From 27d4450c8f2be71c5d82f0cf6378e39c94153a75 Mon Sep 17 00:00:00 2001 From: Mathieu Desnoyers Date: Fri, 20 Feb 2026 15:06:40 -0500 Subject: [PATCH] rseq: Clarify rseq registration rseq_size bound check comment [ Upstream commit 26d43a90be81fc90e26688a51d3ec83188602731 ] 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: ee3e3ac05c26 ("rseq: Introduce extensible rseq ABI") Signed-off-by: Mathieu Desnoyers Signed-off-by: Peter Zijlstra (Intel) Link: https://patch.msgid.link/20260220200642.1317826-2-mathieu.desnoyers@efficios.com Signed-off-by: Sasha Levin --- kernel/rseq.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/kernel/rseq.c b/kernel/rseq.c index 810005f927d7..e6ee81dd1e45 100644 --- a/kernel/rseq.c +++ b/kernel/rseq.c @@ -432,8 +432,9 @@ SYSCALL_DEFINE4(rseq, struct rseq __user *, rseq, u32, rseq_len, * 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 ||