diff options
| -rw-r--r-- | elf/dl-support.c | 80 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/alpha/dl-auxv.h | 18 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/dl-parse_auxv.h | 61 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/dl-sysdep.c | 109 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/powerpc/dl-auxv.h | 14 | ||||
| -rw-r--r-- | sysdeps/unix/sysv/linux/powerpc/dl-support.c | 4 |
6 files changed, 180 insertions, 106 deletions
diff --git a/elf/dl-support.c b/elf/dl-support.c index 1977a2b..6d2c4ba 100644 --- a/elf/dl-support.c +++ b/elf/dl-support.c @@ -240,21 +240,93 @@ __rtld_lock_define_initialized_recursive (, _dl_load_tls_lock) #ifdef HAVE_AUX_VECTOR -#include <dl-parse_auxv.h> - int _dl_clktck; void _dl_aux_init (ElfW(auxv_t) *av) { + int seen = 0; + uid_t uid = 0; + gid_t gid = 0; + #ifdef NEED_DL_SYSINFO /* NB: Avoid RELATIVE relocation in static PIE. */ GL(dl_sysinfo) = DL_SYSINFO_DEFAULT; #endif _dl_auxv = av; - dl_parse_auxv_t auxv_values = { 0, }; - _dl_parse_auxv (av, auxv_values); + for (; av->a_type != AT_NULL; ++av) + switch (av->a_type) + { + case AT_PAGESZ: + if (av->a_un.a_val != 0) + GLRO(dl_pagesize) = av->a_un.a_val; + break; + case AT_CLKTCK: + GLRO(dl_clktck) = av->a_un.a_val; + break; + case AT_PHDR: + GL(dl_phdr) = (const void *) av->a_un.a_val; + break; + case AT_PHNUM: + GL(dl_phnum) = 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_HWCAP2: + GLRO(dl_hwcap2) = (unsigned long int) 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: + GL(dl_sysinfo) = av->a_un.a_val; + break; +#endif +#ifdef NEED_DL_SYSINFO_DSO + case AT_SYSINFO_EHDR: + GL(dl_sysinfo_dso) = (void *) av->a_un.a_val; + break; +#endif + case AT_UID: + uid ^= av->a_un.a_val; + seen |= 1; + break; + case AT_EUID: + uid ^= av->a_un.a_val; + seen |= 2; + break; + case AT_GID: + gid ^= av->a_un.a_val; + seen |= 4; + break; + case AT_EGID: + gid ^= av->a_un.a_val; + seen |= 8; + break; + case AT_SECURE: + seen = -1; + __libc_enable_secure = av->a_un.a_val; + __libc_enable_secure_decided = 1; + break; + case AT_RANDOM: + _dl_random = (void *) av->a_un.a_val; + break; + case AT_MINSIGSTKSZ: + _dl_minsigstacksize = av->a_un.a_val; + break; + DL_PLATFORM_AUXV + } + if (seen == 0xf) + { + __libc_enable_secure = uid != 0 || gid != 0; + __libc_enable_secure_decided = 1; + } } #endif diff --git a/sysdeps/unix/sysv/linux/alpha/dl-auxv.h b/sysdeps/unix/sysv/linux/alpha/dl-auxv.h index fcec743..81d90da 100644 --- a/sysdeps/unix/sysv/linux/alpha/dl-auxv.h +++ b/sysdeps/unix/sysv/linux/alpha/dl-auxv.h @@ -20,8 +20,16 @@ extern long __libc_alpha_cache_shape[4]; -#define DL_PLATFORM_AUXV \ - __libc_alpha_cache_shape[0] = auxv_values[AT_L1I_CACHESHAPE]; \ - __libc_alpha_cache_shape[1] = auxv_values[AT_L1D_CACHESHAPE]; \ - __libc_alpha_cache_shape[2] = auxv_values[AT_L2_CACHESHAPE]; \ - __libc_alpha_cache_shape[3] = auxv_values[AT_L3_CACHESHAPE]; +#define DL_PLATFORM_AUXV \ + case AT_L1I_CACHESHAPE: \ + __libc_alpha_cache_shape[0] = av->a_un.a_val; \ + break; \ + case AT_L1D_CACHESHAPE: \ + __libc_alpha_cache_shape[1] = av->a_un.a_val; \ + break; \ + case AT_L2_CACHESHAPE: \ + __libc_alpha_cache_shape[2] = av->a_un.a_val; \ + break; \ + case AT_L3_CACHESHAPE: \ + __libc_alpha_cache_shape[3] = av->a_un.a_val; \ + break; diff --git a/sysdeps/unix/sysv/linux/dl-parse_auxv.h b/sysdeps/unix/sysv/linux/dl-parse_auxv.h deleted file mode 100644 index b3d82f6..0000000 --- a/sysdeps/unix/sysv/linux/dl-parse_auxv.h +++ /dev/null @@ -1,61 +0,0 @@ -/* Parse the Linux auxiliary vector. - Copyright (C) 1995-2022 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, see - <https://www.gnu.org/licenses/>. */ - -#include <elf.h> -#include <entry.h> -#include <fpu_control.h> -#include <ldsodefs.h> -#include <link.h> - -typedef ElfW(Addr) dl_parse_auxv_t[AT_MINSIGSTKSZ + 1]; - -/* Copy the auxiliary vector into AUX_VALUES and set up GLRO - variables. */ -static inline -void _dl_parse_auxv (ElfW(auxv_t) *av, dl_parse_auxv_t auxv_values) -{ - auxv_values[AT_ENTRY] = (ElfW(Addr)) ENTRY_POINT; - auxv_values[AT_PAGESZ] = EXEC_PAGESIZE; - auxv_values[AT_FPUCW] = _FPU_DEFAULT; - - /* NB: Default to a constant CONSTANT_MINSIGSTKSZ. */ - _Static_assert (__builtin_constant_p (CONSTANT_MINSIGSTKSZ), - "CONSTANT_MINSIGSTKSZ is constant"); - auxv_values[AT_MINSIGSTKSZ] = CONSTANT_MINSIGSTKSZ; - - for (; av->a_type != AT_NULL; av++) - if (av->a_type <= AT_MINSIGSTKSZ) - auxv_values[av->a_type] = av->a_un.a_val; - - GLRO(dl_pagesize) = auxv_values[AT_PAGESZ]; - __libc_enable_secure = auxv_values[AT_SECURE]; - GLRO(dl_platform) = (void *) auxv_values[AT_PLATFORM]; - GLRO(dl_hwcap) = auxv_values[AT_HWCAP]; - GLRO(dl_hwcap2) = auxv_values[AT_HWCAP2]; - GLRO(dl_clktck) = auxv_values[AT_CLKTCK]; - GLRO(dl_fpu_control) = auxv_values[AT_FPUCW]; - _dl_random = (void *) auxv_values[AT_RANDOM]; - GLRO(dl_minsigstacksize) = auxv_values[AT_MINSIGSTKSZ]; - GLRO(dl_sysinfo_dso) = (void *) auxv_values[AT_SYSINFO_EHDR]; -#ifdef NEED_DL_SYSINFO - if (GLRO(dl_sysinfo_dso) != NULL) - GLRO(dl_sysinfo) = auxv_values[AT_SYSINFO]; -#endif - - DL_PLATFORM_AUXV -} diff --git a/sysdeps/unix/sysv/linux/dl-sysdep.c b/sysdeps/unix/sysv/linux/dl-sysdep.c index 71cf196..5e71704 100644 --- a/sysdeps/unix/sysv/linux/dl-sysdep.c +++ b/sysdeps/unix/sysv/linux/dl-sysdep.c @@ -21,12 +21,13 @@ #include <dl-auxv.h> #include <dl-hwcap-check.h> #include <dl-osinfo.h> -#include <dl-parse_auxv.h> #include <dl-procinfo.h> #include <dl-tunables.h> #include <elf.h> +#include <entry.h> #include <errno.h> #include <fcntl.h> +#include <fpu_control.h> #include <ldsodefs.h> #include <libc-internal.h> #include <libintl.h> @@ -62,20 +63,20 @@ void *_dl_random attribute_relro = NULL; # define DL_STACK_END(cookie) ((void *) (cookie)) #endif -/* Arguments passed to dl_main. */ -struct dl_main_arguments +ElfW(Addr) +_dl_sysdep_start (void **start_argptr, + void (*dl_main) (const ElfW(Phdr) *phdr, ElfW(Word) phnum, + ElfW(Addr) *user_entry, ElfW(auxv_t) *auxv)) { - const ElfW(Phdr) *phdr; - ElfW(Word) phnum; + const ElfW(Phdr) *phdr = NULL; + ElfW(Word) phnum = 0; ElfW(Addr) user_entry; -}; + ElfW(auxv_t) *av; +#ifdef NEED_DL_SYSINFO + uintptr_t new_sysinfo = 0; +#endif -/* Separate function, so that dl_main can be called without the large - array on the stack. */ -static void -_dl_sysdep_parse_arguments (void **start_argptr, - struct dl_main_arguments *args) -{ + __libc_stack_end = DL_STACK_END (start_argptr); _dl_argc = (intptr_t) *start_argptr; _dl_argv = (char **) (start_argptr + 