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Dan Liew 7039773b24 Unbreak ASan runtime in the simulators. 
Summary:
861b69faee (rdar://problem/58789439) while
fixing symbolization for TSan completely broke ASan's runtime for the
simulators.

The problem with the previous patch is that the memory passed to
`putenv()` was poisoned and when passed to `putenv()` it tripped
an interceptor for `strchr()` which saw the memory was poisoned and
raised an ASan issue.

The memory was poisoned because `AtosSymbolizerProcess` objects
are created using ASan's internal allocator. Memory from this
allocator gets poisoned with `kAsanInternalHeapMagic`.

To workaround this, this patch makes the memory for the environment
variable entry a global variable that isn't poisoned.

This pass also adds a `DCHECK(getenv(K_ATOS_ENV_VAR))` because the
following DCHECK would crash because `internal_strcmp()` doesn't
work on nullptr.

rdar://problem/62067724

Reviewers: kubamracek, yln

Subscribers: #sanitizers, llvm-commits

Tags: #sanitizers

Differential Revision: https://reviews.llvm.org/D78525
 		2020-04-20 19:08:08 -07:00
..
cmake [MSan] Enable for SystemZ 2020-04-16 12:15:01 +02:00
docs
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include [compiler-rt] Mark FDP non-template methods inline to avoid ODR violations. 2020-03-25 13:43:54 -07:00
lib Unbreak ASan runtime in the simulators. 2020-04-20 19:08:08 -07:00
test [dfsan] Fix a bug in strcasecmp() and strncasecmp(): Compare the lowercase versions of the characters when choosing a return value. 2020-04-20 17:13:40 -07:00
tools Add GWP-ASan fuzz target to compiler-rt/tools. 2019-08-27 18:28:07 +00:00
unittests [Scudo] [GWP-ASan] Add GWP-ASan to Scudo Standalone. 2019-12-13 09:09:41 -08:00
utils [compiler-rt] Fix build on NetBSD 9.99.44 2020-01-31 14:57:20 +01:00
www [www] Change URLs to HTTPS. 2019-10-24 13:25:15 -07:00
.gitignore
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CMakeLists.txt Reland "Make llvm_source_root in llvm-lit relative too." 2020-04-06 20:49:10 -04:00
CODE_OWNERS.TXT
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CREDITS.TXT
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LICENSE.TXT Fix typos throughout the license files that somehow I and my reviewers 2019-01-21 09:52:34 +00:00
README.txt
…

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.

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