From dda3ccd4b416b54950e55d1291239fc437ba0580 Mon Sep 17 00:00:00 2001 From: Christos Zoulas Date: Wed, 12 Mar 2003 21:16:31 +0000 Subject: [PATCH] centralize notes processing. --- src/readelf.c | 639 +++++++++++++++++++++++++------------------------- 1 file changed, 320 insertions(+), 319 deletions(-) diff --git a/src/readelf.c b/src/readelf.c index 2259558b..b9387091 100644 --- a/src/readelf.c +++ b/src/readelf.c @@ -11,7 +11,7 @@ #include "readelf.h" #ifndef lint -FILE_RCSID("@(#)$Id: readelf.c,v 1.26 2003/02/25 15:30:00 christos Exp $") +FILE_RCSID("@(#)$Id: readelf.c,v 1.27 2003/03/12 21:16:31 christos Exp $") #endif #ifdef ELFCORE @@ -19,6 +19,9 @@ static void dophn_core(int, int, int, off_t, int, size_t); #endif static void dophn_exec(int, int, int, off_t, int, size_t); static void doshn(int, int, int, off_t, int, size_t); +static size_t donote(unsigned char *, size_t, size_t, int, int, int); + +#define ELF_ALIGN(a) ((((a) + align - 1) / align) * align) static uint16_t getu16(int, uint16_t); static uint32_t getu32(int, uint32_t); @@ -129,186 +132,6 @@ getu64(int swap, uint64_t value) ? prpsoffsets32[i] \ : prpsoffsets64[i]) -static void -doshn(int class, int swap, int fd, off_t off, int num, size_t size) -{ - Elf32_Shdr sh32; - Elf64_Shdr sh64; - - if (size != sh_size) - error("corrupted section header size.\n"); - - if (lseek(fd, off, SEEK_SET) == -1) - error("lseek failed (%s).\n", strerror(errno)); - - for ( ; num; num--) { - if (read(fd, sh_addr, sh_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(int class, int swap, int fd, off_t off, int num, size_t size) -{ - Elf32_Phdr ph32; - Elf32_Nhdr *nh32 = NULL; - Elf64_Phdr ph64; - Elf64_Nhdr *nh64 = NULL; - char *linking_style = "statically"; - char *shared_libraries = ""; - char nbuf[BUFSIZ]; - int bufsize; - size_t offset, nameoffset; - off_t savedoffset; - - if (size != ph_size) - error("corrupted program header size.\n"); - if (lseek(fd, off, SEEK_SET) == -1) - error("lseek failed (%s).\n", strerror(errno)); - - for ( ; num; num--) { - if (read(fd, ph_addr, ph_size) == -1) - error("read failed (%s).\n", strerror(errno)); - if ((savedoffset = lseek(fd, 0, SEEK_CUR)) == -1) - error("lseek failed (%s).\n", strerror(errno)); - - switch (ph_type) { - case PT_DYNAMIC: - linking_style = "dynamically"; - break; - case PT_INTERP: - shared_libraries = " (uses shared libs)"; - break; - case PT_NOTE: - /* - * This is a PT_NOTE section; loop through all the notes - * in the section. - */ - if (lseek(fd, (off_t) ph_offset, SEEK_SET) == -1) - error("lseek failed (%s).\n", strerror(errno)); - bufsize = read(fd, nbuf, sizeof(nbuf)); - if (bufsize == -1) - error(": " "read failed (%s).\n", - strerror(errno)); - offset = 0; - for (;;) { - if (offset >= bufsize) - break; - if (class == ELFCLASS32) - nh32 = (Elf32_Nhdr *)&nbuf[offset]; - else - nh64 = (Elf64_Nhdr *)&nbuf[offset]; - offset += nh_size; - - if (offset + nh_namesz >= bufsize) { - /* - * We're past the end of the buffer. - */ - break; - } - - nameoffset = offset; - offset += nh_namesz; - offset = ((offset+ph_align-1)/ph_align)*ph_align; - - if ((nh_namesz == 0) && (nh_descsz == 0)) { - /* - * We're out of note headers. - */ - break; - } - - if (offset + nh_descsz >= bufsize) - break; - - if (nh_namesz == 4 && - strcmp(&nbuf[nameoffset], "GNU") == 0 && - nh_type == NT_GNU_VERSION && - nh_descsz == 16) { - uint32_t *desc = - (uint32_t *)&nbuf[offset]; - - printf(", for GNU/"); - switch (getu32(swap, desc[0])) { - case GNU_OS_LINUX: - printf("Linux"); - break; - case GNU_OS_HURD: - printf("Hurd"); - break; - case GNU_OS_SOLARIS: - printf("Solaris"); - break; - default: - printf(""); - } - printf(" %d.