diff options
Diffstat (limited to 'src/readelf.c')
| -rw-r--r-- | src/readelf.c | 1208 |
1 files changed, 1208 insertions, 0 deletions
diff --git a/src/readelf.c b/src/readelf.c new file mode 100644 index 0000000..398056f --- /dev/null +++ b/src/readelf.c @@ -0,0 +1,1208 @@ +/* + * 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 1.96 2013/02/22 01:35:49 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 +private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t, + off_t, int *); +#endif +private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t, + off_t, int *, int); +private int doshn(struct magic_set *, int, int, int, off_t, int, size_t, + off_t, int *, int, int); +private size_t donote(struct magic_set *, void *, size_t, size_t, int, + int, size_t, int *); + +#define ELF_ALIGN(a) ((((a) + align - 1) / align) * align) + +#define isquote(c) (strchr("'\"`", (c)) != NULL) + +private uint16_t getu16(int, uint16_t); +private uint32_t getu32(int, uint32_t); +#ifndef USE_ARRAY_FOR_64BIT_TYPES +private uint64_t getu64(int, uint64_t); +#endif + +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; +} + +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; +} + +#ifndef USE_ARRAY_FOR_64BIT_TYPES +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; +} +#endif + +#define elf_getu16(swap, value) getu16(swap, value) +#define elf_getu32(swap, value) getu32(swap, value) +#ifdef USE_ARRAY_FOR_64BIT_TYPES +# define elf_getu64(swap, array) \ + ((swap ? ((uint64_t)elf_getu32(swap, array[0])) << 32 \ + : elf_getu32(swap, array[0])) + \ + (swap ? elf_getu32(swap, array[1]) : \ + ((uint64_t)elf_getu32(swap, array[1]) << 32))) +#else +# define elf_getu64(swap, value) getu64(swap, value) +#endif + +#define xsh_addr (clazz == ELFCLASS32 \ + ? (void *)&sh32 \ + : (void *)&sh64) +#define xsh_sizeof (clazz == ELFCLASS32 \ + ? sizeof(sh32) \ + : sizeof(sh64)) +#define xsh_size (size_t)(clazz == ELFCLASS32 \ + ? elf_getu32(swap, sh32.sh_size) \ + : elf_getu64(swap, sh64.sh_size)) +#define xsh_offset (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 \ + ? (void *) &ph32 \ + : (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 (off_t)(clazz == ELFCLASS32 \ + ? elf_getu32(swap, ph32.p_offset) \ + : elf_getu64(swap, ph64.p_offset)) +#define xph_align (size_t)((clazz == ELFCLASS32 \ + ? (off_t) (ph32.p_align ? \ + elf_getu32(swap, ph32.p_align) : 4) \ + : (off_t) (ph64.p_align ? \ + elf_getu64(swap, ph64.p_align) : 4))) +#define xph_filesz (size_t)((clazz == ELFCLASS32 \ + ? elf_getu32(swap, ph32.p_filesz) \ + : elf_getu64(swap, ph64.p_filesz))) +#define xnh_addr (clazz == ELFCLASS32 \ + ? (void *)&nh32 \ + : (void *)&nh64) +#define xph_memsz (size_t)((clazz == ELFCLASS32 \ + ? elf_getu32(swap, ph32.p_memsz) \ + : elf_getu64(swap, ph64.p_memsz))) +#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 prpsoffsets(i) (clazz == ELFCLASS32 \ + ? prpsoffsets32[i] \ + : prpsoffsets64[i]) +#define xcap_addr (clazz == ELFCLASS32 \ + ? (void *)&cap32 \ + : (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)) + +#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 2.0.36 (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 (sizeof prpsoffsets32 / sizeof prpsoffsets32[0]) +#define NOFFSETS64 (sizeof prpsoffsets64 / sizeof prpsoffsets64[0]) + +#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 + +private const char os_style_names[][8] = { + "SVR4", + "FreeBSD", + "NetBSD", +}; + +#define FLAGS_DID_CORE 0x01 +#define FLAGS_DID_NOTE 0x02 +#define FLAGS_DID_BUILD_ID 0x04 +#define FLAGS_DID_CORE_STYLE 0x08 +#define FLAGS_IS_CORE 0x10 + +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) +{ + Elf32_Phdr ph32; + Elf64_Phdr ph64; + size_t offset, len; + unsigned char nbuf[BUFSIZ]; + ssize_t bufsize; + + 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) == -1) { + file_badread(ms); + return -1; + } + off += size; + + if (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); + if ((bufsize = pread(fd, nbuf, len, xph_offset)) == -1) { + file_badread(ms); + return -1; + } + offset = 0; + for (;;) { + if (offset >= (size_t)bufsize) + break; + offset = donote(ms, nbuf, offset, (size_t)bufsize, + clazz, swap, 4, flags); + if (offset == 0) + break; + + } + } + return 0; +} +#endif + +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) +{ + Elf32_Nhdr nh32; + Elf64_Nhdr nh64; + size_t noff, doff; +#ifdef ELFCORE + int os_style = -1; +#endif + uint32_t namesz, descsz; + unsigned char *nbuf = CAST(unsigned char *, vbuf); + + (void)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 0x%lx", + (unsigned long)namesz); + return offset; + } + + if (descsz & 0x80000000) { + (void)file_printf(ms, ", bad note description size 0x%lx", + (unsigned long)descsz); + return offset; + } + + + 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_NOTE|FLAGS_DID_BUILD_ID)) == + (FLAGS_DID_NOTE|FLAGS_DID_BUILD_ID)) + goto core; + + if (namesz == 5 && strcmp((char *)&nbuf[noff], "SuSE") == 0 && + xnh_type == NT_GNU_VERSION && descsz == 2) { + file_printf(ms, ", for SuSE %d.%d", nbuf[doff], nbuf[doff + 1]); + } + if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && + xnh_type == NT_GNU_VERSION && descsz == 16) { + uint32_t desc[4]; + (void)memcpy(desc, &nbuf[doff], sizeof(desc)); + + if (file_printf(ms, ", for GNU/") == -1) + return size; + switch (elf_getu32(swap, desc[0])) { + case GNU_OS_LINUX: + if (file_printf(ms, "Linux") == -1) + return size; + break; + case GNU_OS_HURD: + if (file_printf(ms, "Hurd") == -1) + return size; + break; + case GNU_OS_SOLARIS: + if (file_printf(ms, "Solaris") == -1) + return size; + break; + case GNU_OS_KFREEBSD: + if (file_printf(ms, "kFreeBSD") == -1) + return size; + break; + case GNU_OS_KNETBSD: + if (file_printf(ms, "kNetBSD") == -1) + return size; + break; + default: + if (file_printf(ms, "<unknown>") == -1) + return size; + } + if (file_printf(ms, " %d.%d.%d", elf_getu32(swap, desc[1]), + elf_getu32(swap, desc[2]), elf_getu32(swap, desc[3])) == -1) + return size; + *flags |= FLAGS_DID_NOTE; + return size; + } + + if (namesz == 4 && strcmp((char *)&nbuf[noff], "GNU") == 0 && + xnh_type == NT_GNU_BUILD_ID && (descsz == 16 || descsz == 20)) { + uint8_t desc[20]; + uint32_t i; + if (file_printf(ms, ", BuildID[%s]=", descsz == 16 ? "md5/uuid" : + "sha1") == -1) + return size; + (void)memcpy(desc, &nbuf[doff], descsz); + for (i = 0; i < descsz; i++) + if (file_printf(ms, "%02x", desc[i]) == -1) + return size; + *flags |= FLAGS_DID_BUILD_ID; + } + + if (namesz == 7 && strcmp((char *)&nbuf[noff], "NetBSD") == 0 && + xnh_type == NT_NETBSD_VERSION && descsz == 4) { + uint32_t desc; + (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); + desc = elf_getu32(swap, desc); + + if (file_printf(ms, ", for NetBSD") == -1) + return size; + /* + * 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 size; + if (ver_rel == 0 && ver_patch != 0) { + if (file_printf(ms, ".%u", ver_patch) == -1) + return size; + } else if (ver_rel != 0) { + while (ver_rel > 26) { + if (file_printf(ms, "Z") == -1) + return size; + ver_rel -= 26; + } + if (file_printf(ms, "%c", 'A' + ver_rel - 1) + == -1) + return size; + } + } + *flags |= FLAGS_DID_NOTE; + return size; + } + + if (namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0 && + xnh_type == NT_FREEBSD_VERSION && descsz == 4) { + uint32_t desc; + (void)memcpy(&desc, &nbuf[doff], sizeof(desc)); + desc = elf_getu32(swap, desc); + if (file_printf(ms, ", for FreeBSD") == -1) + return size; + + /* + * 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 size; + } else if (desc < 460100) { + if (file_printf(ms, " %d.%d", desc / 100000, + desc / 10000 % 10) == -1) + return size; + if (desc / 1000 % 10 > 0) + if (file_printf(ms, ".%d", desc / 1000 % 10) + == -1) + return size; + if ((desc % 1000 > 0) || (desc % 100000 == 0)) + if (file_printf(ms, " (%d)", desc) == -1) + return size; + } else if (desc < 500000) { + if (file_printf(ms, " %d.