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File _service:tar_scm:0034-Backport-sanitizer-Fix-asan-against-glibc-2.34-PR100.patch of Package gcc
From 2969f5190561e26a8ce42d5dcda43ef59e0b6d32 Mon Sep 17 00:00:00 2001 From: liyancheng <412998149@qq.com> Date: Tue, 26 Apr 2022 19:59:09 +0800 Subject: [PATCH] [Backport] sanitizer: Fix asan against glibc 2.34 [PR100114] Reference: https://gcc.gnu.org/git/gitweb.cgi?p=gcc.git;h=d9f462fb372fb02da032cefd6b091d7582c425ae 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. --- .../sanitizer_common/sanitizer_posix_libcdep.cpp | 13 ++++++++----- 1 file changed, 8 insertions(+), 5 deletions(-) diff --git a/libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cpp b/libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cpp index 304b3a01a..ac88fbe07 100644 --- a/libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cpp +++ b/libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cpp @@ -169,7 +169,11 @@ 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; @@ -180,10 +184,9 @@ 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)); } @@ -191,7 +194,7 @@ 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); } -- 2.25.1
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