%d.%d", - getu32(swap, desc[1]), - getu32(swap, desc[2]), - getu32(swap, desc[3])); - } - - if (nh_namesz == 7 && - strcmp(&nbuf[nameoffset], "NetBSD") == 0 && - nh_type == NT_NETBSD_VERSION && - nh_descsz == 4) { - printf(", for NetBSD"); - /* - * Version number is stuck at 199905, - * and hence is basically content-free. - */ - } - - if (nh_namesz == 8 && - strcmp(&nbuf[nameoffset], "FreeBSD") == 0 && - nh_type == NT_FREEBSD_VERSION && - nh_descsz == 4) { - uint32_t desc = getu32(swap, - *(uint32_t *)&nbuf[offset]); - printf(", for FreeBSD"); - /* - * Contents is __FreeBSD_version, - * whose relation to OS versions is - * defined by a huge table in the - * Porters' Handbook. Happily, the - * first three digits are the version - * number, at least in versions of - * FreeBSD that use this note. - */ - - printf(" %d.%d", desc / 100000, - desc / 10000 % 10); - if (desc / 1000 % 10 > 0) - printf(".%d", - desc / 1000 % 10); - } - - if (nh_namesz == 8 && - strcmp(&nbuf[nameoffset], "OpenBSD") == 0 && - nh_type == NT_OPENBSD_VERSION && - nh_descsz == 4) { - printf(", for OpenBSD"); - /* Content of note is always 0 */ - } - } - if ((lseek(fd, savedoffset + offset, SEEK_SET)) == -1) - error("lseek failed (%s).\n", strerror(errno)); - break; - } - } - printf(", %s linked%s", linking_style, shared_libraries); -} - #ifdef ELFCORE size_t prpsoffsets32[] = { 8, /* FreeBSD */ @@ -364,7 +187,7 @@ dophn_core(int class, int swap, int fd, off_t off, int num, size_t size) Elf32_Nhdr *nh32 = NULL; Elf64_Phdr ph64; Elf64_Nhdr *nh64 = NULL; - size_t offset, nameoffset, noffset, reloffset; + size_t offset, noffset, reloffset; unsigned char c; int i, j; char nbuf[BUFSIZ]; @@ -398,161 +221,339 @@ dophn_core(int class, int swap, int fd, off_t off, int num, size_t size) for (;;) { if (offset >= bufsize) break; - if (class == ELFCLASS32) - nh32 = (Elf32_Nhdr *)&nbuf[offset]; - else - nh64 = (Elf64_Nhdr *)&nbuf[offset]; - offset += nh_size; + offset += donote(nbuf, offset, bufsize, + class, swap, 4); - /* - * Check whether this note has the name "CORE" or - * "FreeBSD", or "NetBSD-CORE". - */ - if (offset + nh_namesz >= bufsize) { - /* - * We're past the end of the buffer. - */ - break; - } + } + } +} +#endif - nameoffset = offset; - offset += nh_namesz; - offset = ((offset + 3)/4)*4; +static size_t +donote(unsigned char *nbuf, size_t offset, size_t size, int class, int swap, + int align) +{ + Elf32_Nhdr *nh32 = NULL; + Elf64_Nhdr *nh64 = NULL; + size_t noff, doff; +#ifdef ELFCORE + int os_style = -1; +#endif - /* - * 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 (os_style == -1) { - if ((nh_namesz == 4 && - strncmp(&nbuf[nameoffset], - "CORE", 4) == 0) || - (nh_namesz == 5 && - strcmp(&nbuf[nameoffset], - "CORE") == 0)) { - os_style = OS_STYLE_SVR4; - } else - if ((nh_namesz == 8 && - strcmp(&nbuf[nameoffset], - "FreeBSD") == 0)) { - os_style = OS_STYLE_FREEBSD; - } else - if ((nh_namesz >= 11 && - strncmp(&nbuf[nameoffset], - "NetBSD-CORE", 11) == 0)) { - os_style = OS_STYLE_NETBSD; - } else - continue; - printf(", %s-style", os_style_names[os_style]); + if (class == ELFCLASS32) + nh32 = (Elf32_Nhdr *)&nbuf[offset]; + else + nh64 = (Elf64_Nhdr *)&nbuf[offset]; + offset += nh_size; + + if ((nh_namesz == 0) && (nh_descsz == 