72 lines
3.2 KiB
Diff
72 lines
3.2 KiB
Diff
From ffd0f69c375f12f081a1a5158a02a05000b7a93c Mon Sep 17 00:00:00 2001
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From: Vitaly Buka <vitalybuka@google.com>
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Date: Fri, 16 Apr 2021 09:50:24 -0700
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Subject: [PATCH][compiler-rt] Sanitizer built against glibc 2.34 doesn't work
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As mentioned in https://gcc.gnu.org/PR100114 , glibc starting with the
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https://sourceware.org/git/?p=glibc.git;a=commit;h=6c57d320484988e87e446e2e60ce42816bf51d53
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change doesn't define SIGSTKSZ and MINSIGSTKSZ macros to constants, but to sysconf function call.
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sanitizer_posix_libcdep.cpp has
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static const uptr kAltStackSize = SIGSTKSZ * 4; // SIGSTKSZ is not enough.
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which is generally fine, just means that when SIGSTKSZ is not a compile time constant will be initialized later.
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The problem is that kAltStackSize is used in SetAlternateSignalStack which is called very early, from .preinit_array
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initialization, i.e. far before file scope variables are constructed, which means it is not initialized and
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mmapping 0 will fail:
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==145==ERROR: AddressSanitizer failed to allocate 0x0 (0) bytes of SetAlternateSignalStack (error code: 22)
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Here is one possible fix, another one could be to make kAltStackSize a preprocessor macro if _SG_SIGSTKSZ is defined
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(but perhaps with having an automatic const variable initialized to it so that sysconf isn't at least called twice
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during SetAlternateSignalStack.
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Reviewed By: vitalybuka
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Differential Revision: https://reviews.llvm.org/D100645
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(cherry picked from commit 82150606fb11d28813ae6da1101f5bda638165fe)
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---
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compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp | 12 ++++++++----
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1 file changed, 8 insertions(+), 4 deletions(-)
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diff --git a/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp b/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp
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index d29438c..2b10bdd 100644
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--- a/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp
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+++ b/compiler-rt/lib/sanitizer_common/sanitizer_posix_libcdep.cpp
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@@ -165,7 +165,11 @@ 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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@@ -176,10 +180,10 @@ 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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+ void *base = MmapOrDie(GetAltStackSize(), __func__);
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altstack.ss_sp = (char*) base;
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altstack.ss_flags = 0;
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- altstack.ss_size = kAltStackSize;
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+ altstack.ss_size = GetAltStackSize();
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CHECK_EQ(0, sigaltstack(&altstack, nullptr));
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}
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@@ -187,7 +191,7 @@ 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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1.8.3.1
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