1); /* Necessary aliasing violation. */ _environ = _dl_argv + _dl_argc + 1; @@ -87,26 +88,75 @@ _dl_sysdep_parse_arguments (void **start_argptr, break; } - dl_parse_auxv_t auxv_values = { 0, }; - _dl_parse_auxv (GLRO(dl_auxv), auxv_values); + user_entry = (ElfW(Addr)) ENTRY_POINT; + GLRO(dl_platform) = NULL; /* Default to nothing known about the platform. */ - args->phdr = (const ElfW(Phdr) *) auxv_values[AT_PHDR]; - args->phnum = auxv_values[AT_PHNUM]; - args->user_entry = auxv_values[AT_ENTRY]; -} + /* NB: Default to a constant CONSTANT_MINSIGSTKSZ. */ + _Static_assert (__builtin_constant_p (CONSTANT_MINSIGSTKSZ), + "CONSTANT_MINSIGSTKSZ is constant"); + GLRO(dl_minsigstacksize) = CONSTANT_MINSIGSTKSZ; -ElfW(Addr) -_dl_sysdep_start (void **start_argptr, - void (*dl_main) (const ElfW(Phdr) *phdr, ElfW(Word) phnum, - ElfW(Addr) *user_entry, ElfW(auxv_t) *auxv)) -{ - __libc_stack_end = DL_STACK_END (start_argptr); - - struct dl_main_arguments dl_main_args; - _dl_sysdep_parse_arguments (start_argptr, &dl_main_args); + for (av = GLRO(dl_auxv); av->a_type != AT_NULL; 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; + case AT_SECURE: + __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_HWCAP2: + GLRO(dl_hwcap2) = (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 + case AT_SYSINFO_EHDR: + GLRO(dl_sysinfo_dso) = (void *) av->a_un.a_val; + break; + case AT_RANDOM: + _dl_random = (void *) av->a_un.a_val; + break; + case AT_MINSIGSTKSZ: + GLRO(dl_minsigstacksize) = av->a_un.a_val; + break; + DL_PLATFORM_AUXV + } dl_hwcap_check (); +#ifdef NEED_DL_SYSINFO + if (new_sysinfo != 0) + { + /* Only set the sysinfo value if we also have the vsyscall DSO. */ + if (GLRO(dl_sysinfo_dso) != 0) + GLRO(dl_sysinfo) = new_sysinfo; + } +#endif + __tunables_init (_environ); /* Initialize DSO sorting algorithm after tunables. */ @@ -137,9 +187,8 @@ _dl_sysdep_start (void **start_argptr, if (__builtin_expect (__libc_enable_secure, 0)) __libc_check_standard_fds (); - (*dl_main) (dl_main_args.phdr, dl_main_args.phnum, - &dl_main_args.user_entry, GLRO(dl_auxv)); - return dl_main_args.user_entry; + (*dl_main) (phdr, phnum, &user_entry, GLRO(dl_auxv)); + return user_entry; } void diff --git a/sysdeps/unix/sysv/linux/powerpc/dl-auxv.h b/sysdeps/unix/sysv/linux/powerpc/dl-auxv.h index ce2281c..5943719 100644 --- a/sysdeps/unix/sysv/linux/powerpc/dl-auxv.h +++ b/sysdeps/unix/sysv/linux/powerpc/dl-auxv.h @@ -16,5 +16,15 @@ License along with the GNU C Library; if not, see <https://www.gnu.org/licenses/>. */ -#define DL_PLATFORM_AUXV \ - GLRO(dl_cache_line_size) = auxv_values[AT_DCACHEBSIZE]; +#include <ldsodefs.h> + +#if IS_IN (libc) && !defined SHARED +int GLRO(dl_cache_line_size); +#endif + +/* Scan the Aux Vector for the "Data Cache Block Size" entry and assign it + to dl_cache_line_size. */ +#define DL_PLATFORM_AUXV \ + case AT_DCACHEBSIZE: \ + GLRO(dl_cache_line_size) = av->a_un.a_val; \ + break; diff --git a/sysdeps/unix/sysv/linux/powerpc/dl-support.c b/sysdeps/unix/sysv/linux/powerpc/dl-support.c deleted file mode 100644 index abe68a7..0000000 --- a/sysdeps/unix/sysv/linux/powerpc/dl-support.c +++ /dev/null @@ -1,4 +0,0 @@ -#include <elf/dl-support.c> - -/* Populated from the auxiliary vector. */ -int _dl_cache_line_size; |