485 lines
15 KiB
Diff
485 lines
15 KiB
Diff
diff --git a/csu/libc-start.c b/csu/libc-start.c
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index e5da3ef..c898d06 100644
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--- a/csu/libc-start.c
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+++ b/csu/libc-start.c
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@@ -37,6 +37,12 @@ extern void __pthread_initialize_minimal (void);
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in thread local area. */
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uintptr_t __stack_chk_guard attribute_relro;
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# endif
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+# ifndef THREAD_SET_POINTER_GUARD
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+/* Only exported for architectures that don't store the pointer guard
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+ value in thread local area. */
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+uintptr_t __pointer_chk_guard_local
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+ attribute_relro attribute_hidden __attribute__ ((nocommon));
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+# endif
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#endif
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#ifdef HAVE_PTR_NTHREADS
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@@ -195,6 +201,16 @@ LIBC_START_MAIN (int (*main) (int, char **, char ** MAIN_AUXVEC_DECL),
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# else
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__stack_chk_guard = stack_chk_guard;
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# endif
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+
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+ /* Set up the pointer guard value. */
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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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+# else
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+ __pointer_chk_guard_local = pointer_chk_guard;
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+# endif
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+
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#endif
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/* Register the destructor of the dynamic linker if there is any. */
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diff --git a/elf/Makefile b/elf/Makefile
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index aaa9534..cb8da93 100644
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--- a/elf/Makefile
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+++ b/elf/Makefile
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@@ -121,7 +121,8 @@ endif
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tests = tst-tls1 tst-tls2 tst-tls9 tst-leaks1 \
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tst-array1 tst-array2 tst-array3 tst-array4 tst-array5
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tests-static = tst-tls1-static tst-tls2-static tst-stackguard1-static \
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- tst-leaks1-static tst-array1-static tst-array5-static
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+ tst-leaks1-static tst-array1-static tst-array5-static \
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+ tst-ptrguard1-static
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ifeq (yes,$(build-shared))
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tests-static += tst-tls9-static
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tst-tls9-static-ENV = \
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@@ -145,7 +146,8 @@ tests += loadtest restest1 preloadtest loadfail multiload origtest resolvfail \
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tst-audit1 tst-audit2 tst-audit8 \
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tst-stackguard1 tst-addr1 tst-thrlock \
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tst-unique1 tst-unique2 tst-unique3 tst-unique4 \
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- tst-initorder tst-initorder2 tst-relsort1 tst-null-argv
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+ tst-initorder tst-initorder2 tst-relsort1 tst-null-argv \
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+ tst-ptrguard1
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# reldep9
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test-srcs = tst-pathopt
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selinux-enabled := $(shell cat /selinux/enforce 2> /dev/null)
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@@ -1016,6 +1018,9 @@ LDFLAGS-order2mod2.so = $(no-as-needed)
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tst-stackguard1-ARGS = --command "$(host-test-program-cmd) --child"
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tst-stackguard1-static-ARGS = --command "$(objpfx)tst-stackguard1-static --child"
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+tst-ptrguard1-ARGS = --command "$(host-test-program-cmd) --child"
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+tst-ptrguard1-static-ARGS = --command "$(objpfx)tst-ptrguard1-static --child"
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+
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$(objpfx)tst-leaks1: $(libdl)
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$(objpfx)tst-leaks1-mem: $(objpfx)tst-leaks1.out
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$(common-objpfx)malloc/mtrace $(objpfx)tst-leaks1.mtrace > $@
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diff --git a/elf/tst-ptrguard1-static.c b/elf/tst-ptrguard1-static.c
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new file mode 100644
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index 0000000..7aff3b7
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--- /dev/null
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+++ b/elf/tst-ptrguard1-static.c
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@@ -0,0 +1 @@
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+#include "tst-ptrguard1.c"
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diff --git a/elf/tst-ptrguard1.c b/elf/tst-ptrguard1.c
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new file mode 100644
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index 0000000..c344a04
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--- /dev/null
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+++ b/elf/tst-ptrguard1.c
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@@ -0,0 +1,202 @@
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+/* Copyright (C) 2013 Free Software Foundation, Inc.
