Unexpected struct initialiser in RELRO section #673
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stephensmalley
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May 30, 2024
CHERI/Morello Clang needlessly places data in the RELRO section in the presence of capabilities. No such section is expected in linker scripts, causing issues at link-time and/or runtime. While waiting for Clang to become more conservative about its use of RELRO data, work around the issue by placing .data.rel.ro together with .rodata, which is appropriate for the kernel. CHERI-LLVM issue: CTSRD-CHERI/llvm-project#673 Signed-off-by: Kevin Brodsky <[email protected]>
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It seems that Clang will always put a struct initialiser in
.data.rel.roif the struct contains capabilities, even though they are zero-initialised. Reduced case from the Linux kernel: https://cheri-compiler-explorer.cl.cam.ac.uk/z/Pnn9fE. This seems to be target-independent, the same occurs with Morello Clang.While this is simply unnecessary for standard dynamic binaries, for the Linux kernel this is a more serious issue as no RELRO section is expected (and the linker script asserts that there is none).
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