPARC32PLUS: + case EM_SPARCV9: + cdp = cap_desc_sparc; + break; + case EM_386: + case EM_IA_64: + case EM_AMD64: + cdp = cap_desc_386; + break; + default: + cdp = NULL; + break; + } + if (file_printf(ms, ", uses") == -1) + return -1; + if (cdp) { + while (cdp->cd_name) { + if (cap_hw1 & cdp->cd_mask) { + if (file_printf(ms, + " %s", cdp->cd_name) == -1) + return -1; + cap_hw1 &= ~cdp->cd_mask; + } + ++cdp; + } + if (cap_hw1) + if (file_printf(ms, + " unknown hardware capability %#" + INT64_T_FORMAT "x", + CAST(unsigned long long, cap_hw1)) == -1) + return -1; + } else { + if (file_printf(ms, + " hardware capability %#" INT64_T_FORMAT "x", + CAST(unsigned long long, cap_hw1)) == -1) + return -1; + } + } + if (cap_sf1) { + if (cap_sf1 & SF1_SUNW_FPUSED) { + if (file_printf(ms, + (cap_sf1 & SF1_SUNW_FPKNWN) + ? ", uses frame pointer" + : ", not known to use frame pointer") == -1) + return -1; + } + cap_sf1 &= ~SF1_SUNW_MASK; + if (cap_sf1) + if (file_printf(ms, + ", with unknown software capability %#" + INT64_T_FORMAT "x", + CAST(unsigned long long, cap_sf1)) == -1) + return -1; + } + return 0; +} + +/* + * Look through the program headers of an executable image, to determine + * if it is statically or dynamically linked. If it has a dynamic section, + * it is pie, and does not have an interpreter or needed libraries, we + * call it static pie. + */ +file_private int +dophn_exec(struct magic_set *ms, int clazz, int swap, int fd, off_t off, + int num, size_t size, off_t fsize, int sh_num, int *flags, + uint16_t *notecount) +{ + Elf32_Phdr ph32; + Elf64_Phdr ph64; + const char *linking_style; + unsigned char nbuf[BUFSIZ]; + char ibuf[BUFSIZ]; + char interp[BUFSIZ]; + ssize_t bufsize; + size_t offset, align, need = 0; + int pie = 0, dynamic = 0; + + if (num == 0) { + if (file_printf(ms, ", no program header") == -1) + return -1; + return 0; + } + if (size != xph_sizeof) { + if (file_printf(ms, ", corrupted program header size") == -1) + return -1; + return 0; + } + + interp[0] = '\0'; + for ( ; num; num--) { + int doread; + if (pread(fd, xph_addr, xph_sizeof, off) < + CAST(ssize_t, xph_sizeof)) { + if (file_printf(ms, + ", can't read elf program headers at %jd", + (intmax_t)off) == -1) + return -1; + return 0; + } + + off += size; + bufsize = 0; + align = 4; + + /* Things we can determine before we seek */ + switch (xph_type) { + case PT_DYNAMIC: + doread = 1; + break; + case PT_NOTE: + if (sh_num) /* Did this through section headers */ + continue; + if (((align = xph_align) & 0x80000000UL) != 0 || + align < 4) { + if (file_printf(ms, + ", invalid note alignment %#lx", + CAST(unsigned long, align)) == -1) + return -1; + align = 4; + } + /*FALLTHROUGH*/ + case PT_INTERP: + doread = 1; + break; + default: + doread = 0; + if (fsize != SIZE_UNKNOWN && xph_offset > fsize) { + /* Maybe warn here? */ + continue; + } + break; + } + + if (doread) { + size_t len = xph_filesz < sizeof(nbuf) ? xph_filesz + : sizeof(nbuf); + off_t offs = xph_offset; + bufsize = pread(fd, nbuf, len, offs); + if (bufsize == -1) { + if (file_printf(ms, + ", can't read section at %jd", + (intmax_t)offs) == -1) + return -1; + return 0; + } + } + + /* Things we can determine when we seek */ + switch (xph_type) { + case PT_DYNAMIC: + dynamic = 1; + offset = 0; + // Let DF_1 determine if we are PIE or not. + ms->mode &= ~0111; + for (;;) { + if (offset >= CAST(size_t, bufsize)) + break; + offset = dodynamic(ms, nbuf, offset, + CAST(size_t, bufsize), clazz, swap, + &pie, &need); + if (offset == 0) + break; + } + if (ms->flags & MAGIC_MIME) + continue; + break; + + case PT_INTERP: + need++; + if (ms->flags & MAGIC_MIME) + continue; + if (bufsize && nbuf[0]) { + nbuf[bufsize - 1] = '\0'; + memcpy(interp, nbuf, CAST(size_t, bufsize)); + } else + strlcpy(interp, "*empty*", sizeof(interp)); + break; + case PT_NOTE: + if (ms->flags & MAGIC_MIME) + return 0; + /* + * This is a PT_NOTE section; loop through all the notes + * in the section. + */ + offset = 0; + for (;;) { + if (offset >= CAST(size_t, bufsize)) + break; + offset = donote(ms, nbuf, offset, + CAST(size_t, bufsize), clazz, swap, align, + flags, notecount, fd, 0, 0, 0); + if (offset == 0) + break; + } + break; + default: + if (ms->flags & MAGIC_MIME) + continue; + break; + } + } + if (ms->flags & MAGIC_MIME) + return 0; + if (dynamic) { + if (pie && need == 0) + linking_style = "static-pie"; + else + linking_style = "dynamically"; + } else { + linking_style = "statically"; + } + if (file_printf(ms, ", %s linked", linking_style) == -1) + return -1; + if (interp[0]) + if (file_printf(ms, ", interpreter %s", file_printable(ms, + ibuf, sizeof(ibuf), interp, sizeof(interp))) == -1) + return -1; + return 0; +} + + +file_protected int +file_tryelf(struct magic_set *ms, const struct buffer *b) +{ + int fd = b->fd; + const unsigned char *buf = CAST(const unsigned char *, b->fbuf); + size_t nbytes = b->flen; + union { + int32_t l; + char c[sizeof(int32_t)]; + } u; + int clazz; + int swap; + struct stat st; + const struct stat *stp; + off_t fsize; + int flags = 0; + Elf32_Ehdr elf32hdr; + Elf64_Ehdr elf64hdr; + uint16_t type, phnum, shnum, notecount; + + if (ms->flags & (MAGIC_APPLE|MAGIC_EXTENSION)) + return 0; + /* + * ELF executables have multiple section headers in arbitrary + * file locations and thus file(1) cannot determine it from easily. + * Instead we traverse thru all section headers until a symbol table + * one is found or else the binary is stripped. + * Return immediately if it's not ELF (so we avoid pipe2file unless + * needed). + */ + if (buf[EI_MAG0] != ELFMAG0 + || (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1) + || buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3) + return 0; + + /* + * If we cannot seek, it must be a pipe, socket or fifo. + */ + if((lseek(fd, CAST(off_t, 0), SEEK_SET) == CAST(off_t, -1)) + && (errno == ESPIPE)) + fd = file_pipe2file(ms, fd, buf, nbytes); + + if (fd == -1) { + file_badread(ms); + return -1; + } + + stp = &b->st; + /* + * b->st.st_size != 0 if previous fstat() succeeded, + * which is likely, we can avoid extra stat() call. + */ + if (b->st.st_size == 0) { + stp = &st; + if (fstat(fd, &st) == -1) { + file_badread(ms); + return -1; + } + } + if (S_ISREG(stp->st_mode) || stp->st_size != 0) + fsize = stp->st_size; + else + fsize = SIZE_UNKNOWN; + + clazz = buf[EI_CLASS]; + + switch (clazz) { + case ELFCLASS32: +#undef elf_getu +#define elf_getu(a, b) elf_getu32(a, b) +#undef elfhdr +#define elfhdr elf32hdr +#include "elfclass.h" + case ELFCLASS64: +#undef elf_getu +#define elf_getu(a, b) elf_getu64(a, b) +#undef elfhdr +#define elfhdr elf64hdr +#include "elfclass.h" + default: + if (file_printf(ms, ", unknown class %d", clazz) == -1) + return -1; + break; + } + return 0; +} +#endif |