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Bug 1080077 - For sandbox failures with no crash reporter, log the C stack. r=kang

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This is mostly for ASAN builds, which --disable-crash-reporter, but also
fixes a related papercut: debug builds don't use the crash reporter
unless overridden with an environment variable.

Note: this is Linux-only, so NS_StackWalk is always part of the build;
see also bug 1063455.
This commit is contained in:
Jed Davis 2014-10-13 18:48:17 -07:00
parent e7b6979803
commit 1f08c3f878
1 changed files with 36 additions and 7 deletions
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43
security/sandbox/linux/glue/SandboxCrash.cpp
View File

@ -19,12 +19,12 @@
#include "mozilla/unused.h"
#include "mozilla/dom/Exceptions.h"
#include "nsContentUtils.h"
#include "nsString.h"
#include "nsThreadUtils.h"
#ifdef MOZ_CRASHREPORTER
#include "nsExceptionHandler.h"
#endif
#include "nsStackWalk.h"
#include "nsString.h"
#include "nsThreadUtils.h"
namespace mozilla {
@ -74,17 +74,46 @@ SandboxLogJSStack(void)
}
}
static void SandboxPrintStackFrame(uint32_t aFrameNumber, void *aPC, void *aSP,
void *aClosure)
{
char buf[1024];
nsCodeAddressDetails details;
NS_DescribeCodeAddress(aPC, &details);
NS_FormatCodeAddressDetails(buf, sizeof(buf), aFrameNumber, aPC, &details);
SANDBOX_LOG_ERROR("frame %s", buf);
}
static void
SandboxLogCStack()
{
// Skip 3 frames: one for this module, one for the signal handler in
// libmozsandbox, and one for the signal trampoline.
//
// Warning: this might not print any stack frames. NS_StackWalk
// can't walk past the signal trampoline on ARM (bug 968531), and
// x86 frame pointer walking may or may not work (bug 1082276).
NS_StackWalk(SandboxPrintStackFrame, /* skip */ 3, /* max */ 0,
nullptr, 0, nullptr);
SANDBOX_LOG_ERROR("end of stack.");
}
static void
SandboxCrash(int nr, siginfo_t *info, void *void_context)
{
pid_t pid = getpid(), tid = syscall(__NR_gettid);
bool dumped = false;
#ifdef MOZ_CRASHREPORTER
bool dumped = CrashReporter::WriteMinidumpForSigInfo(nr, info, void_context);
if (!dumped) {
SANDBOX_LOG_ERROR("Failed to write minidump");
}
dumped = CrashReporter::WriteMinidumpForSigInfo(nr, info, void_context);
#endif
if (!dumped) {
SANDBOX_LOG_ERROR("crash reporter is disabled (or failed);"
" trying stack trace:");
SandboxLogCStack();
}
// Do this last, in case it crashes or deadlocks.
SandboxLogJSStack();