0)) { + /* + * We're out of note headers. + */ + return offset; + } + + noff = offset; + doff = ELF_ALIGN(offset + nh_namesz); + + if (offset + nh_namesz >= size) { + /* + * We're past the end of the buffer. + */ + return doff; + } + + offset = ELF_ALIGN(doff + nh_descsz); + if (offset + nh_descsz >= size) + return offset; + + if (nh_namesz == 4 && strcmp(&nbuf[noff], "GNU") == 0 && + nh_type == NT_GNU_VERSION && nh_descsz == 16) { + uint32_t *desc = (uint32_t *)&nbuf[doff]; + + printf(", for GNU/"); + switch (getu32(swap, desc[0])) { + case GNU_OS_LINUX: + printf("Linux"); + break; + case GNU_OS_HURD: + printf("Hurd"); + break; + case GNU_OS_SOLARIS: + printf("Solaris"); + break; + default: + printf(""); + } + printf(" %d.%d.%d", getu32(swap, desc[1]), + getu32(swap, desc[2]), getu32(swap, desc[3])); + } + + if (nh_namesz == 7 && strcmp(&nbuf[noff], "NetBSD") == 0 && + nh_type == NT_NETBSD_VERSION && nh_descsz == 4) { + uint32_t desc = getu32(swap, *(uint32_t *)&nbuf[doff]); + + printf(", for NetBSD"); + /* + * The version number used to be stuck as 199906, 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; + + printf(" %u.%u", ver_maj, ver_min); + if (ver_rel == 0 && ver_patch != 0) { + printf(".%u", ver_patch); + } else if (ver_rel != 0 && ver_rel <= 26) { + printf("%c", 'A' + ver_rel - 1); + } else if (ver_rel != 0 && ver_rel <= 52) { + printf("Z%c", 'A' + ver_rel - 1); + } else if (ver_rel != 0) { + printf(""); } + } + } - if (os_style == OS_STYLE_NETBSD && - nh_type == NT_NETBSD_CORE_PROCINFO) { - uint32_t signo; + if (nh_namesz == 8 && strcmp(&nbuf[noff], "FreeBSD") == 0 && + nh_type == NT_FREEBSD_VERSION && nh_descsz == 4) { + uint32_t desc = getu32(swap, + *(uint32_t *)&nbuf[doff]); + printf(", for FreeBSD"); + /* + * Contents is __FreeBSD_version, whose relation to OS versions + * is defined by a huge table in the Porters' Handbook. Happily, + * the first three digits are the version number, at least in + * versions of FreeBSD that use this note. + */ + printf(" %d.%d", desc / 100000, desc / 10000 % 10); + if (desc / 1000 % 10 > 0) + printf(".%d", desc / 1000 % 10); + } + if (nh_namesz == 8 && strcmp(&nbuf[noff], "OpenBSD") == 0 && + nh_type == NT_OPENBSD_VERSION && nh_descsz == 4) { + printf(", for OpenBSD"); + /* Content of note is always 0 */ + } + + /* + * 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 ((nh_namesz == 4 && strncmp(&nbuf[noff], "CORE", 4) == 0) || + (nh_namesz == 5 && strcmp(&nbuf[noff], "CORE") == 0)) { + os_style = OS_STYLE_SVR4; + } + + if ((nh_namesz == 8 && strcmp(&nbuf[noff], "FreeBSD") == 0)) { + os_style = OS_STYLE_FREEBSD; + } + + if ((nh_namesz >= 11 && strncmp(&nbuf[noff], "NetBSD-CORE", 11) == 0)) { + os_style = OS_STYLE_NETBSD; + } + +#ifdef ELFCORE + if (os_style != -1) + printf(", %s-style", os_style_names[os_style]); + + if (os_style == OS_STYLE_NETBSD && nh_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. + */ + printf(", from '%.31s'", &nbuf[doff + 0x7c]); + + /* + * Extract the signal number. It is at + * offset 0x08. + */ + memcpy(&signo, &nbuf[doff + 0x08], + sizeof(signo)); + printf(" (signal %u)", getu32(swap, signo)); + return size; + } else if (os_style != OS_STYLE_NETBSD && nh_type == NT_PRPSINFO) { + int 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. + */ + for (i = 0; i < NOFFSETS; i++) { + size_t reloffset = prpsoffsets(i); + size_t noffset = doff + reloffset; + for (j = 0; j < 16; j++, noffset++, reloffset++) { /* - * Extract the