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7 Commits

Author SHA1 Message Date
Matt Morehouse 034126e507 [SanitizeCoverage] Enable stack-depth coverage for -fsanitize=fuzzer 
Summary:
- Don't sanitize __sancov_lowest_stack.
- Don't instrument leaf functions.
- Add CoverageStackDepth to Fuzzer and FuzzerNoLink.
- Only enable on Linux.

Reviewers: vitalybuka, kcc, george.karpenkov

Reviewed By: kcc

Subscribers: kubamracek, cfe-commits, llvm-commits, hiraditya

Differential Revision: https://reviews.llvm.org/D37156

llvm-svn: 312185
 2017-08-30 22:49:31 +00:00
Matt Morehouse ba2e61b357 Revert "[SanitizeCoverage] Enable stack-depth coverage for -fsanitize=fuzzer" 
This reverts r312026 due to bot breakage.

llvm-svn: 312047
 2017-08-29 21:56:56 +00:00
Matt Morehouse 2ad8d948b2 [SanitizeCoverage] Enable stack-depth coverage for -fsanitize=fuzzer 
Summary:
- Don't sanitize __sancov_lowest_stack.
- Don't instrument leaf functions.
- Add CoverageStackDepth to Fuzzer and FuzzerNoLink.
- Disable stack depth tracking on Mac.

Reviewers: vitalybuka, kcc, george.karpenkov

Reviewed By: kcc

Subscribers: kubamracek, cfe-commits, llvm-commits, hiraditya

Differential Revision: https://reviews.llvm.org/D37156

llvm-svn: 312026
 2017-08-29 19:48:12 +00:00
Matt Morehouse 6ec7595b1e Revert "[SanitizeCoverage] Enable stack-depth coverage for -fsanitize=fuzzer" 
This reverts r311801 due to a bot failure.

llvm-svn: 311803
 2017-08-25 22:01:21 +00:00
Matt Morehouse f42bd31323 [SanitizeCoverage] Enable stack-depth coverage for -fsanitize=fuzzer 
Summary:
- Don't sanitize __sancov_lowest_stack.
- Don't instrument leaf functions.
- Add CoverageStackDepth to Fuzzer and FuzzerNoLink.

Reviewers: vitalybuka, kcc

Reviewed By: kcc

Subscribers: cfe-commits, llvm-commits, hiraditya

Differential Revision: https://reviews.llvm.org/D37156

llvm-svn: 311801
 2017-08-25 21:18:29 +00:00
Matt Morehouse b1fa8255db [SanitizerCoverage] Optimize stack-depth instrumentation. 
Summary:
Use the initialexec TLS type and eliminate calls to the TLS
wrapper.  Fixes the sanitizer-x86_64-linux-fuzzer bot failure.

Reviewers: vitalybuka, kcc

Reviewed By: kcc

Subscribers: hiraditya, llvm-commits

Differential Revision: https://reviews.llvm.org/D37026

llvm-svn: 311490
 2017-08-22 21:28:29 +00:00
Matt Morehouse 5c7fc76983 [SanitizerCoverage] Add stack depth tracing instrumentation. 
Summary:
Augment SanitizerCoverage to insert maximum stack depth tracing for
use by libFuzzer.  The new instrumentation is enabled by the flag
-fsanitize-coverage=stack-depth and is compatible with the existing
trace-pc-guard coverage.  The user must also declare the following
global variable in their code:
  thread_local uintptr_t __sancov_lowest_stack

https://bugs.llvm.org/show_bug.cgi?id=33857

Reviewers: vitalybuka, kcc

Reviewed By: vitalybuka

Subscribers: kubamracek, hiraditya, cfe-commits, llvm-commits

Differential Revision: https://reviews.llvm.org/D36839

llvm-svn: 311186
 2017-08-18 18:43:30 +00:00