Differential D33933

sanitizers: Improve FreeBSD ASLR detection
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Authored by emaste on Jan 18 2022, 10:11 PM.

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rGbf1a58efa081: sanitizers: Improve FreeBSD ASLR detection
rGfd1501dcf0e8: sanitizers: Improve FreeBSD ASLR detection
rG7cafe89f9ce3: sanitizers: Improve FreeBSD ASLR detection

Summary

The kern.elf64.aslr.pie_enable and kern.elf32.aslr.pie_enable sysctls control the default setting for PIE binary address randomization, but it is possible to enable or disable ASLR on a per-process basis. Use procctl(2) to query whether ASLR is enabled.

(Note that with ASLR enabled but sysctl kern.elf64.aslr.pie_enable=0 a PIE binary will in effect have randomization disabled, and be functional with msan. This is not intended as as a user-facing control though. The user can use proccontrol(1) to disable aslr for the process.)

From LLVM 64de0064f315f57044294879d9ff4eacb454d45b

(review for approval to merge to in-tree copy of contrib/llvm-project)

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rG FreeBSD src repository

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Event Timeline

emaste requested review of this revision.Jan 18 2022, 10:11 PM

emaste created this revision.

emaste added a child revision: D33934: compiler-rt: re-exec with ASLR disabled when necessary.Jan 18 2022, 10:38 PM

LGTM

This revision is now accepted and ready to land.Jan 19 2022, 5:52 PM

Closed by commit rG7cafe89f9ce3: sanitizers: Improve FreeBSD ASLR detection (authored by emaste). · Explain WhyJan 19 2022, 6:08 PM

This revision was automatically updated to reflect the committed changes.

emaste added a commit: rG7cafe89f9ce3: sanitizers: Improve FreeBSD ASLR detection.

Herald added a subscriber: imp. · View Herald TranscriptJan 19 2022, 6:08 PM

emaste added a commit: rGfd1501dcf0e8: sanitizers: Improve FreeBSD ASLR detection.Feb 2 2022, 1:15 AM

emaste added a commit: rGbf1a58efa081: sanitizers: Improve FreeBSD ASLR detection.Feb 2 2022, 1:18 AM

Revision Contents
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Size

contrib/

llvm-project/

compiler-rt/

lib/

sanitizer_common/

sanitizer_linux.cpp

25 lines

Diff 101647

contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp

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