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+ This file is part of the GNU C Library.
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+
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+ The GNU C Library is free software; you can redistribute it and/or
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+ modify it under the terms of the GNU Lesser General Public
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+ License as published by the Free Software Foundation; either
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+ version 2.1 of the License, or (at your option) any later version.
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+
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+ The GNU C Library is distributed in the hope that it will be useful,
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+ but WITHOUT ANY WARRANTY; without even the implied warranty of
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+ MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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+ Lesser General Public License for more details.
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+
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+ You should have received a copy of the GNU Lesser General Public
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+ License along with the GNU C Library; if not, see
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+ <http://www.gnu.org/licenses/>. */
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+
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+#include <errno.h>
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+#include <stdbool.h>
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+#include <stdio.h>
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+#include <stdlib.h>
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+#include <string.h>
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+#include <sys/wait.h>
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+#include <stackguard-macros.h>
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+#include <tls.h>
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+#include <unistd.h>
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+
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+#ifndef POINTER_CHK_GUARD
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+extern uintptr_t __pointer_chk_guard;
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+# define POINTER_CHK_GUARD __pointer_chk_guard
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+#endif
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+
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+static const char *command;
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+static bool child;
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+static uintptr_t ptr_chk_guard_copy;
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+static bool ptr_chk_guard_copy_set;
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+static int fds[2];
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+
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+static void __attribute__ ((constructor))
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+con (void)
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+{
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+ ptr_chk_guard_copy = POINTER_CHK_GUARD;
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+ ptr_chk_guard_copy_set = true;
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+}
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+
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+static int
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+uintptr_t_cmp (const void *a, const void *b)
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+{
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+ if (*(uintptr_t *) a < *(uintptr_t *) b)
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+ return 1;
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+ if (*(uintptr_t *) a > *(uintptr_t *) b)
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+ return -1;
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+ return 0;
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+}
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+
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+static int
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+do_test (void)
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+{
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+ if (!ptr_chk_guard_copy_set)
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+ {
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+ puts ("constructor has not been run");
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+ return 1;
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+ }
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+
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+ if (ptr_chk_guard_copy != POINTER_CHK_GUARD)
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+ {
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+ puts ("POINTER_CHK_GUARD changed between constructor and do_test");
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+ return 1;
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+ }
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+
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+ if (child)
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+ {
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+ write (2, &ptr_chk_guard_copy, sizeof (ptr_chk_guard_copy));
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+ return 0;
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+ }
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+
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+ if (command == NULL)
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+ {
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+ puts ("missing --command or --child argument");
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+ return 1;
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+ }
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+
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+#define N 16
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+ uintptr_t child_ptr_chk_guards[N + 1];
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+ child_ptr_chk_guards[N] = ptr_chk_guard_copy;
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+ int i;
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+ for (i = 0; i < N; ++i)
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+ {
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+ if (pipe (fds) < 0)
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+ {
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+ printf ("couldn't create pipe: %m\n");
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+ return 1;
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+ }
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+
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+ pid_t pid = fork ();
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+ if (pid < 0)
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+ {
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+ printf ("fork failed: %m\n");
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+ return 1;
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+ }
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+
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+ if (!pid)
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+ {
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+ if (ptr_chk_guard_copy != POINTER_CHK_GUARD)
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+ {
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+ puts ("POINTER_CHK_GUARD changed after fork");
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+ exit (1);
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+ }
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+
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+ close (fds[0]);
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+ close (2);
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+ dup2 (fds[1], 2);
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+ close (fds[1]);
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+
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+ system (command);
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+ exit (0);
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+ }
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+
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+ close (fds[1]);
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+
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+ if (TEMP_FAILURE_RETRY (read (fds[0], &child_ptr_chk_guards[i],
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+ sizeof (uintptr_t))) != sizeof (uintptr_t))
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+ {
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+ puts ("could not read ptr_chk_guard value from child");
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+ return 1;
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+ }
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+
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+ close (fds[0]);
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+
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+ pid_t termpid;
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+ int status;
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+ termpid = TEMP_FAILURE_RETRY (waitpid (pid, &status, 0));
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+ if (termpid == -1)
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+ {
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+ printf ("waitpid failed: %m\n");
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+ return 1;
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+ }
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+ else if (termpid != pid)
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+ {
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+ printf ("waitpid returned %ld != %ld\n",
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+ (long int) termpid, (long int) pid);
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+ return 1;
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+ }
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+ else if (!WIFEXITED (status) || WEXITSTATUS (status))
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+ {
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+ puts ("child hasn't exited with exit status 0");
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+ return 1;
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+ }
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+ }
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+
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+ qsort (child_ptr_chk_guards, N + 1, sizeof (uintptr_t), uintptr_t_cmp);
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+
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+ /* The default pointer guard is the same as the default stack guard.
