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-rw-r--r--contrib/file/readelf.c1022
1 files changed, 295 insertions, 727 deletions
diff --git a/contrib/file/readelf.c b/contrib/file/readelf.c
index 878a7636b3a98..52dcec3b72a95 100644
--- a/contrib/file/readelf.c
+++ b/contrib/file/readelf.c
@@ -1,63 +1,36 @@
-/*
- * 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"
#ifdef BUILTIN_ELF
+#include <sys/types.h>
#include <string.h>
+#include <stdio.h>
#include <ctype.h>
#include <stdlib.h>
#ifdef HAVE_UNISTD_H
#include <unistd.h>
#endif
+#include <errno.h>
#include "readelf.h"
#ifndef lint
-FILE_RCSID("@(#)$Id: readelf.c,v 1.54 2006/01/13 00:45:21 christos Exp $")
+FILE_RCSID("@(#)$Id: readelf.c,v 1.16 2000/08/05 18:18:50 christos Exp $")
#endif
#ifdef ELFCORE
-private int dophn_core(struct magic_set *, int, int, int, off_t, int, size_t);
+static void dophn_core __P((int, int, int, off_t, int, size_t));
#endif
-private int dophn_exec(struct magic_set *, int, int, int, off_t, int, size_t);
-private int doshn(struct magic_set *, int, int, int, off_t, int, size_t);
-private size_t donote(struct magic_set *, unsigned char *, size_t, size_t, int,
- int, size_t, int *);
-
-#define ELF_ALIGN(a) ((((a) + align - 1) / align) * align)
-
-#define isquote(c) (strchr("'\"`", (c)) != NULL)
+static void dophn_exec __P((int, int, int, off_t, int, size_t));
+static void doshn __P((int, int, int, off_t, int, size_t));
-private uint16_t getu16(int, uint16_t);
-private uint32_t getu32(int, uint32_t);
-private uint64_t getu64(int, uint64_t);
+static uint16_t getu16 __P((int, int));
+static uint32_t getu32 __P((int, uint32_t));
+static uint64_t getu64 __P((int, uint64_t));
-private uint16_t
-getu16(int swap, uint16_t value)
+static uint16_t
+getu16(swap, value)
+ int swap;
+ uint16_t value;
{
union {
uint16_t ui;
@@ -75,8 +48,10 @@ getu16(int swap, uint16_t value)
return value;
}
-private uint32_t
-getu32(int swap, uint32_t value)
+static uint32_t
+getu32(swap, value)
+ int swap;
+ uint32_t value;
{
union {
uint32_t ui;
@@ -96,8 +71,10 @@ getu32(int swap, uint32_t value)
return value;
}
-private uint64_t
-getu64(int swap, uint64_t value)
+static uint64_t
+getu64(swap, value)
+ int swap;
+ uint64_t value;
{
union {
uint64_t ui;
@@ -121,71 +98,101 @@ getu64(int swap, uint64_t value)
return value;
}
-#ifdef USE_ARRAY_FOR_64BIT_TYPES
-# define elf_getu64(swap, array) \
- ((swap ? ((uint64_t)getu32(swap, array[0])) << 32 : getu32(swap, array[0])) + \
- (swap ? getu32(swap, array[1]) : ((uint64_t)getu32(swap, array[1]) << 32)))
-#else
-# define elf_getu64(swap, value) getu64(swap, value)
-#endif
-
-#define xsh_addr (class == ELFCLASS32 \
+#define sh_addr (class == ELFCLASS32 \
? (void *) &sh32 \
: (void *) &sh64)
-#define xsh_sizeof (class == ELFCLASS32 \
- ? sizeof sh32 \
- : sizeof sh64)
