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compiler-rt: re-exec with ASLR disabled when necessary

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Some sanitizers (at least msan) currently require ASLR to be disabled.
When we detect that ASLR is enabled, re-exec with it disabled rather
than exiting with an error.  See LLVM GitHub issue 53256 for more
detail: https://github.com/llvm/llvm-project/issues/53256

No objection:	dim
MFC after:	2 weeks
Sponsored by:	The FreeBSD Foundation
Differential Revision:	https://reviews.freebsd.org/D33934
This commit is contained in:
Ed Maste 2022-01-16 14:22:05 -05:00
parent 96fe7c8ab0
commit 930a7c2ac6
1 changed files with 5 additions and 2 deletions
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7
contrib/llvm-project/compiler-rt/lib/sanitizer_common/sanitizer_linux.cpp
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@ -2197,8 +2197,11 @@ void CheckASLR() {
} }
if ((aslr_status & PROC_ASLR_ACTIVE) != 0) { if ((aslr_status & PROC_ASLR_ACTIVE) != 0) {
Printf("This sanitizer is not compatible with enabled ASLR " Printf("This sanitizer is not compatible with enabled ASLR "
"and binaries compiled with PIE\n"); "and binaries compiled with PIE\n"
Die(); "ASLR will be disabled and the program re-executed.\n");
int aslr_ctl = PROC_ASLR_FORCE_DISABLE;
CHECK_NE(procctl(P_PID, 0, PROC_ASLR_CTL, &aslr_ctl), -1);
ReExec();
} }
#else #else
// Do nothing // Do nothing