program name. It is at - * offset 0x7c, and is up to 32-bytes, - * including the terminating NUL. - */ - printf(", from '%.31s'", &nbuf[offset + 0x7c]); - - /* - * Extract the signal number. It is at - * offset 0x08. + * Make sure we're not past + * the end of the buffer; if + * we are, just give up. */ - memcpy(&signo, &nbuf[offset + 0x08], - sizeof(signo)); - printf(" (signal %u)", getu32(swap, signo)); - } else - if (os_style != OS_STYLE_NETBSD && - nh_type == NT_PRPSINFO) { + if (noffset >= size) + goto tryanother; + /* - * 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. + * Make sure we're not past + * the end of the contents; + * if we are, this obviously + * isn't the right offset. */ - for (i = 0; i < NOFFSETS; i++) { - reloffset = prpsoffsets(i); - noffset = offset + 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 >= bufsize) - 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 >= nh_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. - */ -#define isquote(c) (strchr("'\"`", (c)) != NULL) - if (!isprint(c) || - isquote(c)) - goto tryanother; - } - } + if (reloffset >= nh_descsz) + goto tryanother; + c = nbuf[noffset]; + if (c == '\0') { /* - * Well, that worked. + * A '\0' at the + * beginning is + * obviously wrong. + * Any other '\0' + * means we're done. */ - printf(", from '%.16s'", - &nbuf[offset + prpsoffsets(i)]); - break; - - tryanother: - ; + 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; } - break; } - offset += nh_descsz; - offset = ((offset + 3)/4)*4; + + /* + * Well, that worked. + */ + printf(", from '%.16s'", + &nbuf[doff + prpsoffsets(i)]); + return size; + + tryanother: + ; } + return offset; } -} #endif + return offset; +} + +static void +doshn(int class, int swap, int fd, off_t off, int num, size_t size) +{ + Elf32_Shdr sh32; + Elf64_Shdr sh64; + + if (size != sh_size) + error("corrupted section header size.\n"); + + if (lseek(fd, off, SEEK_SET) == -1) + error("lseek failed (%s).\n", strerror(errno)); + + for ( ; num; num--) { + if (read(fd, sh_addr, sh_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(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 = ""; + char nbuf[BUFSIZ]; + int bufsize; + size_t offset; + off_t savedoffset; + + if (size != ph_size) + error("corrupted program header size.\n"); + if (lseek(fd, off, SEEK_SET) == -1) + error("lseek failed (%s).\n", strerror(errno)); + + for ( ; num; num--) { + if (read(fd, ph_addr, ph_size) == -1) + error("read failed (%s).\n", strerror(errno)); + if ((savedoffset = lseek(fd, 0, SEEK_CUR)) == -1) + error("lseek failed (%s).\n", strerror(errno)); + + switch (ph_type) { + case PT_DYNAMIC: + linking_style = "dynamically"; + break; + case PT_INTERP: + shared_libraries = " (uses shared libs)"; + break; + case PT_NOTE: + /* + * This is a PT_NOTE section; loop through all the notes + * in the section. + */ + if (lseek(fd, (off_t) ph_offset, SEEK_SET) == -1) + error("lseek failed (%s).\n", strerror(errno)); + bufsize = read(fd, nbuf, sizeof(nbuf)); + if (bufsize == -1) + error(": " "read failed (%s).\n", + strerror(errno)); + offset = 0; + for (;;) { + if (offset >= bufsize) + break; + offset += donote(nbuf, offset, bufsize, + class, swap, ph_align); + } + if ((lseek(fd, savedoffset + offset, SEEK_SET)) == -1) + error("lseek failed (%s).\n", strerror(errno)); + break; + } + } + printf(", %s linked%s", linking_style, shared_libraries); +} + void tryelf(int fd, unsigned char *buf, int nbytes) -- 2.50.1