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* sysdeps/generic/dl-osinfo.h (_dl_setup_stack_chk_guard): Take
one parameter. If non-NULL use it to initialize return value. (_dl_setup_pointer_guard): New function. * sysdeps/unix/sysv/linux/dl-osinfo.h: Likewise. * sysdeps/generic/ldsodefs.h: Declare _dl_random. * elf/rtld.c (security_init): Pass _dl_random to _dl_setup_stack_chk_guard. Call _dl_setup_pointer_guard to initialize pointer_chk_guard. * elf/dl-sysdep.c (_dl_random): New variable. (_dl_sysdep_start): Handle AT_RANDOM. (_dl_show_auxv): Likewise. * elf/dl-support.c (_dl_random): New variable. (_dl_aux_init): Handle AT_RANDOM. * csu/libc-start.c [!SHARED] (libc_start_main): Pass _dl_random to _dl_setup_stack_chk_guard. * elf/elf.h (AT_RANDOM): Define AT_BASE_PLATFORM and AT_RANDOM.
This commit is contained in:
Ulrich Drepper
parent
5b656a0d30
commit
965cb60a21
20
ChangeLog
20
ChangeLog
@ -1,3 +1,23 @@
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2009-01-10 Ulrich Drepper <drepper@redhat.com>
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* sysdeps/generic/dl-osinfo.h (_dl_setup_stack_chk_guard): Take
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one parameter. If non-NULL use it to initialize return value.
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(_dl_setup_pointer_guard): New function.
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* sysdeps/unix/sysv/linux/dl-osinfo.h: Likewise.
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* sysdeps/generic/ldsodefs.h: Declare _dl_random.
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* elf/rtld.c (security_init): Pass _dl_random to
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_dl_setup_stack_chk_guard. Call _dl_setup_pointer_guard to initialize
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pointer_chk_guard.
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* elf/dl-sysdep.c (_dl_random): New variable.
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(_dl_sysdep_start): Handle AT_RANDOM.
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(_dl_show_auxv): Likewise.
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* elf/dl-support.c (_dl_random): New variable.
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(_dl_aux_init): Handle AT_RANDOM.
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* csu/libc-start.c [!SHARED] (libc_start_main): Pass _dl_random
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to _dl_setup_stack_chk_guard.
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* elf/elf.h (AT_RANDOM): Define AT_BASE_PLATFORM and AT_RANDOM.
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2009-01-10 Roland McGrath <roland@redhat.com>
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* nscd/nscd.c (parse_opt): Use argp_error for bad -i argument.
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@ -1,5 +1,5 @@
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/* Support for dynamic linking code in static libc.
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Copyright (C) 1996-2005, 2006, 2007, 2008 Free Software Foundation, Inc.
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Copyright (C) 1996-2008, 2009 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -84,6 +84,9 @@ struct r_scope_elem _dl_initial_searchlist;
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int _dl_starting_up = 1;
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#endif
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/* Random data provided by the kernel. */
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void *_dl_random;
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/* Get architecture specific initializer. */
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#include <dl-procinfo.c>
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@ -216,6 +219,9 @@ _dl_aux_init (ElfW(auxv_t) *av)
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__libc_enable_secure = av->a_un.a_val;
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__libc_enable_secure_decided = 1;
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break;
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case AT_RANDOM:
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_dl_random = (void *) av->a_un.a_val;
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break;
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# ifdef DL_PLATFORM_AUXV
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DL_PLATFORM_AUXV
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# endif
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@ -1,5 +1,5 @@
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/* Operating system support for run-time dynamic linker. Generic Unix version.
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Copyright (C) 1995-1998, 2000-2007, 2008 Free Software Foundation, Inc.
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Copyright (C) 1995-1998, 2000-2008, 2009 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -62,6 +62,7 @@ int __libc_multiple_libcs = 0; /* Defining this here avoids the inclusion
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void *__libc_stack_end attribute_relro = NULL;
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rtld_hidden_data_def(__libc_stack_end)
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static ElfW(auxv_t) *_dl_auxv attribute_relro;
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void *_dl_random attribute_relro = NULL;
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#ifndef DL_FIND_ARG_COMPONENTS
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# define DL_FIND_ARG_COMPONENTS(cookie, argc, argv, envp, auxp) \
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@ -173,6 +174,9 @@ _dl_sysdep_start (void **start_argptr,
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GLRO(dl_sysinfo_dso) = (void *) av->a_un.a_val;
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break;
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#endif
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case AT_RANDOM:
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_dl_random = (void *) av->a_un.a_val;
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break;
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#ifdef DL_PLATFORM_AUXV
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DL_PLATFORM_AUXV
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#endif
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@ -294,6 +298,7 @@ _dl_show_auxv (void)
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[AT_SECURE - 2] = { "AT_SECURE: ", dec },
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[AT_SYSINFO - 2] = { "AT_SYSINFO: 0x", hex },
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[AT_SYSINFO_EHDR - 2] = { "AT_SYSINFO_EHDR: 0x", hex },
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[AT_RANDOM - 2] = { "AT_RANDOM: 0x", hex },
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};
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unsigned int idx = (unsigned int) (av->a_type - 2);
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18
elf/rtld.c
18
elf/rtld.c
@ -1,5 +1,5 @@
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/* Run time dynamic linker.
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Copyright (C) 1995-2006, 2007, 2008 Free Software Foundation, Inc.
