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rseq: Clarify rseq registration rseq_size bound check comment

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The rseq registration validates that the rseq_size argument is greater
or equal to 32 (the original rseq size), but the comment associated with
this check does not clearly state this.

Clarify the comment to that effect.

Fixes: ee3e3ac05c ("rseq: Introduce extensible rseq ABI")
Signed-off-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Link: https://patch.msgid.link/20260220200642.1317826-2-mathieu.desnoyers@efficios.com
This commit is contained in:
Mathieu Desnoyers
2026-02-20 15:06:40 -05:00
committed by Peter Zijlstra
parent 5324953c06
commit 26d43a90be
1 changed files with 3 additions and 2 deletions
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5
kernel/rseq.c
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@@ -449,8 +449,9 @@ SYSCALL_DEFINE4(rseq, struct rseq __user *, rseq, u32, rseq_len, int, flags, u32
* auxiliary vector AT_RSEQ_ALIGN. If rseq_len is the original rseq
* size, the required alignment is the original struct rseq alignment.
*
* In order to be valid, rseq_len is either the original rseq size, or
* large enough to contain all supported fields, as communicated to
* The rseq_len is required to be greater or equal to the original rseq
* size. In order to be valid, rseq_len is either the original rseq size,
* or large enough to contain all supported fields, as communicated to
* user-space through the ELF auxiliary vector AT_RSEQ_FEATURE_SIZE.
*/
if (rseq_len < ORIG_RSEQ_SIZE ||