diff options
Diffstat (limited to 'elf/dl-sysdep.c')
| -rw-r--r-- | elf/dl-sysdep.c | 602 |
1 files changed, 0 insertions, 602 deletions
diff --git a/elf/dl-sysdep.c b/elf/dl-sysdep.c deleted file mode 100644 index 68e08f4..0000000 --- a/elf/dl-sysdep.c +++ /dev/null @@ -1,602 +0,0 @@ -/* Operating system support for run-time dynamic linker. Generic Unix version. - Copyright (C) 1995-1998, 2000-2005, 2007 Free Software Foundation, Inc. - This file is part of the GNU C Library. - - The GNU C Library is free software; you can redistribute it and/or - modify it under the terms of the GNU Lesser General Public - License as published by the Free Software Foundation; either - version 2.1 of the License, or (at your option) any later version. - - The GNU C Library is distributed in the hope that it will be useful, - but WITHOUT ANY WARRANTY; without even the implied warranty of - MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU - Lesser General Public License for more details. - - You should have received a copy of the GNU Lesser General Public - License along with the GNU C Library; if not, write to the Free - Software Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA - 02111-1307 USA. */ - -#include <assert.h> -#include <elf.h> -#include <errno.h> -#include <fcntl.h> -#include <libintl.h> -#include <stdlib.h> -#include <string.h> -#include <unistd.h> -#include <sys/types.h> -#include <sys/stat.h> -#include <sys/mman.h> -#include <ldsodefs.h> -#include <stdio-common/_itoa.h> -#include <fpu_control.h> - -#include <entry.h> -#include <dl-machine.h> -#include <dl-procinfo.h> -#include <dl-osinfo.h> -#include <hp-timing.h> -#include <tls.h> - -#ifdef _DL_FIRST_PLATFORM -# define _DL_FIRST_EXTRA (_DL_FIRST_PLATFORM + _DL_PLATFORMS_COUNT) -#else -# define _DL_FIRST_EXTRA _DL_HWCAP_COUNT -#endif - -extern char **_environ attribute_hidden; -extern void _end attribute_hidden; - -/* Protect SUID program against misuse of file descriptors. */ -extern void __libc_check_standard_fds (void); - -#ifdef NEED_DL_BASE_ADDR -ElfW(Addr) _dl_base_addr; -#endif -int __libc_enable_secure attribute_relro = 0; -INTVARDEF(__libc_enable_secure) -int __libc_multiple_libcs = 0; /* Defining this here avoids the inclusion - of init-first. */ -/* This variable contains the lowest stack address ever used. */ -void *__libc_stack_end attribute_relro = NULL; -rtld_hidden_data_def(__libc_stack_end) -static ElfW(auxv_t) *_dl_auxv attribute_relro; - -#ifndef DL_FIND_ARG_COMPONENTS -# define DL_FIND_ARG_COMPONENTS(cookie, argc, argv, envp, auxp) \ - do { \ - void **_tmp; \ - (argc) = *(long int *) cookie; \ - (argv) = (char **) ((long int *) cookie + 1); \ - (envp) = (argv) + (argc) + 1; \ - for (_tmp = (void **) (envp); *_tmp; ++_tmp) \ - continue; \ - (auxp) = (void *) ++_tmp; \ - } while (0) -#endif - -#ifndef DL_STACK_END -# define DL_STACK_END(cookie) ((void *) (cookie)) -#endif - -ElfW(Addr) -_dl_sysdep_start (void **start_argptr, - void (*dl_main) (const ElfW(Phdr) *phdr, ElfW(Word) phnum, - ElfW(Addr) *user_entry)) -{ - const ElfW(Phdr) *phdr = NULL; - ElfW(Word) phnum = 0; - ElfW(Addr) user_entry; - ElfW(auxv_t) *av; -#ifdef HAVE_AUX_SECURE -# define set_seen(tag) (tag) /* Evaluate for the side effects. */ -# define set_seen_secure() ((void) 