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Copyright (C) 1995-2006, 2007, 2008, 2009 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -841,7 +841,7 @@ static void
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security_init (void)
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{
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/* Set up the stack checker's canary. */
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uintptr_t stack_chk_guard = _dl_setup_stack_chk_guard ();
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uintptr_t stack_chk_guard = _dl_setup_stack_chk_guard (_dl_random);
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#ifdef THREAD_SET_STACK_GUARD
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THREAD_SET_STACK_GUARD (stack_chk_guard);
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#else
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@ -851,18 +851,18 @@ security_init (void)
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/* Set up the pointer guard as well, if necessary. */
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if (GLRO(dl_pointer_guard))
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{
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// XXX If it is cheap, we should use a separate value.
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uintptr_t pointer_chk_guard = stack_chk_guard;
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#ifndef HP_TIMING_NONAVAIL
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hp_timing_t now;
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HP_TIMING_NOW (now);
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pointer_chk_guard ^= now;
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#endif
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uintptr_t pointer_chk_guard = _dl_setup_pointer_guard (_dl_random,
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stack_chk_guard);
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#ifdef THREAD_SET_POINTER_GUARD
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THREAD_SET_POINTER_GUARD (pointer_chk_guard);
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#endif
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__pointer_chk_guard_local = pointer_chk_guard;
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}
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/* We do not need the _dl_random value anymore. The less
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information we leave behind, the better, so clear the
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variable. */
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_dl_random = NULL;
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}
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@ -1,12 +1,29 @@
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#include <stdint.h>
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static inline uintptr_t __attribute__ ((always_inline))
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_dl_setup_stack_chk_guard (void)
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_dl_setup_stack_chk_guard (void *dl_random)
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{
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uintptr_t ret = 0;
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unsigned char *p = (unsigned char *) &ret;
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p[sizeof (ret) - 1] = 255;
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p[sizeof (ret) - 2] = '\n';
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p[0] = 0;
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uintptr_t ret;
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if (dl_random == NULL)
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{
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ret = 0;
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unsigned char *p = (unsigned char *) &ret;
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p[sizeof (ret) - 1] = 255;
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p[sizeof (ret) - 2] = '\n';
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p[0] = 0;
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}
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else
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memcmp (&ret, dl_random, sizeof (ret));
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return ret;
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}
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static inline uintptr_t __attribute__ ((always_inline))
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_dl_setup_pointer_guard (void *dl_random, uintptr_t stack_chk_guard)
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{
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uintptr_t ret;
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if (dl_random == NULL)
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ret = stack_chk_guard;
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else
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memcmp (&ret, (char *) dl_random + sizeof (ret), sizeof (ret));
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return ret;
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}
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@ -1,5 +1,5 @@
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/* Run-time dynamic linker data structures for loaded ELF shared objects.
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Copyright (C) 1995-2006, 2007, 2008 Free Software Foundation, Inc.
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Copyright (C) 1995-2006, 2007, 2008, 2009 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -731,6 +731,9 @@ weak_extern (_dl_starting_up)
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extern int _dl_starting_up_internal attribute_hidden;
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#endif
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/* Random data provided by the kernel. */
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extern void *_dl_random attribute_hidden;
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/* OS-dependent function to open the zero-fill device. */
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extern int _dl_sysdep_open_zero_fill (void); /* dl-sysdep.c */
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@ -1,5 +1,5 @@
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/* Operating system specific code for generic dynamic loader functions. Linux.
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Copyright (C) 2000-2002,2004-2007,2008 Free Software Foundation, Inc.
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Copyright (C) 2000-2002,2004-2008, 2009 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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@ -60,22 +60,52 @@ dl_fatal (const char *str)
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} while (0)
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static inline uintptr_t __attribute__ ((always_inline))
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_dl_setup_stack_chk_guard (void)
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_dl_setup_stack_chk_guard (void *dl_random)
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{
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uintptr_t ret;
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#ifdef ENABLE_STACKGUARD_RANDOMIZE
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int fd = __open ("/dev/urandom", O_RDONLY);
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if (fd >= 0)
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#ifndef __ASSUME_AT_RANDOM
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if (__builtin_expect (dl_random == NULL, 0))
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{
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ssize_t reslen = __read (fd, &ret, sizeof (ret));
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__close (fd);
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if (reslen == (ssize_t) sizeof (ret))
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return ret;
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# ifdef ENABLE_STACKGUARD_RANDOMIZE
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int fd = __open ("/dev/urandom", O_RDONLY);
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if (fd >= 0)
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{
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ssize_t reslen = __read (fd, &ret, sizeof (ret));
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__close (fd);
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if (reslen == (ssize_t) sizeof (ret))
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return ret;
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}
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# endif
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ret = 0;
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unsigned char *p = (unsigned char *) &ret;
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p[sizeof (ret) - 1] = 255;
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p[sizeof (ret) - 2] = '\n';
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}
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else
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#endif
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ret = 0;
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unsigned char *p = (unsigned char *) &ret;
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p[sizeof (ret) - 1] = 255;
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p[sizeof (ret) - 2] = '\n';
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/* We need in the moment only 8 bytes on 32-bit platforms and 16
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bytes on 64-bit platforms. Therefore we can use the data
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directly and not use the kernel-provided data to seed a PRNG. */
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memcpy (&ret, dl_random, sizeof (ret));
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return ret;
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}
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static inline uintptr_t __attribute__ ((always_inline))
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_dl_setup_pointer_guard (void *dl_random, uintptr_t stack_chk_guard)
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{
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uintptr_t ret;
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#ifndef __ASSUME_AT_RANDOM
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if (dl_random == NULL)
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{
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ret = stack_chk_guard;
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# ifndef HP_TIMING_NONAVAIL
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hp_timing_t now;
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HP_TIMING_NOW (now);
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ret ^= now;
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# endif
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}
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else
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#endif
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memcpy (&ret, (char *) dl_random + sizeof (ret), sizeof (ret));
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return ret;
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}
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