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+ They are only set to default if dl_random is NULL. */
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+ uintptr_t default_guard = 0;
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+ unsigned char *p = (unsigned char *) &default_guard;
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+ p[sizeof (uintptr_t) - 1] = 255;
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+ p[sizeof (uintptr_t) - 2] = '\n';
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+ p[0] = 0;
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+
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+ /* Test if the pointer guard canaries are either randomized,
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+ or equal to the default pointer guard value.
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+ Even with randomized pointer guards it might happen
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+ that the random number generator generates the same
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+ values, but if that happens in more than half from
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+ the 16 runs, something is very wrong. */
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+ int ndifferences = 0;
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+ int ndefaults = 0;
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+ for (i = 0; i < N; ++i)
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+ {
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+ if (child_ptr_chk_guards[i] != child_ptr_chk_guards[i+1])
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+ ndifferences++;
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+ else if (child_ptr_chk_guards[i] == default_guard)
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+ ndefaults++;
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+ }
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+
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+ printf ("differences %d defaults %d\n", ndifferences, ndefaults);
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+
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+ if (ndifferences < N / 2 && ndefaults < N / 2)
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+ {
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+ puts ("pointer guard values are not randomized enough");
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+ puts ("nor equal to the default value");
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+ return 1;
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+ }
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+
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+ return 0;
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+}
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+
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+#define OPT_COMMAND 10000
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+#define OPT_CHILD 10001
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+#define CMDLINE_OPTIONS \
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+ { "command", required_argument, NULL, OPT_COMMAND }, \
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+ { "child", no_argument, NULL, OPT_CHILD },
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+#define CMDLINE_PROCESS \
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+ case OPT_COMMAND: \
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+ command = optarg; \
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+ break; \
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+ case OPT_CHILD: \
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+ child = true; \
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+ break;
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+#define TEST_FUNCTION do_test ()
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+#include "../test-skeleton.c"
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diff --git a/ports/sysdeps/ia64/stackguard-macros.h b/ports/sysdeps/ia64/stackguard-macros.h
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index dc683c2..3907293 100644
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--- a/ports/sysdeps/ia64/stackguard-macros.h
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+++ b/ports/sysdeps/ia64/stackguard-macros.h
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@@ -2,3 +2,6 @@
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#define STACK_CHK_GUARD \
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({ uintptr_t x; asm ("adds %0 = -8, r13;; ld8 %0 = [%0]" : "=r" (x)); x; })
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+
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+#define POINTER_CHK_GUARD \
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+ ({ uintptr_t x; asm ("adds %0 = -16, r13;; ld8 %0 = [%0]" : "=r" (x)); x; })
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diff --git a/ports/sysdeps/tile/stackguard-macros.h b/ports/sysdeps/tile/stackguard-macros.h
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index 589ea2b..f2e041b 100644
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--- a/ports/sysdeps/tile/stackguard-macros.h
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+++ b/ports/sysdeps/tile/stackguard-macros.h
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@@ -4,11 +4,17 @@
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# if __WORDSIZE == 64
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# define STACK_CHK_GUARD \