-#define xsh_size (class == ELFCLASS32 \
- ? getu32(swap, sh32.sh_size) \
- : getu64(swap, sh64.sh_size))
-#define xsh_offset (class == ELFCLASS32 \
- ? getu32(swap, sh32.sh_offset) \
- : getu64(swap, sh64.sh_offset))
-#define xsh_type (class == ELFCLASS32 \
+#define shs_type (class == ELFCLASS32 \
? getu32(swap, sh32.sh_type) \
: getu32(swap, sh64.sh_type))
-#define xph_addr (class == ELFCLASS32 \
+#define ph_addr (class == ELFCLASS32 \
? (void *) &ph32 \
: (void *) &ph64)
-#define xph_sizeof (class == ELFCLASS32 \
- ? sizeof ph32 \
- : sizeof ph64)
-#define xph_type (class == ELFCLASS32 \
+#define ph_type (class == ELFCLASS32 \
? getu32(swap, ph32.p_type) \
: getu32(swap, ph64.p_type))
-#define xph_offset (class == ELFCLASS32 \
+#define ph_offset (class == ELFCLASS32 \
? getu32(swap, ph32.p_offset) \
: getu64(swap, ph64.p_offset))
-#define xph_align (size_t)((class == ELFCLASS32 \
- ? (off_t) (ph32.p_align ? \
- getu32(swap, ph32.p_align) : 4) \
- : (off_t) (ph64.p_align ? \
- getu64(swap, ph64.p_align) : 4)))
-#define xph_filesz (size_t)((class == ELFCLASS32 \
- ? getu32(swap, ph32.p_filesz) \
- : getu64(swap, ph64.p_filesz)))
-#define xnh_addr (class == ELFCLASS32 \
- ? (void *) &nh32 \
- : (void *) &nh64)
-#define xph_memsz (size_t)((class == ELFCLASS32 \
- ? getu32(swap, ph32.p_memsz) \
- : getu64(swap, ph64.p_memsz)))
-#define xnh_sizeof (class == ELFCLASS32 \
- ? sizeof nh32 \
- : sizeof nh64)
-#define xnh_type (class == ELFCLASS32 \
- ? getu32(swap, nh32.n_type) \
- : getu32(swap, nh64.n_type))
-#define xnh_namesz (class == ELFCLASS32 \
- ? getu32(swap, nh32.n_namesz) \
- : getu32(swap, nh64.n_namesz))
-#define xnh_descsz (class == ELFCLASS32 \
- ? getu32(swap, nh32.n_descsz) \
- : getu32(swap, nh64.n_descsz))
+#define nh_size (class == ELFCLASS32 \
+ ? sizeof *nh32 \
+ : sizeof *nh64)
+#define nh_type (class == ELFCLASS32 \
+ ? getu32(swap, nh32->n_type) \
+ : getu32(swap, nh64->n_type))
+#define nh_namesz (class == ELFCLASS32 \
+ ? getu32(swap, nh32->n_namesz) \
+ : getu32(swap, nh64->n_namesz))
+#define nh_descsz (class == ELFCLASS32 \
+ ? getu32(swap, nh32->n_descsz) \
+ : getu32(swap, nh64->n_descsz))
#define prpsoffsets(i) (class == ELFCLASS32 \
? prpsoffsets32[i] \
: prpsoffsets64[i])
+static void
+doshn(class, swap, fd, off, num, size)
+ int class;
+ int swap;
+ int fd;
+ off_t off;
+ int num;
+ size_t size;
+{
+ Elf32_Shdr sh32;
+ Elf64_Shdr sh64;
+
+ if (lseek(fd, off, SEEK_SET) == -1)
+ error("lseek failed (%s).\n", strerror(errno));
+
+ for ( ; num; num--) {
+ if (read(fd, sh_addr, size) == -1)
+ error("read failed (%s).\n", strerror(errno));
+ if (shs_type == SHT_SYMTAB /* || shs_type == SHT_DYNSYM */) {
+ (void) printf (", not stripped");
+ return;
+ }
+ }
+ (void) printf (", stripped");
+}
+
+/*
+ * 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.