%d", desc / 100000, + desc / 10000 % 10 + desc / 1000 % 10) == -1) + return size; + if (desc / 100 % 10 > 0) { + if (file_printf(ms, " (%d)", desc) == -1) + return size; + } else if (desc / 10 % 10 > 0) { + if (file_printf(ms, ".%d", desc / 10 % 10) + == -1) + return size; + } + } else { + if (file_printf(ms, " %d.%d", desc / 100000, + desc / 1000 % 100) == -1) + return size; + if ((desc / 100 % 10 > 0) || + (desc % 100000 / 100 == 0)) { + if (file_printf(ms, " (%d)", desc) == -1) + return size; + } else if (desc / 10 % 10 > 0) { + if (file_printf(ms, ".%d", desc / 10 % 10) + == -1) + return size; + } + } + *flags |= FLAGS_DID_NOTE; + return size; + } + + if (namesz == 8 && strcmp((char *)&nbuf[noff], "OpenBSD") == 0 && + xnh_type == NT_OPENBSD_VERSION && descsz == 4) { + if (file_printf(ms, ", for OpenBSD") == -1) + return size; + /* Content of note is always 0 */ + *flags |= FLAGS_DID_NOTE; + return size; + } + + if (namesz == 10 && strcmp((char *)&nbuf[noff], "DragonFly") == 0 && + xnh_type == NT_DRAGONFLY_VERSION && descsz == 4) { + uint32_t desc; + if (file_printf(ms, ", for DragonFly") == -1) + return size; + (void)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 size; + *flags |= FLAGS_DID_NOTE; + return size; + } + +core: + /* + * 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((char *)&nbuf[noff], "CORE", 4) == 0) || + (namesz == 5 && strcmp((char *)&nbuf[noff], "CORE") == 0)) { + os_style = OS_STYLE_SVR4; + } + + if ((namesz == 8 && strcmp((char *)&nbuf[noff], "FreeBSD") == 0)) { + os_style = OS_STYLE_FREEBSD; + } + + if ((namesz >= 11 && strncmp((char *)&nbuf[noff], "NetBSD-CORE", 11) + == 0)) { + os_style = OS_STYLE_NETBSD; + } + +#ifdef ELFCORE + if ((*flags & FLAGS_DID_CORE) != 0) + return size; + + if (os_style != -1 && (*flags & FLAGS_DID_CORE_STYLE) == 0) { + if (file_printf(ms, ", %s-style", os_style_names[os_style]) + == -1) + return size; + *flags |= FLAGS_DID_CORE_STYLE; + } + + switch (os_style) { + case OS_STYLE_NETBSD: + if (xnh_type == NT_NETBSD_CORE_PROCINFO) { + uint32_t signo; + /* + * Extract the program name. It is at + * offset 0x7c, and is up to 32-bytes, + * including the terminating NUL. + */ + if (file_printf(ms, ", from '%.31s'", + &nbuf[doff + 0x7c]) == -1) + return size; + + /* + * Extract the signal number. It is at + * offset 0x08. + */ + (void)memcpy(&signo, &nbuf[doff + 0x08], + sizeof(signo)); + if (file_printf(ms, " (signal %u)", + elf_getu32(swap, signo)) == -1) + return size; + *flags |= FLAGS_DID_CORE; + return size; + } + break; + + default: + if (xnh_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; + for (no = doff + prpsoffsets(k); + no < doff + prpsoffsets(i); no++) + adjust = adjust + && isprint(nbuf[no]); + if (adjust) + i = k; + } + + cname = (unsigned char *) + &nbuf[doff + prpsoffsets(i)]; + for (cp = cname; *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'", + (int)(cp - cname), cname) == -1) + return size; + *flags |= FLAGS_DID_CORE; + return size; + + tryanother: + ; + } + } + break; + } +#endif + 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 } +}; + +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 *flags, int mach, int strtab) +{ + Elf32_Shdr sh32; + Elf64_Shdr sh64; + int stripped = 1; + void *nbuf; + off_t noff, coff, name_off; + uint64_t cap_hw1 = 0; /* SunOS 5.x hardware capabilites */ + uint64_t cap_sf1 = 0; /* SunOS 5.x software capabilites */ + char name[50]; + + 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 */ + if (pread(fd, xsh_addr, xsh_sizeof, off + size * strtab) == -1) { + file_badread(ms); + return -1; + } + name_off = xsh_offset; + + for ( ; num; num--) { + /* Read the name of this section. */ + if (pread(fd, name, sizeof(name), name_off + xsh_name) == -1) { + file_badread(ms); + return -1; + } + name[sizeof(name) - 1] = '\0'; + if (strcmp(name, ".debug_info") == 0) + stripped = 0; + + if (pread(fd, xsh_addr, xsh_sizeof, off) == -1) { + file_badread(ms); + return -1; + } + 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 (xsh_offset > fsize) { + /* Perhaps warn here */ + continue; + } + break; + } + + /* Things we can determine when we seek */ + switch (xsh_type) { + case SHT_NOTE: + if ((nbuf = malloc(xsh_size)) == NULL) { + file_error(ms, errno, "Cannot allocate memory" + " for note"); + return -1; + } + if (pread(fd, nbuf, xsh_size, xsh_offset) == -1) { + file_badread(ms); + free(nbuf); + return -1; + } + + noff = 0; + for (;;) { + if (noff >= (off_t)xsh_size) + break; + noff = donote(ms, nbuf, (size_t)noff, + xsh_size, clazz, swap, 4, flags); + 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 (lseek(fd, xsh_offset, SEEK_SET) == (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) > (off_t)xsh_size) + break; + if (read(fd, cbuf, (size_t)xcap_sizeof) != + (ssize_t)xcap_sizeof) { + file_badread(ms); + return -1; + } + (void)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 " + "0x%" INT64_T_FORMAT "x = 0x%" + INT64_T_FORMAT "x", + (unsigned long long)xcap_tag, + (unsigned long long)xcap_val) == -1) + return -1; + break; + } + } + /*FALLTHROUGH*/ + skip: + default: + break; + } + } + + 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 0x%" + INT64_T_FORMAT "x", + (unsigned long long)cap_hw1) == -1) + return -1; + } else { + if (file_printf(ms, + " hardware capability 0x%" INT64_T_FORMAT "x", + (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 0x%" + INT64_T_FORMAT "x", + (unsigned long long)cap_sf1) == -1) + return -1; + } + return 0; +} + +/* + * Look through the program headers of an executable image, searching + * for a PT_INTERP section; if one is found, it's dynamically linked, + * otherwise it's statically linked. + */ +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 *flags, int sh_num) +{ + Elf32_Phdr ph32; + Elf64_Phdr ph64; + const char *linking_style = "statically"; + const char *shared_libraries = ""; + unsigned char nbuf[BUFSIZ]; + ssize_t bufsize; + size_t offset, align, len; + + if (size != xph_sizeof) { + if (file_printf(ms, ", corrupted program header size") == -1) + return -1; + return 0; + } + + for ( ; num; num--) { + if (pread(fd, xph_addr, xph_sizeof, off) == -1) { + file_badread(ms); + return -1; + } + + off += size; + + /* Things we can determine before we seek */ + switch (xph_type) { + case PT_DYNAMIC: + linking_style = "dynamically"; + break; + case PT_INTERP: + shared_libraries = " (uses shared libs)"; + break; + default: + if (xph_offset > fsize) { + /* Maybe warn here? */ + continue; + } + break; + } + + /* Things we can determine when we seek */ + switch (xph_type) { + case PT_NOTE: + if ((align = xph_align) & 0x80000000UL) { + if (file_printf(ms, + ", invalid note alignment 0x%lx", + (unsigned long)align) == -1) + return -1; + align = 4; + } + if (sh_num) + break; + /* + * This is a PT_NOTE section; loop through all the notes + * in the section. + */ + len = xph_filesz < sizeof(nbuf) ? xph_filesz + : sizeof(nbuf); + bufsize = pread(fd, nbuf, len, xph_offset); + if (bufsize == -1) { + file_badread(ms); + return -1; + } + offset = 0; + for (;;) { + if (offset >= (size_t)bufsize) + break; + offset = donote(ms, nbuf, offset, + (size_t)bufsize, clazz, swap, align, + flags); + if (offset == 0) + break; + } + break; + default: + break; + } + } + if (file_printf(ms, ", %s linked%s", linking_style, shared_libraries) + == -1) + return -1; + return 0; +} + + +protected int +file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf, + size_t nbytes) +{ + union { + int32_t l; + char c[sizeof (int32_t)]; + } u; + int clazz; + int swap; + struct stat st; + off_t fsize; + int flags = 0; + Elf32_Ehdr elf32hdr; + Elf64_Ehdr elf64hdr; + uint16_t type; + + if (ms->flags & (MAGIC_MIME|MAGIC_APPLE)) + 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, (off_t)0, SEEK_SET) == (off_t)-1) && (errno == ESPIPE)) + fd = file_pipe2file(ms, fd, buf, nbytes); + + if (fstat(fd, &st) == -1) { + file_badread(ms); + return -1; + } + fsize = st.st_size; + + 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 |