diff options
| -rw-r--r-- | ChangeLog | 30 | ||||
| -rw-r--r-- | NEWS | 12 | ||||
| -rw-r--r-- | csu/libc-start.c | 16 | ||||
| -rw-r--r-- | elf/Makefile | 9 | ||||
| -rw-r--r-- | elf/tst-ptrguard1-static.c | 1 | ||||
| -rw-r--r-- | elf/tst-ptrguard1.c | 202 | ||||
| -rw-r--r-- | ports/ChangeLog.ia64 | 5 | ||||
| -rw-r--r-- | ports/ChangeLog.tile | 5 | ||||
| -rw-r--r-- | ports/sysdeps/ia64/stackguard-macros.h | 3 | ||||
| -rw-r--r-- | ports/sysdeps/tile/stackguard-macros.h | 6 | ||||
| -rw-r--r-- | sysdeps/generic/stackguard-macros.h | 3 | ||||
| -rw-r--r-- | sysdeps/i386/stackguard-macros.h | 8 | ||||
| -rw-r--r-- | sysdeps/powerpc/powerpc32/stackguard-macros.h | 10 | ||||
| -rw-r--r-- | sysdeps/powerpc/powerpc64/stackguard-macros.h | 10 | ||||
| -rw-r--r-- | sysdeps/s390/s390-32/stackguard-macros.h | 11 | ||||
| -rw-r--r-- | sysdeps/s390/s390-64/stackguard-macros.h | 14 | ||||
| -rw-r--r-- | sysdeps/sparc/sparc32/stackguard-macros.h | 3 | ||||
| -rw-r--r-- | sysdeps/sparc/sparc64/stackguard-macros.h | 3 | ||||
| -rw-r--r-- | sysdeps/x86_64/stackguard-macros.h | 5 |
19 files changed, 351 insertions, 5 deletions
@@ -1,3 +1,33 @@ +2013-09-23 Carlos O'Donell <carlos@redhat.com> + + [BZ #15754] + * elf/Makefile (tests): Add tst-ptrguard1. + (tests-static): Add tst-ptrguard1-static. + (tst-ptrguard1-ARGS): Define. + (tst-ptrguard1-static-ARGS): Define. + * elf/tst-ptrguard1.c: New file. + * elf/tst-ptrguard1-static.c: New file. + * sysdeps/x86_64/stackguard-macros.h: Define POINTER_CHK_GUARD. + * sysdeps/i386/stackguard-macros.h: Likewise. + * sysdeps/powerpc/powerpc32/stackguard-macros.h: Likewise. + * sysdeps/powerpc/powerpc64/stackguard-macros.h: Likewise. + * sysdeps/s390/s390-32/stackguard-macros.h: Likewise. + * sysdeps/s390/s390-64/stackguard-macros.h: Likewise. + * sysdeps/sparc/sparc32/stackguard-macros.h: Likewise. + * sysdeps/sparc/sparc64/stackguard-macros.h: Likewise. + +2013-09-23 Hector Marco <hecmargi@upv.es> + Ismael Ripoll <iripoll@disca.upv.es> + Carlos O'Donell <carlos@redhat.com> + + [BZ #15754] + * sysdeps/generic/stackguard-macros.h: Define + __pointer_chk_guard_local and POINTER_CHK_GUARD. + * csu/libc-start.c [!SHARED && !THREAD_SET_POINTER_GUARD]: + Define __pointer_chk_guard_local. + (LIBC_START_MAIN) [!SHARED]: Call _dl_setup_pointer_guard. + Use THREAD_SET_POINTER_GUARD or set __pointer_chk_guard_local. + 2013-09-15 Vinitha Vijayan <vinitha.vijayann@gmail.com> [BZ #15859] @@ -10,9 +10,15 @@ Version 2.19 * The following bugs are resolved with this release: 13985, 14155, 14699, 15427, 15522, 15531, 15532, 15640, 15736, 15748, - 15749, 15797, 15844, 15849, 15855, 15856, 15857, 15859, 15867, 15886, - 15887, 15890, 15892, 15893, 15895, 15897, 15905, 15909, 15919, 15921, - 15923, 15939, 15963, 15966. + 15749, 15754, 15797, 15844, 15849, 15855, 15856, 15857, 15859, 15867, + 15886, 15887, 15890, 