+ */
+static void
+dophn_exec(class, swap, fd, off, num, size)
+ int class;
+ int swap;
+ int fd;
+ off_t off;
+ int num;
+ size_t size;
+{
+ Elf32_Phdr ph32;
+ Elf64_Phdr ph64;
+ char *linking_style = "statically";
+ char *shared_libraries = "";
+
+ if (lseek(fd, off, SEEK_SET) == -1)
+ error("lseek failed (%s).\n", strerror(errno));
+
+ for ( ; num; num--) {
+ if (read(fd, ph_addr, size) == -1)
+ error("read failed (%s).\n", strerror(errno));
+
+ switch (ph_type) {
+ case PT_DYNAMIC:
+ linking_style = "dynamically";
+ break;
+ case PT_INTERP:
+ shared_libraries = " (uses shared libs)";
+ break;
+ }
+ }
+ printf(", %s linked%s", linking_style, shared_libraries);
+}
+
#ifdef ELFCORE
size_t prpsoffsets32[] = {
8, /* FreeBSD */
@@ -195,8 +202,6 @@ size_t prpsoffsets32[] = {
};
size_t prpsoffsets64[] = {
- 16, /* FreeBSD, 64-bit */
- 40, /* Linux (tested on core from 2.4.x) */
120, /* SunOS 5.x, 64-bit */
};
@@ -225,637 +230,190 @@ size_t prpsoffsets64[] = {
* *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[] = {
- "SVR4",
- "FreeBSD",
- "NetBSD",
-};
-
-#define FLAGS_DID_CORE 1
-
-private int
-dophn_core(struct magic_set *ms, int class, int swap, int fd, off_t off,
- int num, size_t size)
+static void
+dophn_core(class, swap, fd, off, num, size)
+ int class;
+ int swap;
+ int fd;
+ off_t off;
+ int num;
+ size_t size;
{
Elf32_Phdr ph32;
+ Elf32_Nhdr *nh32;
Elf64_Phdr ph64;
- size_t offset;
- unsigned char nbuf[BUFSIZ];
- ssize_t bufsize;
- int flags = 0;
-
- if (size != xph_sizeof) {
- if (file_printf(ms, ", corrupted program header size") == -1)
- return -1;
- return 0;
- }
+ Elf64_Nhdr *nh64;
+ size_t offset, nameoffset, noffset, reloffset;
+ unsigned char c;
+ int i, j;
+ char nbuf[BUFSIZ];
+ int bufsize;
+ int is_freebsd;
/*
* Loop through all the program headers.
*/
for ( ; num; num--) {
- if (lseek(fd, off, SEEK_SET) == (off_t)-1) {
- file_badseek(ms);
- return -1;
- }
- if (read(fd, xph_addr, xph_sizeof) == -1) {
- file_badread(ms);
- return -1;
- }
+ if (lseek(fd, off, SEEK_SET) == -1)
+ error("lseek failed (%s).\n", strerror(errno));
+ if (read(fd, ph_addr, size) == -1)
+ error("read failed (%s).\n", strerror(errno));
off += size;
- if (xph_type != PT_NOTE)
+ if (ph_type != PT_NOTE)
continue;
/*
* This is a PT_NOTE section; loop through all the notes
* in the section.