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({ uintptr_t x; asm ("addi %0, tp, -16; ld %0, %0" : "=r" (x)); x; })
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+# define POINTER_CHK_GUARD \
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+ ({ uintptr_t x; asm ("addi %0, tp, -24; ld %0, %0" : "=r" (x)); x; })
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# else
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# define STACK_CHK_GUARD \
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({ uintptr_t x; asm ("addi %0, tp, -8; ld4s %0, %0" : "=r" (x)); x; })
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+# define POINTER_CHK_GUARD \
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+ ({ uintptr_t x; asm ("addi %0, tp, -12; ld4s %0, %0" : "=r" (x)); x; })
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# endif
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#else
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# define STACK_CHK_GUARD \
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({ uintptr_t x; asm ("addi %0, tp, -8; lw %0, %0" : "=r" (x)); x; })
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+# define POINTER_CHK_GUARD \
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+ ({ uintptr_t x; asm ("addi %0, tp, -12; lw %0, %0" : "=r" (x)); x; })
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#endif
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diff --git a/sysdeps/generic/stackguard-macros.h b/sysdeps/generic/stackguard-macros.h
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index ababf65..4fa3d96 100644
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--- a/sysdeps/generic/stackguard-macros.h
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+++ b/sysdeps/generic/stackguard-macros.h
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@@ -2,3 +2,6 @@
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extern uintptr_t __stack_chk_guard;
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#define STACK_CHK_GUARD __stack_chk_guard
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+
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+extern uintptr_t __pointer_chk_guard_local;
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+#define POINTER_CHK_GUARD __pointer_chk_guard_local
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diff --git a/sysdeps/i386/stackguard-macros.h b/sysdeps/i386/stackguard-macros.h
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index 8c31e19..0397629 100644
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--- a/sysdeps/i386/stackguard-macros.h
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+++ b/sysdeps/i386/stackguard-macros.h
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@@ -2,3 +2,11 @@
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#define STACK_CHK_GUARD \
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({ uintptr_t x; asm ("movl %%gs:0x14, %0" : "=r" (x)); x; })
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+
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+#define POINTER_CHK_GUARD \
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+ ({ \
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+ uintptr_t x; \
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+ asm ("movl %%gs:%c1, %0" : "=r" (x) \
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+ : "i" (offsetof (tcbhead_t, pointer_guard))); \
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+ x; \
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+ })
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diff --git a/sysdeps/powerpc/powerpc32/stackguard-macros.h b/sysdeps/powerpc/powerpc32/stackguard-macros.h
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index 839f6a4..b3d0af8 100644
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--- a/sysdeps/powerpc/powerpc32/stackguard-macros.h
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+++ b/sysdeps/powerpc/powerpc32/stackguard-macros.h
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@@ -2,3 +2,13 @@
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#define STACK_CHK_GUARD \
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({ uintptr_t x; asm ("lwz %0,-28680(2)" : "=r" (x)); x; })
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+
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+#define POINTER_CHK_GUARD \
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+ ({ \
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+ uintptr_t x; \
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+ asm ("lwz %0,%1(2)" \
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+ : "=r" (x) \
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+ : "i" (offsetof (tcbhead_t, pointer_guard) - TLS_TCB_OFFSET - sizeof (tcbhead_t)) \
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+ ); \
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+ x; \
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+ })
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diff --git a/sysdeps/powerpc/powerpc64/stackguard-macros.h b/sysdeps/powerpc/powerpc64/stackguard-macros.h
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index 9da879c..4620f96 100644
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--- a/sysdeps/powerpc/powerpc64/stackguard-macros.h
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+++ b/sysdeps/powerpc/powerpc64/stackguard-macros.h
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@@ -2,3 +2,13 @@
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#define STACK_CHK_GUARD \
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({ uintptr_t x; asm ("ld %0,-28688(13)" : "=r" (x)); x; })
