[llvm] e9b394b - [JITLink][ELF] Only make sections with SHF_WRITE writable
Job Noorman via llvm-commits
llvm-commits at lists.llvm.org
Mon Apr 3 11:19:08 PDT 2023
Author: Job Noorman
Date: 2023-04-03T20:18:27+02:00
New Revision: e9b394b08eb6db5aa225441cf3fb9d4380ff4533
URL: https://github.com/llvm/llvm-project/commit/e9b394b08eb6db5aa225441cf3fb9d4380ff4533
DIFF: https://github.com/llvm/llvm-project/commit/e9b394b08eb6db5aa225441cf3fb9d4380ff4533.diff
LOG: [JITLink][ELF] Only make sections with SHF_WRITE writable
All non-executable sections used to be mapped as RW- causing read-only
sections such as .rodata to be writable.
Reviewed By: lhames
Differential Revision: https://reviews.llvm.org/D147442
Added:
Modified:
llvm/lib/ExecutionEngine/JITLink/ELFLinkGraphBuilder.h
Removed:
################################################################################
diff --git a/llvm/lib/ExecutionEngine/JITLink/ELFLinkGraphBuilder.h b/llvm/lib/ExecutionEngine/JITLink/ELFLinkGraphBuilder.h
index 1d98acf868695..c1f69d0bf5698 100644
--- a/llvm/lib/ExecutionEngine/JITLink/ELFLinkGraphBuilder.h
+++ b/llvm/lib/ExecutionEngine/JITLink/ELFLinkGraphBuilder.h
@@ -360,11 +360,11 @@ template <typename ELFT> Error ELFLinkGraphBuilder<ELFT>::graphifySections() {
});
// Get the section's memory protection flags.
- orc::MemProt Prot;
+ orc::MemProt Prot = orc::MemProt::Read;
if (Sec.sh_flags & ELF::SHF_EXECINSTR)
- Prot = orc::MemProt::Read | orc::MemProt::Exec;
- else
- Prot = orc::MemProt::Read | orc::MemProt::Write;
+ Prot |= orc::MemProt::Exec;
+ if (Sec.sh_flags & ELF::SHF_WRITE)
+ Prot |= orc::MemProt::Write;
// Look for existing sections first.
auto *GraphSec = G->findSectionByName(*Name);
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