70 lines
2.8 KiB
Diff
70 lines
2.8 KiB
Diff
From ef195a39d0d3b929cc676302d074b42c25460601 Mon Sep 17 00:00:00 2001
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From: Jakub Jelinek <jakub@redhat.com>
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Date: Sat, 17 Apr 2021 11:27:14 +0200
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Subject: [PATCH] sanitizer: Fix asan against glibc 2.34 [PR100114]
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As mentioned in the PR, SIGSTKSZ is no longer a compile time constant in
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glibc 2.34 and later, so
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static const uptr kAltStackSize = SIGSTKSZ * 4;
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needs dynamic initialization, but is used by a function called indirectly
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from .preinit_array and therefore before the variable is constructed.
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This results in using 0 size instead and all asan instrumented programs
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die with:
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==91==ERROR: AddressSanitizer failed to allocate 0x0 (0) bytes of SetAlternateSignalStack (error code: 22)
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Here is a cherry-pick from upstream to fix this.
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2021-04-17 Jakub Jelinek <jakub@redhat.com>
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PR sanitizer/100114
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* sanitizer_common/sanitizer_posix_libcdep.cc: Cherry-pick
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llvm-project revisions 82150606fb11d28813ae6da1101f5bda638165fe
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and b93629dd335ffee2fc4b9b619bf86c3f9e6b0023.
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(cherry picked from commit 950bac27d63c1c2ac3a6ed867692d6a13f21feb3)
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---
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.../sanitizer_common/sanitizer_posix_libcdep.cc | 13 ++++++++-----
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1 file changed, 8 insertions(+), 5 deletions(-)
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diff --git a/libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cc b/libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cc
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index 1a37118c299..066079b3954 100644
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--- a/libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cc
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+++ b/libsanitizer/sanitizer_common/sanitizer_posix_libcdep.cc
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@@ -159,7 +159,11 @@ bool SupportsColoredOutput(fd_t fd) {
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#if !SANITIZER_GO
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// TODO(glider): different tools may require different altstack size.
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-static const uptr kAltStackSize = SIGSTKSZ * 4; // SIGSTKSZ is not enough.
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+static uptr GetAltStackSize() {
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+ // SIGSTKSZ is not enough.
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+ static const uptr kAltStackSize = SIGSTKSZ * 4;
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+ return kAltStackSize;
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+}
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void SetAlternateSignalStack() {
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stack_t altstack, oldstack;
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@@ -170,10 +174,9 @@ void SetAlternateSignalStack() {
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// TODO(glider): the mapped stack should have the MAP_STACK flag in the
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// future. It is not required by man 2 sigaltstack now (they're using
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// malloc()).
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- void* base = MmapOrDie(kAltStackSize, __func__);
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- altstack.ss_sp = (char*) base;
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+ altstack.ss_size = GetAltStackSize();
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+ altstack.ss_sp = (char *)MmapOrDie(altstack.ss_size, __func__);
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altstack.ss_flags = 0;
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- altstack.ss_size = kAltStackSize;
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CHECK_EQ(0, sigaltstack(&altstack, nullptr));
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}
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@@ -181,7 +184,7 @@ void UnsetAlternateSignalStack() {
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stack_t altstack, oldstack;
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altstack.ss_sp = nullptr;
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altstack.ss_flags = SS_DISABLE;
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- altstack.ss_size = kAltStackSize; // Some sane value required on Darwin.
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+ altstack.ss_size = GetAltStackSize(); // Some sane value required on Darwin.
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CHECK_EQ(0, sigaltstack(&altstack, &oldstack));
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UnmapOrDie(oldstack.ss_sp, oldstack.ss_size);
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}
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--
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2.27.0
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