*/
- if (lseek(fd, (off_t)xph_offset, SEEK_SET) == (off_t)-1) {
- file_badseek(ms);
- return -1;
- }
- bufsize = read(fd, nbuf,
- ((xph_filesz < sizeof(nbuf)) ? xph_filesz : sizeof(nbuf)));
- if (bufsize == -1) {
- file_badread(ms);
- return -1;
- }
+ if (lseek(fd, (off_t) ph_offset, SEEK_SET) == -1)
+ error("lseek failed (%s).\n", strerror(errno));
+ bufsize = read(fd, nbuf, BUFSIZ);
+ if (bufsize == -1)
+ error(": " "read failed (%s).\n", strerror(errno));
offset = 0;
for (;;) {
- if (offset >= (size_t)bufsize)
+ if (offset >= bufsize)
break;
- offset = donote(ms, nbuf, offset, (size_t)bufsize,
- class, swap, 4, &flags);
- if (offset == 0)
- break;
-
- }
- }
- return 0;
-}
-#endif
-
-private size_t
-donote(struct magic_set *ms, unsigned char *nbuf, size_t offset, size_t size,
- int class, 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;
-
- (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;
- }
-
- 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) {
- return offset;
- }
-
- 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 (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;
- default:
- if (file_printf(ms, "<unknown>") == -1)
- return size;
- }
- if (file_printf(ms, " %d.%d.%d", getu32(swap, desc[1]),
- getu32(swap, desc[2]), getu32(swap, desc[3])) == -1)
- return size;
- return size;
- }
-
- 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 = 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) {
- u_int ver_patch = (desc / 100) % 100;
- u_int ver_rel = (desc / 10000) % 100;
- u_int ver_min = (desc / 1000000) % 100;
- u_int 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) {
- file_printf(ms, "Z");
- ver_rel -= 26;
- }
- file_printf(ms, "%c", 'A' + ver_rel - 1);
- }
- }
- 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 = 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;
- }
- }
- return size;
- }
+ if (class == ELFCLASS32)
+ nh32 = (Elf32_Nhdr *)&nbuf[offset];
+ else
+ nh64 = (Elf64_Nhdr *)&nbuf[offset];
+ offset += nh_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 */
- 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 = getu32(swap, desc);
- if (file_printf(ms, " %d.%d.%d", desc / 100000,
- desc / 10000 % 10, desc % 10000) == -1)
- return size;
- return size;
- }
-
- /*
- * 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 (os_style != -1) {
- if ((*flags & FLAGS_DID_CORE) == 0) {
- if (file_printf(ms, ", %s-style",
- os_style_names[os_style]) == -1)
- return size;
- *flags |= FLAGS_DID_CORE;
- }
- }
-
- 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.
+ * Check whether this note has the name "CORE" or
+ * "FreeBSD".
*/
- (void)memcpy(&signo, &nbuf[doff + 0x08],
- sizeof(signo));
- if (file_printf(ms, " (signal %u)",
- getu32(swap, signo)) == -1)
- return size;
- return size;
- }
- break;
+ if (offset + nh_namesz >= bufsize) {
+ /*
+ * We're past the end of the buffer.
+ */
+ break;
+ }
+
+ nameoffset = offset;
+ offset += nh_namesz;
+ offset = ((offset + 3)/4)*4;
- default:
- if (xnh_type == NT_PRPSINFO) {
- 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 varous OSes, so try multiple offsets.
- * If the characters aren't all printable,
- * reject it.
+ * 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....
*/
- for (i = 0; i < NOFFSETS; i++) {
- size_t reloffset = prpsoffsets(i);
- size_t noffset = doff + reloffset;
- 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') {
+ if ((nh_namesz == 4 &&
+ strncmp(&nbuf[nameoffset], "CORE", 4) == 0) ||
+ (nh_namesz == 5 &&
+ strcmp(&nbuf[nameoffset], "CORE") == 0))
+ is_freebsd = 0;
+ else if ((nh_namesz == 8 &&
+ strcmp(&nbuf[nameoffset], "FreeBSD") == 0))
+ is_freebsd = 1;
+ else
+ continue;
+ if (nh_type == NT_PRPSINFO) {
+ /*
+ * 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 varous OSes, so try multiple offsets.
+ * If the characters aren't all printable,
+ * reject it.
+ */
+ for (i = 0; i < NOFFSETS; i++) {
+ reloffset = prpsoffsets(i);
+ noffset = offset + reloffset;
+ for (j = 0; j < 16;
+ j++, noffset++, reloffset++) {
/*
- * A '\0' at the
- * beginning is
- * obviously wrong.
- * Any other '\0'
- * means we're done.
