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Alex Richardson ad294e572b [sanitizers] Fix interception of GLibc regexec 
Previously, on GLibc systems, the interceptor was calling __compat_regexec
(regexec@GLIBC_2.2.5) insead of the newer __regexec (regexec@GLIBC_2.3.4).
The __compat_regexec strips the REG_STARTEND flag but does not report an
error if other flags are present. This can result in infinite loops for
programs that use REG_STARTEND to find all matches inside a buffer (since
ignoring REG_STARTEND means that the search always starts from the first
character).

The underlying issue is that GLibc's dlsym(RTLD_NEXT, ...) appears to
always return the oldest versioned symbol instead of the default. This
means it does not match the behaviour of dlsym(RTLD_DEFAULT, ...) or the
behaviour documented in the manpage.

It appears a similar issue was encountered with realpath and worked around
in 77ef78a0a5.

See also https://sourceware.org/bugzilla/show_bug.cgi?id=14932 and
https://sourceware.org/bugzilla/show_bug.cgi?id=1319.

Fixes https://github.com/google/sanitizers/issues/1371

Reviewed By: #sanitizers, vitalybuka, marxin

Differential Revision: https://reviews.llvm.org/D96348
 		2021-03-08 10:53:55 +00:00
..
cmake [CMake] Rename RUNTIMES_BUILD to LLVM_RUNTIMES_BUILD 2021-03-03 10:58:51 -08:00
docs
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include [dfsan] Add utils to get and print origin paths and some test cases 2021-03-06 00:11:35 +00:00
lib [sanitizers] Fix interception of GLibc regexec 2021-03-08 10:53:55 +00:00
test [sanitizers] Fix interception of GLibc regexec 2021-03-08 10:53:55 +00:00
tools [GWP-ASan] Add inbuilt options parser. 2021-01-15 12:57:05 -08:00
unittests [Scudo] [GWP-ASan] Add GWP-ASan to Scudo Standalone. 2019-12-13 09:09:41 -08:00
utils [compiler-rt] [netbsd] Update generate_netbsd_syscalls.awk 2020-09-10 20:16:17 +02:00
www [Branch-Rename] Fix some links 2021-02-01 16:43:21 +05:30
.clang-tidy [NFC][compiler-rt] Refine .clang-tidy checks 2020-09-05 15:42:15 -07:00
.gitignore
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CMakeLists.txt [CMake] Rename RUNTIMES_BUILD to LLVM_RUNTIMES_BUILD 2021-03-03 10:58:51 -08:00
CODE_OWNERS.TXT
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CREDITS.TXT
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LICENSE.TXT
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README.txt
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README.txt 

Compiler-RT
================================

This directory and its subdirectories contain source code for the compiler
support routines.

Compiler-RT is open source software. You may freely distribute it under the
terms of the license agreement found in LICENSE.txt.

================================