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selftests/rseq: check if libc rseq support is registered

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When checking for libc rseq support in the library constructor, don't
only depend on the symbols presence, check that the registration was
completed.

This targets a scenario where the libc has rseq support but it is not
wired for the current architecture in 'bits/rseq.h', we want to fallback
to our internal registration mechanism.

Signed-off-by: Michael Jeanson <mjeanson@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://lore.kernel.org/r/20220614154830.1367382-4-mjeanson@efficios.com
This commit is contained in:
Michael Jeanson
2022-06-14 11:48:30 -04:00
committed by Peter Zijlstra
parent d47c0cc94a
commit d1a997ba4c
1 changed files with 2 additions and 1 deletions
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3
tools/testing/selftests/rseq/rseq.c
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@@ -111,7 +111,8 @@ void rseq_init(void)
libc_rseq_offset_p = dlsym(RTLD_NEXT, "__rseq_offset");
libc_rseq_size_p = dlsym(RTLD_NEXT, "__rseq_size");
libc_rseq_flags_p = dlsym(RTLD_NEXT, "__rseq_flags");
if (libc_rseq_size_p && libc_rseq_offset_p && libc_rseq_flags_p) {
if (libc_rseq_size_p && libc_rseq_offset_p && libc_rseq_flags_p &&
*libc_rseq_size_p != 0) {
/* rseq registration owned by glibc */
rseq_offset = *libc_rseq_offset_p;
rseq_size = *libc_rseq_size_p;