+ * Make sure we're not past
+ * the end of the buffer; if
+ * we are, just give up.
*/
- if (j == 0)
+ if (noffset >= bufsize)
goto tryanother;
- else
- break;
- } else {
+
/*
- * A nonprintable
- * character is also
- * wrong.
+ * Make sure we're not past
+ * the end of the contents;
+ * if we are, this obviously
+ * isn't the right offset.
*/
- if (!isprint(c) || isquote(c))
+ if (reloffset >= nh_descsz)
goto tryanother;
- }
- }
- /*
- * Well, that worked.
- */
- if (file_printf(ms, ", from '%.16s'",
- &nbuf[doff + prpsoffsets(i)]) == -1)
- return size;
- return size;
-
- tryanother:
- ;
- }
- }
- break;
- }
-#endif
- return offset;
-}
-
-private int
-doshn(struct magic_set *ms, int class, int swap, int fd, off_t off, int num,
- size_t size)
-{
- Elf32_Shdr sh32;
- Elf64_Shdr sh64;
- int stripped = 1;
- int flags = 0;
- void *nbuf;
- off_t noff;
-
- if (size != xsh_sizeof) {
- if (file_printf(ms, ", corrupted section header size") == -1)
- return -1;
- return 0;
- }
-
- if (lseek(fd, off, SEEK_SET) == (off_t)-1) {
- file_badseek(ms);
- return -1;
- }
- for ( ; num; num--) {
- if (read(fd, xsh_addr, xsh_sizeof) == -1) {
- file_badread(ms);
- return -1;
- }
- switch (xsh_type) {
- case SHT_SYMTAB:
-#if 0
- case SHT_DYNSYM:
-#endif
- stripped = 0;
- break;
- case SHT_NOTE:
- if ((off = lseek(fd, (off_t)0, SEEK_CUR)) ==
- (off_t)-1) {
- file_badread(ms);
- return -1;
- }
- if ((nbuf = malloc((size_t)xsh_size)) == NULL) {
- file_error(ms, errno, "Cannot allocate memory"
- " for note");
- return -1;
- }
- if ((noff = lseek(fd, (off_t)xsh_offset, SEEK_SET)) ==
- (off_t)-1) {
- file_badread(ms);
- free(nbuf);
- return -1;
- }
- if (read(fd, nbuf, (size_t)xsh_size) !=
- (ssize_t)xsh_size) {
- free(nbuf);
- file_badread(ms);
- return -1;
- }
+ 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.
+ */
+#define isquote(c) (strchr("'\"`", (c)) != NULL)
+ if (!isprint(c) ||
+ isquote(c))
+ goto tryanother;
+ }
+ }
- noff = 0;
- for (;;) {
- if (noff >= (size_t)xsh_size)
- break;
- noff = donote(ms, nbuf, (size_t)noff,
- (size_t)xsh_size, class, swap, 4,
- &flags);
- if (noff == 0)
+ /*
+ * Well, that worked.
+ */
+ printf(", from '%.16s'",
+ &nbuf[offset + prpsoffsets(i)]);
break;
- }
- if ((lseek(fd, off, SEEK_SET)) == (off_t)-1) {
- free(nbuf);
- file_badread(ms);
- return -1;
- }
- free(nbuf);
- break;
- }
- }
- if (file_printf(ms, ", %sstripped", stripped ? "" : "not ") == -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 class, int swap, int fd, off_t off,
- int num, size_t size)
-{
- Elf32_Phdr ph32;
- Elf64_Phdr ph64;
- const char *linking_style = "statically";
- const char *shared_libraries = "";
- unsigned char nbuf[BUFSIZ];
- int bufsize;
- size_t offset, align;
- off_t savedoffset;
- int flags = 0;
-
- if (size != xph_sizeof) {
- if (file_printf(ms, ", corrupted program header size") == -1)
- return -1;
- return 0;
- }
- if (lseek(fd, off, SEEK_SET) == (off_t)-1) {
- file_badseek(ms);
- return -1;
- }
- for ( ; num; num--) {
- if (read(fd, xph_addr, xph_sizeof) == -1) {
- file_badread(ms);
- return -1;
- }
- if ((savedoffset = lseek(fd, (off_t)0, SEEK_CUR)) == (off_t)-1) {
- file_badseek(ms);
- return -1;
- }
-
- switch (xph_type) {
- case PT_DYNAMIC:
- linking_style = "dynamically";
- break;
- case PT_INTERP:
- shared_libraries = " (uses shared libs)";
- break;
- case PT_NOTE:
- if ((align = xph_align) & 0x80000000) {
- if (file_printf(ms,
- ", invalid note alignment 0x%lx",
- (unsigned long)align) == -1)
- return -1;
- align = 4;
- }
- /*
- * This is a PT_NOTE section; loop through all the notes
- * in the section.