15892, 15893, 15895, 15897, 15905, 15909, 15919, + 15921, 15923, 15939, 15963, 15966. + +* CVE-2013-4788 The pointer guard used for pointer mangling was not + initialized for static applications resulting in the security feature + being disabled. The pointer guard is now correctly initialized to a + random value for static applications. Existing static applications need + to be recompiled to take advantage of the fix (bug 15754). * CVE-2013-4237 The readdir_r function could write more than NAME_MAX bytes to the d_name member of struct dirent, or omit the terminating NUL diff --git a/csu/libc-start.c b/csu/libc-start.c index e5da3efd06..c898d06b03 100644 --- a/csu/libc-start.c +++ b/csu/libc-start.c @@ -37,6 +37,12 @@ extern void __pthread_initialize_minimal (void); in thread local area. */ uintptr_t __stack_chk_guard attribute_relro; # endif +# ifndef THREAD_SET_POINTER_GUARD +/* Only exported for architectures that don't store the pointer guard + value in thread local area. */ +uintptr_t __pointer_chk_guard_local + attribute_relro attribute_hidden __attribute__ ((nocommon)); +# endif #endif #ifdef HAVE_PTR_NTHREADS @@ -195,6 +201,16 @@ LIBC_START_MAIN (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL), # else __stack_chk_guard = stack_chk_guard; # endif + + /* Set up the pointer guard value. */ + uintptr_t pointer_chk_guard = _dl_setup_pointer_guard (_dl_random, + stack_chk_guard); +# ifdef THREAD_SET_POINTER_GUARD + THREAD_SET_POINTER_GUARD (pointer_chk_guard); +# else + __pointer_chk_guard_local = pointer_chk_guard; +# endif + #endif /* Register the destructor of the dynamic linker if there is any. */ diff --git a/elf/Makefile b/elf/Makefile index aaa9534b2e..cb8da9398a 100644 --- a/elf/Makefile +++ b/elf/Makefile @@ -121,7 +121,8 @@ endif tests = tst-tls1 tst-tls2 tst-tls9 tst-leaks1 \ tst-array1 tst-array2 tst-array3 tst-array4 tst-array5 tests-static = tst-tls1-static tst-tls2-static tst-stackguard1-static \ - tst-leaks1-static tst-array1-static tst-array5-static + tst-leaks1-static tst-array1-static tst-array5-static \ + tst-ptrguard1-static ifeq (yes,$(build-shared)) tests-static += tst-tls9-static tst-tls9-static-ENV = \ @@ -145,7 +146,8 @@ tests += loadtest restest1 preloadtest loadfail multiload origtest resolvfail \ tst-audit1 tst-audit2 tst-audit8 \ tst-stackguard1 tst-addr1 tst-thrlock \ tst-unique1 tst-unique2 tst-unique3 tst-unique4 \ - tst-initorder tst-initorder2 tst-relsort1 tst-null-argv + tst-initorder tst-initorder2 tst-relsort1 tst-null-argv \ + tst-ptrguard1 # reldep9 test-srcs = tst-pathopt selinux-enabled := $(shell cat /selinux/enforce 2> /dev/null) @@ -1016,6 +1018,9 @@ LDFLAGS-order2mod2.so = $(no-as-needed) tst-stackguard1-ARGS = --command "$(host-test-program-cmd) --child" tst-stackguard1-static-ARGS = --command "$(objpfx)tst-stackguard1-static --child" +tst-ptrguard1-ARGS = --command "$(host-test-program-cmd) --child" +tst-ptrguard1-static-ARGS = --command "$(objpfx)tst-ptrguard1-static --child" + $(objpfx)tst-leaks1: $(libdl) $(objpfx)tst-leaks1-mem: $(objpfx)tst-leaks1.out $(common-objpfx)malloc/mtrace $(objpfx)tst-leaks1.mtrace > $@ diff --git a/elf/tst-ptrguard1-static.c b/elf/tst-ptrguard1-static.c new file mode 100644 index 0000000000..7aff3b7b5d --- /dev/null +++ b/elf/tst-ptrguard1-static.c @@ -0,0 +1 @@ +#include "tst-ptrguard1.c" diff --git a/elf/tst-ptrguard1.c b/elf/tst-ptrguard1.c new file mode 100644 index 0000000000..c344a04db1 --- /dev/null +++ b/elf/tst-ptrguard1.c @@ -0,0 +1,202 @@ +/* Copyright (C) 2013 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 + <http://www.gnu.org/licenses/>. */ + +#include <errno.h> +#include <stdbool.h> +#include <stdio.h> +#include <stdlib.h> +#include <string.h> +#include <sys/wait.h> +#include <stackguard-macros.h> +#include <tls.h> +#include <unistd.h> + +#ifndef POINTER_CHK_GUARD +extern uintptr_t __pointer_chk_guard; +# define POINTER_CHK_GUARD __pointer_chk_guard +#endif + +static const char *command; +static bool child; +static uintptr_t ptr_chk_guard_copy; +static bool ptr_chk_guard_copy_set; +static int fds[2]; + +static void __attribute__ ((constructor)) +con (void) +{ + ptr_chk_guard_copy = POINTER_CHK_GUARD; + ptr_chk_guard_copy_set = true; +} + +static int +uintptr_t_cmp (const void *a, const void *b) +{ + if (*(uintptr_t *) a < *(uintptr_t *) b) + return 1; + if (*(uintptr_t *) a > *(uintptr_t *) b) + return -1; + return 0; +} + +static int +do_test (void) +{ + if (!ptr_chk_guard_copy_set) + { + puts ("constructor has not been run"); + return 1; + } + + if (ptr_chk_guard_copy != POINTER_CHK_GUARD) + { + puts ("POINTER_CHK_GUARD changed between constructor and do_test"); + return 1; + } + + if (child) + { + write (2, &ptr_chk_guard_copy, sizeof (ptr_chk_guard_copy)); + return 0; + } + + if (command == NULL) + { + puts ("missing --command or --child argument"); + return 1; + } + +#define N 16 + uintptr_t child_ptr_chk_guards[N + 1]; + child_ptr_chk_guards[N] = ptr_chk_guard_copy; + int i; + for (i = 0; i < N; ++i) + { + if (pipe (fds) < 0) + { + printf ("couldn't create pipe: %m\n"); + return 1; + } + + pid_t pid = fork (); + if (pid < 0) + { + printf ("fork failed: %m\n"); + return 1; + } + + if (!pid) + { + if (ptr_chk_guard_copy != POINTER_CHK_GUARD) + { + puts ("POINTER_CHK_GUARD changed after fork"); + exit (1); + } + + close (fds[0]); + close (2); + dup2 (fds[1], 2); + close (fds[1]); + + system (command); + exit (0); + } + + close (fds[1]); + + if (TEMP_FAILURE_RETRY (read (fds[0], &child_ptr_chk_guards[i], + sizeof (uintptr_t))) != sizeof (uintptr_t)) + { + puts ("could not read ptr_chk_guard value from child"); + return 1; + } + + close (fds[0]); + + pid_t termpid; + int status; + termpid = TEMP_FAILURE_RETRY (waitpid (pid, &status, 0)); + if (termpid == -1) + { + printf ("waitpid failed: %m\n"); + return 1; + } + else if (termpid != pid) + { + printf ("waitpid returned %ld != %ld\n", + (long int) termpid, (long int) pid); + return 1; + } + else if (!WIFEXITED (status) || WEXITSTATUS (status)) + { + puts ("child hasn't exited with exit status 0"); + return 1; + } + } + + qsort (child_ptr_chk_guards, N + 1, sizeof (uintptr_t), uintptr_t_cmp); + + /* The default pointer guard is the same as the default stack guard. + They are only set to default if dl_random is NULL. */ + uintptr_t default_guard = 0; + unsigned char *p = (unsigned char *) &default_guard; + p[sizeof (uintptr_t) - 1] = 255; + p[sizeof (uintptr_t) - 2] = '\n'; + p[0] = 0; + + /* Test if the pointer guard canaries are either randomized, + or equal to the default pointer guard value. + Even with randomized pointer guards it might happen + that the random number generator generates the same + values, but if that happens in more than half from + the 16 runs, something is very wrong. */ + int ndifferences = 0; + int ndefaults = 0; + for (i = 0; i < N; ++i) + { + if (child_ptr_chk_guards[i] != child_ptr_chk_guards[i+1]) + ndifferences++; + else if (child_ptr_chk_guards[i] == default_guard) + ndefaults++; + } + + printf ("differences %d defaults %d\n", ndifferences, ndefaults); + + if (ndifferences < N / 2 && ndefaults < N / 2) + { + puts ("pointer guard values are not randomized enough"); + puts ("nor equal to the default value"); + return 1; + } + + return 0; +} + +#define OPT_COMMAND 10000 +#define OPT_CHILD 10001 +#define CMDLINE_OPTIONS \ + { "command", required_argument, NULL, OPT_COMMAND }, \ + { "child", no_argument, NULL, OPT_CHILD }, +#define CMDLINE_PROCESS \ + case OPT_COMMAND: \ + command = optarg; \ + break; \ + case OPT_CHILD: \ + child = true; \ + break; +#define TEST_FUNCTION do_test () +#include "../test-skeleton.c" diff --git a/ports/ChangeLog.ia64 b/ports/ChangeLog.ia64 index efe352e6bb..272f73a1b3 100644 --- a/ports/ChangeLog.ia64 +++ b/ports/ChangeLog.ia64 @@ -1,3 +1,8 @@ +2013-09-22 Carlos O'Donell <carlos@redhat.com> + + [BZ #15754] + * sysdeps/ia64/stackguard-macros.h: Define POINTER_CHK_GUARD. + 2013-08-30 Ondřej Bílka <neleai@seznam.cz> * sysdeps/ia64/fpu/libm_reduce.S: Fix typos. diff --git a/ports/ChangeLog.tile b/ports/ChangeLog.tile index 79d15b464c..dc2e7e412d 100644 --- a/ports/ChangeLog.tile +++ b/ports/ChangeLog.tile @@ -1,3 +1,8 @@ +2013-09-22 Carlos O'Donell <carlos@redhat.com> + + [BZ #15754] + * sysdeps/tile/stackguard-macros.h: Define POINTER_CHK_GUARD. + 2013-09-20 Andreas Schwab <schwab@linux-m68k.org> * sysdeps/tile/ffs.c (__ffs): Define as hidden. diff --git a/ports/sysdeps/ia64/stackguard-macros.h b/ports/sysdeps/ia64/stackguard-macros.h index dc683c28c5..390729327a 100644 --- a/ports/sysdeps/ia64/stackguard-macros.h +++ b/ports/sysdeps/ia64/stackguard-macros.h @@ -2,3 +2,6 @@ #define STACK_CHK_GUARD \ ({ uintptr_t x; asm ("adds %0 = -8, r13;; ld8 %0 = [%0]" : "=r" (x)); x; }) + +#define POINTER_CHK_GUARD \ + ({ uintptr_t x; asm ("adds %0 = -16, r13;; ld8 %0 = [%0]" : "=r" (x)); x; }) diff --git a/ports/sysdeps/tile/stackguard-macros.h b/ports/sysdeps/tile/stackguard-macros.h index 589ea2b0d8..f2e041b99b 100644 --- a/ports/sysdeps/tile/stackguard-macros.h +++ b/ports/sysdeps/tile/stackguard-macros.h @@ -4,11 +4,17 @@ # if __WORDSIZE == 64 # define STACK_CHK_GUARD \ ({ uintptr_t x; asm ("addi %0, tp, -16; ld %0, %0" : "=r" (x)); x; }) +# define POINTER_CHK_GUARD \ + ({ uintptr_t x; asm ("addi %0, tp, -24; ld %0, %0" : "=r" (x)); x; }) # else # define STACK_CHK_GUARD \ ({ uintptr_t x; asm ("addi %0, tp, -8; ld4s %0, %0" : "=r" (x)); x; }) +# define POINTER_CHK_GUARD \ + ({ uintptr_t x; asm ("addi %0, tp, -12; ld4s %0, %0" : "=r" (x)); x; }) # endif #else # define STACK_CHK_GUARD \ ({ uintptr_t x; asm ("addi %0, tp, -8; lw %0, %0" : "=r" (x)); x; }) +# define POINTER_CHK_GUARD \ + ({ uintptr_t x; asm ("addi %0, tp, -12; lw %0, %0" : "=r" (x)); x; }) #endif diff --git a/sysdeps/generic/stackguard-macros.h b/sysdeps/generic/stackguard-macros.h index ababf65d37..4fa3d96f79 100644 --- a/sysdeps/generic/stackguard-macros.h +++ b/sysdeps/generic/stackguard-macros.h @@ -2,3 +2,6 @@ extern uintptr_t __stack_chk_guard; #define STACK_CHK_GUARD __stack_chk_guard + +extern uintptr_t __pointer_chk_guard_local; +#define POINTER_CHK_GUARD __pointer_chk_guard_local diff --git a/sysdeps/i386/stackguard-macros.h b/sysdeps/i386/stackguard-macros.h index 8c31e197e1..039762927c 100644 --- a/sysdeps/i386/stackguard-macros.h +++ b/sysdeps/i386/stackguard-macros.h @@ -2,3 +2,11 @@ #define STACK_CHK_GUARD \ ({ uintptr_t x; asm ("movl %%gs:0x14, %0" : "=r" (x)); x; }) + +#define POINTER_CHK_GUARD \ + ({ \ + uintptr_t x; \ + asm ("movl %%gs:%c1, %0" : "=r" (x) \ + : "i" (offsetof (tcbhead_t, pointer_guard))); \ + x; \ + }) diff --git a/sysdeps/powerpc/powerpc32/stackguard-macros.h b/sysdeps/powerpc/powerpc32/stackguard-macros.h index 839f6a4b9b..b3d0af830f 100644 --- a/sysdeps/powerpc/powerpc32/stackguard-macros.h +++ b/sysdeps/powerpc/powerpc32/stackguard-macros.h @@ -2,3 +2,13 @@ #define STACK_CHK_GUARD \ ({ uintptr_t x; asm ("lwz %0,-28680(2)" : "=r" (x)); x; }) + +#define POINTER_CHK_GUARD \ + ({ \ + uintptr_t x; \ + asm ("lwz %0,%1(2)" \ + : "=r" (x) \ + : "i" (offsetof (tcbhead_t, pointer_guard) - TLS_TCB_OFFSET - sizeof (tcbhead_t)) \ + ); \ + x; \ + }) diff --git a/sysdeps/powerpc/powerpc64/stackguard-macros.h b/sysdeps/powerpc/powerpc64/stackguard-macros.h index 9da879c611..4620f96b86 100644 --- a/sysdeps/powerpc/powerpc64/stackguard-macros.h +++ b/sysdeps/powerpc/powerpc64/stackguard-macros.h @@ -2,3 +2,13 @@ #define STACK_CHK_GUARD \ ({ uintptr_t x; asm ("ld %0,-28688(13)" : "=r" (x)); x; }) + +#define POINTER_CHK_GUARD \ + ({ \ + uintptr_t x; \ + asm ("ld %0,%1(2)" \ + : "=r" (x) \ + : "i" (offsetof (tcbhead_t, pointer_guard) - TLS_TCB_OFFSET - sizeof (tcbhead_t)) \ + ); \ + x; \ + }) diff --git a/sysdeps/s390/s390-32/stackguard-macros.h b/sysdeps/s390/s390-32/stackguard-macros.h index b74c5799b3..449e8d488f 100644 --- a/sysdeps/s390/s390-32/stackguard-macros.h +++ b/sysdeps/s390/s390-32/stackguard-macros.h @@ -2,3 +2,14 @@ #define STACK_CHK_GUARD \ ({ uintptr_t x; asm ("ear %0,%%a0; l %0,0x14(%0)" : "=a" (x)); x; }) + +/* On s390/s390x there is no unique pointer guard, instead we use the + same value as the stack guard. */ +#define POINTER_CHK_GUARD \ + ({ \ + uintptr_t x; \ + asm ("ear %0,%%a0; l %0,%1(%0)" \ + : "=a" (x) \ + : "i" (offsetof (tcbhead_t, stack_guard))); \ + x; \ + }) diff --git a/sysdeps/s390/s390-64/stackguard-macros.h b/sysdeps/s390/s390-64/stackguard-macros.h index 0cebb5f022..c8270fbe79 100644 --- a/sysdeps/s390/s390-64/stackguard-macros.h +++ b/sysdeps/s390/s390-64/stackguard-macros.h @@ -2,3 +2,17 @@ #define STACK_CHK_GUARD \ ({ uintptr_t x; asm ("ear %0,%%a0; sllg %0,%0,32; ear %0,%%a1; lg %0,0x28(%0)" : "=a" (x)); x; }) + +/* On s390/s390x there is no unique pointer guard, instead we use the + same value as the stack guard. */ +#define POINTER_CHK_GUARD \ + ({ \ + uintptr_t x; \ + asm ("ear %0,%%a0;" \ + "sllg %0,%0,32;" \ + "ear %0,%%a1;" \ + "lg %0,%1(%0)" \ + : "=a" (x) \ + : "i" (offsetof (tcbhead_t, stack_guard))); \ + x; \ + }) diff --git a/sysdeps/sparc/sparc32/stackguard-macros.h b/sysdeps/sparc/sparc32/stackguard-macros.h index c0b02b0bbd..1eef0f19f0 100644 --- a/sysdeps/sparc/sparc32/stackguard-macros.h +++ b/sysdeps/sparc/sparc32/stackguard-macros.h @@ -2,3 +2,6 @@ #define STACK_CHK_GUARD \ ({ uintptr_t x; asm ("ld [%%g7+0x14], %0" : "=r" (x)); x; }) + +#define POINTER_CHK_GUARD \ + ({ uintptr_t x; asm ("ld [%%g7+0x18], %0" : "=r" (x)); x; }) diff --git a/sysdeps/sparc/sparc64/stackguard-macros.h b/sysdeps/sparc/sparc64/stackguard-macros.h index 80f063558a..cc0c12c041 100644 --- a/sysdeps/sparc/sparc64/stackguard-macros.h +++ b/sysdeps/sparc/sparc64/stackguard-macros.h @@ -2,3 +2,6 @@ #define STACK_CHK_GUARD \ ({ uintptr_t x; asm ("ldx [%%g7+0x28], %0" : "=r" (x)); x; }) + +#define POINTER_CHK_GUARD \ + ({ uintptr_t x; asm ("ldx [%%g7+0x30], %0" : "=r" (x)); x; }) diff --git a/sysdeps/x86_64/stackguard-macros.h b/sysdeps/x86_64/stackguard-macros.h index d7fedb3737..1948800cd0 100644 --- a/sysdeps/x86_64/stackguard-macros.h +++ b/sysdeps/x86_64/stackguard-macros.h @@ -4,3 +4,8 @@ ({ uintptr_t x; \ asm ("mov %%fs:%c1, %0" : "=r" (x) \ : "i" (offsetof (tcbhead_t, stack_guard))); x; }) + +#define POINTER_CHK_GUARD \ + ({ uintptr_t x; \ + asm ("mov %%fs:%c1, %0" : "=r" (x) \ + : "i" (offsetof (tcbhead_t, pointer_guard))); x; }) |