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+
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+#define POINTER_CHK_GUARD \
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+ ({ \
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+ uintptr_t x; \
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+ asm ("ld %0,%1(2)" \
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+ : "=r" (x) \
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+ : "i" (offsetof (tcbhead_t, pointer_guard) - TLS_TCB_OFFSET - sizeof (tcbhead_t)) \
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+ ); \
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+ x; \
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+ })
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diff --git a/sysdeps/s390/s390-32/stackguard-macros.h b/sysdeps/s390/s390-32/stackguard-macros.h
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index b74c579..449e8d4 100644
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--- a/sysdeps/s390/s390-32/stackguard-macros.h
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+++ b/sysdeps/s390/s390-32/stackguard-macros.h
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@@ -2,3 +2,14 @@
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#define STACK_CHK_GUARD \
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({ uintptr_t x; asm ("ear %0,%%a0; l %0,0x14(%0)" : "=a" (x)); x; })
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+
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+/* On s390/s390x there is no unique pointer guard, instead we use the
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+ same value as the stack guard. */
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+#define POINTER_CHK_GUARD \
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+ ({ \
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+ uintptr_t x; \
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+ asm ("ear %0,%%a0; l %0,%1(%0)" \
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+ : "=a" (x) \
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+ : "i" (offsetof (tcbhead_t, stack_guard))); \
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+ x; \
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+ })
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diff --git a/sysdeps/s390/s390-64/stackguard-macros.h b/sysdeps/s390/s390-64/stackguard-macros.h
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index 0cebb5f..c8270fb 100644
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--- a/sysdeps/s390/s390-64/stackguard-macros.h
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+++ b/sysdeps/s390/s390-64/stackguard-macros.h
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@@ -2,3 +2,17 @@
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#define STACK_CHK_GUARD \
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({ uintptr_t x; asm ("ear %0,%%a0; sllg %0,%0,32; ear %0,%%a1; lg %0,0x28(%0)" : "=a" (x)); x; })
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+
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+/* On s390/s390x there is no unique pointer guard, instead we use the
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+ same value as the stack guard. */
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+#define POINTER_CHK_GUARD \
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+ ({ \
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+ uintptr_t x; \
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+ asm ("ear %0,%%a0;" \
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+ "sllg %0,%0,32;" \
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+ "ear %0,%%a1;" \
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+ "lg %0,%1(%0)" \
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+ : "=a" (x) \
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+ : "i" (offsetof (tcbhead_t, stack_guard))); \
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+ x; \
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+ })
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diff --git a/sysdeps/sparc/sparc32/stackguard-macros.h b/sysdeps/sparc/sparc32/stackguard-macros.h
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|
index c0b02b0..1eef0f1 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 80f0635..cc0c12c 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 d7fedb3..1948800 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; })
|
|
diff --git a/elf/Makefile b/elf/Makefile
|
|
index cb8da93..27d249b 100644
|
|
--- a/elf/Makefile
|
|
+++ b/elf/Makefile
|
|
@@ -1019,6 +1019,9 @@ 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"
|
|
+# When built statically, the pointer guard interface uses
|
|
+# __pointer_chk_guard_local.
|
|
+CFLAGS-tst-ptrguard1-static.c = -DPTRGUARD_LOCAL
|
|
tst-ptrguard1-static-ARGS = --command "$(objpfx)tst-ptrguard1-static --child"
|
|
|
|
$(objpfx)tst-leaks1: $(libdl)
|
|
diff --git a/sysdeps/generic/stackguard-macros.h b/sysdeps/generic/stackguard-macros.h
|
|
index 4fa3d96..b4a6b23 100644
|
|
--- a/sysdeps/generic/stackguard-macros.h
|
|
+++ b/sysdeps/generic/stackguard-macros.h
|
|
@@ -3,5 +3,10 @@
|
|
extern uintptr_t __stack_chk_guard;
|
|
#define STACK_CHK_GUARD __stack_chk_guard
|
|
|
|
+#ifdef PTRGUARD_LOCAL
|
|
extern uintptr_t __pointer_chk_guard_local;
|
|
-#define POINTER_CHK_GUARD __pointer_chk_guard_local
|
|
+# define POINTER_CHK_GUARD __pointer_chk_guard_local
|
|
+#else
|
|
+extern uintptr_t __pointer_chk_guard;
|
|
+# define POINTER_CHK_GUARD __pointer_chk_guard
|
|
+#endif
|