- */
- if (lseek(fd, (off_t)xph_offset, SEEK_SET)
- == (off_t)-1) {
- file_badseek(ms);
- return -1;
- }
- bufsize = read(fd, nbuf, ((xph_filesz < sizeof(nbuf)) ?
- xph_filesz : sizeof(nbuf)));
- 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, class, swap, align,
- &flags);
- if (offset == 0)
- break;
- }
- if (lseek(fd, savedoffset, SEEK_SET) == (off_t)-1) {
- file_badseek(ms);
- return -1;
+ tryanother:
+ ;
+ }
+ break;
}
- break;
+ offset += nh_descsz;
+ offset = ((offset + 3)/4)*4;
}
+ out:
+ ;
}
- if (file_printf(ms, ", %s linked%s", linking_style, shared_libraries)
- == -1)
- return -1;
- return 0;
}
+#endif
-
-protected int
-file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf,
- size_t nbytes)
+void
+tryelf(fd, buf, nbytes)
+ int fd;
+ unsigned char *buf;
+ int nbytes;
{
union {
- int32_t l;
- char c[sizeof (int32_t)];
+ int32 l;
+ char c[sizeof (int32)];
} u;
int class;
int swap;
/*
- * 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);
-
- /*
* 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
@@ -864,7 +422,7 @@ file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf,
if (buf[EI_MAG0] != ELFMAG0
|| (buf[EI_MAG1] != ELFMAG1 && buf[EI_MAG1] != OLFMAG1)
|| buf[EI_MAG2] != ELFMAG2 || buf[EI_MAG3] != ELFMAG3)
- return 0;
+ return;
class = buf[4];
@@ -872,78 +430,88 @@ file_tryelf(struct magic_set *ms, int fd, const unsigned char *buf,
if (class == ELFCLASS32) {
Elf32_Ehdr elfhdr;
if (nbytes <= sizeof (Elf32_Ehdr))
- return 0;
+ return;
u.l = 1;
(void) memcpy(&elfhdr, buf, sizeof elfhdr);
- swap = (u.c[sizeof(int32_t) - 1] + 1) != elfhdr.e_ident[5];
+ swap = (u.c[sizeof(int32) - 1] + 1) != elfhdr.e_ident[5];
- if (getu16(swap, elfhdr.e_type) == ET_CORE) {
+ if (getu16(swap, elfhdr.e_type) == ET_CORE)
#ifdef ELFCORE
- if (dophn_core(ms, class, swap, fd,
- (off_t)getu32(swap, elfhdr.e_phoff),
- getu16(swap, elfhdr.e_phnum),
- (size_t)getu16(swap, elfhdr.e_phentsize)) == -1)
- return -1;
+ dophn_core(class, swap,
+ fd,
+ getu32(swap, elfhdr.e_phoff),
+ getu16(swap, elfhdr.e_phnum),
+ getu16(swap, elfhdr.e_phentsize));
#else
;
#endif
- } else {
+ else {
if (getu16(swap, elfhdr.e_type) == ET_EXEC) {
- if (dophn_exec(ms, class, swap,
- fd, (off_t)getu32(swap, elfhdr.e_phoff),
- getu16(swap, elfhdr.e_phnum),