0) -#else - uid_t uid = 0; - gid_t gid = 0; - unsigned int seen = 0; -# define set_seen_secure() (seen = -1) -# ifdef HAVE_AUX_XID -# define set_seen(tag) (tag) /* Evaluate for the side effects. */ -# else -# define M(type) (1 << (type)) -# define set_seen(tag) seen |= M ((tag)->a_type) -# endif -#endif -#ifdef NEED_DL_SYSINFO - uintptr_t new_sysinfo = 0; -#endif - - __libc_stack_end = DL_STACK_END (start_argptr); - DL_FIND_ARG_COMPONENTS (start_argptr, _dl_argc, INTUSE(_dl_argv), _environ, - _dl_auxv); - - user_entry = (ElfW(Addr)) ENTRY_POINT; - GLRO(dl_platform) = NULL; /* Default to nothing known about the platform. */ - - for (av = _dl_auxv; av->a_type != AT_NULL; set_seen (av++)) - switch (av->a_type) - { - case AT_PHDR: - phdr = (void *) av->a_un.a_val; - break; - case AT_PHNUM: - phnum = av->a_un.a_val; - break; - case AT_PAGESZ: - GLRO(dl_pagesize) = av->a_un.a_val; - break; - case AT_ENTRY: - user_entry = av->a_un.a_val; - break; -#ifdef NEED_DL_BASE_ADDR - case AT_BASE: - _dl_base_addr = av->a_un.a_val; - break; -#endif -#ifndef HAVE_AUX_SECURE - case AT_UID: - case AT_EUID: - uid ^= av->a_un.a_val; - break; - case AT_GID: - case AT_EGID: - gid ^= av->a_un.a_val; - break; -#endif - case AT_SECURE: -#ifndef HAVE_AUX_SECURE - seen = -1; -#endif - INTUSE(__libc_enable_secure) = av->a_un.a_val; - break; - case AT_PLATFORM: - GLRO(dl_platform) = (void *) av->a_un.a_val; - break; - case AT_HWCAP: - GLRO(dl_hwcap) = (unsigned long int) av->a_un.a_val; - break; - case AT_CLKTCK: - GLRO(dl_clktck) = av->a_un.a_val; - break; - case AT_FPUCW: - GLRO(dl_fpu_control) = av->a_un.a_val; - break; -#ifdef NEED_DL_SYSINFO - case AT_SYSINFO: - new_sysinfo = av->a_un.a_val; - break; -#endif -#if defined NEED_DL_SYSINFO || defined NEED_DL_SYSINFO_DSO - case AT_SYSINFO_EHDR: - GLRO(dl_sysinfo_dso) = (void *) av->a_un.a_val; - break; -#endif -#ifdef DL_PLATFORM_AUXV - DL_PLATFORM_AUXV -#endif - } - -#ifndef HAVE_AUX_SECURE - if (seen != -1) - { - /* Fill in the values we have not gotten from the kernel through the - auxiliary vector. */ -# ifndef HAVE_AUX_XID -# define SEE(UID, var, uid) \ - if ((seen & M (AT_##UID)) == 0) var ^= __get##uid () - SEE (UID, uid, uid); - SEE (EUID, uid, euid); - SEE (GID, gid, gid); - SEE (EGID, gid, egid); -# endif - - /* If one of the two pairs of IDs does not match this is a setuid - or setgid run. */ - INTUSE(__libc_enable_secure) = uid | gid; - } -#endif - -#ifndef HAVE_AUX_PAGESIZE - if (GLRO(dl_pagesize) == 0) - GLRO(dl_pagesize) = __getpagesize (); -#endif - -#if defined NEED_DL_SYSINFO - /* Only set the sysinfo value if we also have the vsyscall DSO. */ - if (GLRO(dl_sysinfo_dso) != 0 && new_sysinfo) - GLRO(dl_sysinfo) = new_sysinfo; -#endif - -#ifdef DL_SYSDEP_INIT - DL_SYSDEP_INIT; -#endif - -#ifdef DL_PLATFORM_INIT - DL_PLATFORM_INIT; -#endif - - /* Determine the length of the platform name. */ - if (GLRO(dl_platform) != NULL) - GLRO(dl_platformlen) = strlen (GLRO(dl_platform)); - - if (__sbrk (0) == &_end) - /* The dynamic linker was run as a program, and so the initial break - starts just after our bss, at &_end. The malloc in dl-minimal.c - will consume the rest of this page, so tell the kernel to move the - break up that far. When the user program examines its break, it - will see this