[all-commits] [llvm/llvm-project] 8434e5: [dfsan] Don't clear shadow on dlopen(NULL, flags)
Fangrui Song via All-commits
all-commits at lists.llvm.org
Thu Jan 18 15:05:00 PST 2024
Branch: refs/heads/main
Home: https://github.com/llvm/llvm-project
Commit: 8434e5d0a16b11ccdc29fc66a3843a94b0ad19f1
https://github.com/llvm/llvm-project/commit/8434e5d0a16b11ccdc29fc66a3843a94b0ad19f1
Author: Fangrui Song <i at maskray.me>
Date: 2024-01-18 (Thu, 18 Jan 2024)
Changed paths:
M compiler-rt/lib/dfsan/dfsan_custom.cpp
M compiler-rt/test/dfsan/custom.cpp
Log Message:
-----------
[dfsan] Don't clear shadow on dlopen(NULL, flags)
This ports msan https://reviews.llvm.org/D14795 to dfsan.
dfsan, like msan, clears shadow for globals in a newly opened DSO in
case the DSO occupies the address of a previously labeled/poisoned area.
The operation should not happen on the main executable.
In addition, for a DT_EXEC executable, l_addr is zero and will lead to a
null pointer dereference in ForEachMappedRegion.
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