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authorJakub Jelinek <jakub@redhat.com>2021-04-17 11:27:14 +0200
committerJakub Jelinek <jakub@redhat.com>2021-04-17 11:27:14 +0200
commitd9f462fb372fb02da032cefd6b091d7582c425ae (patch)
tree6b683d7a74cceaeca92c798254f0fde039765487 /libsanitizer
parent8ae884c09fbba91e9cec391290ee4a2859e7ff41 (diff)
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sanitizer: Fix asan against glibc 2.34 [PR100114]
As mentioned in the PR, SIGSTKSZ is no longer a compile time constant in glibc 2.34 and later, so static const uptr kAltStackSize = SIGSTKSZ * 4; needs dynamic initialization, but is used by a function called indirectly from .preinit_array and therefore before the variable is constructed. This results in using 0 size instead and all asan instrumented programs die with: ==91==ERROR: AddressSanitizer failed to allocate 0x0 (0) bytes of SetAlternateSignalStack (error code: 22) Here is a cherry-pick from upstream to fix this. 2021-04-17 Jakub Jelinek <jakub@redhat.com> PR sanitizer/100114 * sanitizer_common/sanitizer_posix_libcdep.cpp: Cherry-pick llvm-project revisions 82150606fb11d28813ae6da1101f5bda638165fe and b93629dd335ffee2fc4b9b619bf86c3f9e6b0023.
Diffstat (limited to 'libsanitizer')
-rw-r--r--libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cpp13
1 files changed, 8 insertions, 5 deletions
diff --git a/libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cpp b/libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cpp
index d29438c..7ff48c3 100644
--- a/libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cpp
+++ b/libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cpp
@@ -165,7 +165,11 @@ bool SupportsColoredOutput(fd_t fd) {
#if !SANITIZER_GO
// TODO(glider): different tools may require different altstack size.
-static const uptr kAltStackSize = SIGSTKSZ * 4; // SIGSTKSZ is not enough.
+static uptr GetAltStackSize() {
+ // SIGSTKSZ is not enough.
+ static const uptr kAltStackSize = SIGSTKSZ * 4;
+ return kAltStackSize;
+}
void SetAlternateSignalStack() {
stack_t altstack, oldstack;
@@ -176,10 +180,9 @@ void SetAlternateSignalStack() {
// TODO(glider): the mapped stack should have the MAP_STACK flag in the
// future. It is not required by man 2 sigaltstack now (they're using
// malloc()).
- void* base = MmapOrDie(kAltStackSize, __func__);
- altstack.ss_sp = (char*) base;
+ altstack.ss_size = GetAltStackSize();
+ altstack.ss_sp = (char *)MmapOrDie(altstack.ss_size, __func__);
altstack.ss_flags = 0;
- altstack.ss_size = kAltStackSize;
CHECK_EQ(0, sigaltstack(&altstack, nullptr));
}
@@ -187,7 +190,7 @@ void UnsetAlternateSignalStack() {
stack_t altstack, oldstack;
altstack.ss_sp = nullptr;
altstack.ss_flags = SS_DISABLE;
- altstack.ss_size = kAltStackSize; // Some sane value required on Darwin.
+ altstack.ss_size = GetAltStackSize(); // Some sane value required on Darwin.
CHECK_EQ(0, sigaltstack(&altstack, &oldstack));
UnmapOrDie(oldstack.ss_sp, oldstack.ss_size);
}