new value and not clobber our data. */ - __sbrk (GLRO(dl_pagesize) - - ((&_end - (void *) 0) & (GLRO(dl_pagesize) - 1))); - - /* If this is a SUID program we make sure that FDs 0, 1, and 2 are - allocated. If necessary we are doing it ourself. If it is not - possible we stop the program. */ - if (__builtin_expect (INTUSE(__libc_enable_secure), 0)) - __libc_check_standard_fds (); - - (*dl_main) (phdr, phnum, &user_entry); - return user_entry; -} - -void -internal_function -_dl_sysdep_start_cleanup (void) -{ -} - -void -internal_function -_dl_show_auxv (void) -{ - char buf[64]; - ElfW(auxv_t) *av; - - /* Terminate string. */ - buf[63] = '\0'; - - /* The following code assumes that the AT_* values are encoded - starting from 0 with AT_NULL, 1 for AT_IGNORE, and all other values - close by (otherwise the array will be too large). In case we have - to support a platform where these requirements are not fulfilled - some alternative implementation has to be used. */ - for (av = _dl_auxv; av->a_type != AT_NULL; ++av) - { - static const struct - { - const char label[20]; - enum { unknown = 0, dec, hex, str, ignore } form; - } auxvars[] = - { - [AT_EXECFD - 2] = { "AT_EXECFD: ", dec }, - [AT_PHDR - 2] = { "AT_PHDR: 0x", hex }, - [AT_PHENT - 2] = { "AT_PHENT: ", dec }, - [AT_PHNUM - 2] = { "AT_PHNUM: ", dec }, - [AT_PAGESZ - 2] = { "AT_PAGESZ: ", dec }, - [AT_BASE - 2] = { "AT_BASE: 0x", hex }, - [AT_FLAGS - 2] = { "AT_FLAGS: 0x", hex }, - [AT_ENTRY - 2] = { "AT_ENTRY: 0x", hex }, - [AT_NOTELF - 2] = { "AT_NOTELF: ", hex }, - [AT_UID - 2] = { "AT_UID: ", dec }, - [AT_EUID - 2] = { "AT_EUID: ", dec }, - [AT_GID - 2] = { "AT_GID: ", dec }, - [AT_EGID - 2] = { "AT_EGID: ", dec }, - [AT_PLATFORM - 2] = { "AT_PLATFORM: ", str }, - [AT_HWCAP - 2] = { "AT_HWCAP: ", hex }, - [AT_CLKTCK - 2] = { "AT_CLKTCK: ", dec }, - [AT_FPUCW - 2] = { "AT_FPUCW: ", hex }, - [AT_DCACHEBSIZE - 2] = { "AT_DCACHEBSIZE: 0x", hex }, - [AT_ICACHEBSIZE - 2] = { "AT_ICACHEBSIZE: 0x", hex }, - [AT_UCACHEBSIZE - 2] = { "AT_UCACHEBSIZE: 0x", hex }, - [AT_IGNOREPPC - 2] = { "AT_IGNOREPPC", ignore }, - [AT_SECURE - 2] = { "AT_SECURE: ", dec }, - [AT_SYSINFO - 2] = { "AT_SYSINFO: 0x", hex }, - [AT_SYSINFO_EHDR - 2] = { "AT_SYSINFO_EHDR: 0x", hex }, - }; - unsigned int idx = (unsigned int) (av->a_type - 2); - - if ((unsigned int) av->a_type < 2u || auxvars[idx].form == ignore) - continue; - - assert (AT_NULL == 0); - assert (AT_IGNORE == 1); - - if (av->a_type == AT_HWCAP) - { - /* This is handled special. */ - if (_dl_procinfo (av->a_un.a_val) == 0) - continue; - } - - if (idx < sizeof (auxvars) / sizeof (auxvars[0]) - && auxvars[idx].form != unknown) - { - const char *val = (char *) av->a_un.a_val; - - if (__builtin_expect (auxvars[idx].form, dec) == dec) - val = _itoa ((unsigned long int) av->a_un.a_val, - buf + sizeof buf - 1, 10, 0); - else if (__builtin_expect (auxvars[idx].form, hex) == hex) - val = _itoa ((unsigned long int) av->a_un.a_val, - buf + sizeof buf - 1, 16, 0); - - _dl_printf ("%s%s\n", auxvars[idx].label, val); - - continue; - } - - /* Unknown value: print a generic line. */ - char buf2[17]; - buf[sizeof (buf2) - 1] = '\0'; - const char *val2 = _itoa ((unsigned long int) av->a_un.a_val, - buf2 + sizeof buf2 - 1, 16, 0); - const char *val = _itoa ((unsigned long int) av->a_type, - buf + sizeof buf - 1, 16, 0); - _dl_printf ("AT_??? (0x%s): 0x%s\n", val, val2); - } -} - - -/* Return an array of useful/necessary hardware capability names. */ -const struct r_strlenpair * -internal_function -_dl_important_hwcaps (const char *platform, size_t platform_len, size_t *sz, - size_t *max_capstrlen) -{ - /* Determine how many important bits are set. */ - uint64_t masked = GLRO(dl_hwcap) & GLRO(dl_hwcap_mask); - size_t cnt = platform != NULL; - size_t n, m; - size_t total; - struct r_strlenpair *temp; - struct r_strlenpair *result; - struct r_strlenpair *rp; - char *cp; - - /* Count the number of bits set in the masked value. */ - for (n = 0; (~((1ULL << n) - 1) & masked) != 0; ++n) - if ((masked & (1ULL << n)) != 0) - ++cnt; - -#if (defined NEED_DL_SYSINFO || defined NEED_DL_SYSINFO_DSO) && defined SHARED - /* The system-supplied DSO can contain a note of type 2, vendor "GNU". - This gives us a list of names to treat as fake hwcap bits. */ - - const char *dsocaps = NULL; - size_t dsocapslen = 0; - if (GLRO(dl_sysinfo_map) != NULL) - { - const ElfW(Phdr) *const phdr = GLRO(dl_sysinfo_map)->l_phdr; - const ElfW(Word) phnum = GLRO(dl_sysinfo_map)->l_phnum; - for (uint_fast16_t i = 0; i < phnum; ++i) - if (phdr[i].p_type == PT_NOTE) - { - const ElfW(Addr) start = (phdr[i].p_vaddr - + GLRO(dl_sysinfo_map)->l_addr); - const struct - { - ElfW(Word) vendorlen; - ElfW(Word) datalen; - ElfW(Word) type; - } *note = (const void *) start; - while ((ElfW(Addr)) (note + 1) - start < phdr[i].p_memsz) - { -#define ROUND(len) (((len) + sizeof (ElfW(Word)) - 1) & -sizeof (ElfW(Word))) - if (note->type == 2 - && note->vendorlen == sizeof "GNU" - && !memcmp ((note + 1), "GNU", sizeof "GNU") - && note->datalen > 2 * sizeof (ElfW(Word)) + 2) - { - const ElfW(Word) *p = ((const void *) (note + 1) - + ROUND (sizeof "GNU")); - cnt += *p++; - ++p; /* Skip mask word. */ - dsocaps = (const char *) p; - dsocapslen = note->datalen - sizeof *p * 2; - break; - } - note = ((const void *) (note + 1) - + ROUND (note->vendorlen) + ROUND (note->datalen)); - } - if (dsocaps != NULL) - break; - } - } -#endif - -#ifdef USE_TLS - /* For TLS enabled builds always add 'tls'. */ - ++cnt; -#else - if (cnt == 0) - { - /* If we no have platform name and no important capability we only - have the base directory to search. */ - result = (struct r_strlenpair *) malloc (sizeof (*result)); - if (result == NULL) - goto no_memory; - - result[0].str = (char *) result; /* Does not really matter. */ - result[0].len = 0; - - *sz = 1; - return result; - } -#endif - - /* Create temporary data structure to generate result table. */ - temp = (struct r_strlenpair *) alloca (cnt * sizeof (*temp)); - m = 0; -#if defined NEED_DL_SYSINFO || defined NEED_DL_SYSINFO_DSO - if (dsocaps != NULL) - { - const ElfW(Word) mask = ((const ElfW(Word) *) dsocaps)[-1]; - GLRO(dl_hwcap) |= (uint64_t) mask << _DL_FIRST_EXTRA; - size_t len; - for (const char *p = dsocaps; p < dsocaps + dsocapslen; p += len + 1) - { - uint_fast8_t bit = *p++; - len = strlen (p); - - /* Skip entries that are not enabled in the mask word. */ - if (__builtin_expect (mask & ((ElfW(Word)) 1 << bit), 1)) - { - temp[m].str = p; - temp[m].len = len; - ++m; - } - else - --cnt; - } - } -#endif - for (n = 0; masked != 0; ++n) - if ((masked & (1ULL << n)) != 0) - { - temp[m].str = _dl_hwcap_string (n); - temp[m].len = strlen (temp[m].str); - masked ^= 1ULL << n; - ++m; - } - if (platform != NULL) - { - temp[m].str = platform; - temp[m].len = platform_len; - ++m; - } -#ifdef USE_TLS - temp[m].str = "tls"; - temp[m].len = 3; - ++m; -#endif - assert (m == cnt); - - /* Determine the total size of all strings together. */ - if (cnt == 1) - total = temp[0].len + 1; - else - { - total = temp[0].len + temp[cnt - 1].len + 2; - if (cnt > 2) - { - total <<= 1; - for (n = 1; n + 1 < cnt; ++n) - total += temp[n].len + 1; - if (cnt > 3 - && (cnt >= sizeof (size_t) * 8 - || total + (sizeof (*result) << 3) - >= (1UL << (sizeof (size_t) * 8 - cnt + 3)))) - _dl_signal_error (ENOMEM, NULL, NULL, - N_("cannot create capability list")); - - total <<= cnt - 3; - } - } - - /* The result structure: we use a very compressed way to store the - various combinations of capability names. */ - *sz = 1 << cnt; - result = (struct r_strlenpair *) malloc (*sz * sizeof (*result) + total); - if (result == NULL) - { -#ifndef USE_TLS - no_memory: -#endif - _dl_signal_error (ENOMEM, NULL, NULL, - N_("cannot create capability list")); - } - - if (cnt == 1) - { - result[0].str = (char *) (result + *sz); - result[0].len = temp[0].len + 1; - result[1].str = (char *) (result + *sz); - result[1].len = 0; - cp = __mempcpy ((char *) (result + *sz), temp[0].str, temp[0].len); - *cp = '/'; - *sz = 2; - *max_capstrlen = result[0].len; - - return result; - } - - /* Fill in the information. This follows the following scheme - (indeces from TEMP for four strings): - entry #0: 0, 1, 2, 3 binary: 1111 - #1: 0, 1, 3 1101 - #2: 0, 2, 3 1011 - #3: 0, 3 1001 - This allows the representation of all possible combinations of - capability names in the string. First generate the strings. */ - result[1].str = result[0].str = cp = (char *) (result + *sz); -#define add(idx) \ - cp = __mempcpy (__mempcpy (cp, temp[idx].str, temp[idx].len), "/", 1); - if (cnt == 2) - { - add (1); - add (0); - } - else - { - n = 1 << (cnt - 1); - do - { - n -= 2; - - /* We always add the last string. */ - add (cnt - 1); - - /* Add the strings which have the bit set in N. */ - for (m = cnt - 2; m > 0; --m) - if ((n & (1 << m)) != 0) - add (m); - - /* Always add the first string. */ - add (0); - } - while (n != 0); - } -#undef add - - /* Now we are ready to install the string pointers and length. */ - for (n = 0; n < (1UL << cnt); ++n) - result[n].len = 0; - n = cnt; - do - { - size_t mask = 1 << --n; - - rp = result; - for (m = 1 << cnt; m > 0; ++rp) - if ((--m & mask) != 0) - rp->len += temp[n].len + 1; - } - while (n != 0); - - /* The first half of the strings all include the first string. */ - n = (1 << cnt) - 2; - rp = &result[2]; - while (n != (1UL << (cnt - 1))) - { - if ((--n & 1) != 0) - rp[0].str = rp[-2].str + rp[-2].len; - else - rp[0].str = rp[-1].str; - ++rp; - } - - /* The second half starts right after the first part of the string of - the corresponding entry in the first half. */ - do - { - rp[0].str = rp[-(1 << (cnt - 1))].str + temp[cnt - 1].len + 1; - ++rp; - } - while (--n != 0); - - /* The maximum string length. */ - *max_capstrlen = result[0].len; - - return result; -} |