- (size_t)getu16(swap, elfhdr.e_phentsize))
- == -1)
- return -1;
+ dophn_exec(class, swap,
+ fd,
+ getu32(swap, elfhdr.e_phoff),
+ getu16(swap, elfhdr.e_phnum),
+ getu16(swap, elfhdr.e_phentsize));
}
- if (doshn(ms, class, swap, fd,
- (off_t)getu32(swap, elfhdr.e_shoff),
- getu16(swap, elfhdr.e_shnum),
- (size_t)getu16(swap, elfhdr.e_shentsize)) == -1)
- return -1;
+ doshn(class, swap,
+ fd,
+ getu32(swap, elfhdr.e_shoff),
+ getu16(swap, elfhdr.e_shnum),
+ getu16(swap, elfhdr.e_shentsize));
}
- return 1;
+ return;
}
if (class == ELFCLASS64) {
Elf64_Ehdr elfhdr;
if (nbytes <= sizeof (Elf64_Ehdr))
- return 0;
+ return;
u.l = 1;
(void) memcpy(&elfhdr, buf, sizeof elfhdr);
- swap = (u.c[sizeof(int32_t) - 1] + 1) != elfhdr.e_ident[5];
+ swap = (u.c[sizeof(int32) - 1] + 1) != elfhdr.e_ident[5];
- if (getu16(swap, elfhdr.e_type) == ET_CORE) {
+ if (getu16(swap, elfhdr.e_type) == ET_CORE)
#ifdef ELFCORE
- if (dophn_core(ms, class, swap, fd,
- (off_t)elf_getu64(swap, elfhdr.e_phoff),
- getu16(swap, elfhdr.e_phnum),
- (size_t)getu16(swap, elfhdr.e_phentsize)) == -1)
- return -1;
+ dophn_core(class, swap,
+ fd,
+#ifdef USE_ARRAY_FOR_64BIT_TYPES
+ getu32(swap, elfhdr.e_phoff[1]),
+#else
+ getu64(swap, elfhdr.e_phoff),
+#endif
+ getu16(swap, elfhdr.e_phnum),
+ getu16(swap, elfhdr.e_phentsize));
#else
;
#endif
- } else {
+ else
+ {
if (getu16(swap, elfhdr.e_type) == ET_EXEC) {
- if (dophn_exec(ms, class, swap, fd,
- (off_t)elf_getu64(swap, elfhdr.e_phoff),
- getu16(swap, elfhdr.e_phnum),
- (size_t)getu16(swap, elfhdr.e_phentsize))
- == -1)
- return -1;
+ dophn_exec(class, swap,
+ fd,
+#ifdef USE_ARRAY_FOR_64BIT_TYPES
+ getu32(swap, elfhdr.e_phoff[1]),
+#else
+ getu64(swap, elfhdr.e_phoff),
+#endif
+ getu16(swap, elfhdr.e_phnum),
+ getu16(swap, elfhdr.e_phentsize));
}
- if (doshn(ms, class, swap, fd,
- (off_t)elf_getu64(swap, elfhdr.e_shoff),
- getu16(swap, elfhdr.e_shnum),
- (size_t)getu16(swap, elfhdr.e_shentsize)) == -1)
- return -1;
+ doshn(class, swap,
+ fd,
+#ifdef USE_ARRAY_FOR_64BIT_TYPES
+ getu32(swap, elfhdr.e_shoff[1]),
+#else
+ getu64(swap, elfhdr.e_shoff),
+#endif
+ getu16(swap, elfhdr.e_shnum),
+ getu16(swap, elfhdr.e_shentsize));
}
- return 1;
+ return;
}
- return 0;
}
#endif
generated by cgit v1.2.3 (git 2.25.1) at 2025-11-06 15:57:59 +0000