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From: Kumar Kartikeya Dwivedi <memxor@gmail.com>
To: bpf@vger.kernel.org
Cc: Emil Tsalapatis <emil@etsalapatis.com>,
	Alexei Starovoitov <ast@kernel.org>,
	Andrii Nakryiko <andrii@kernel.org>,
	Daniel Borkmann <daniel@iogearbox.net>,
	Martin KaFai Lau <martin.lau@kernel.org>,
	Eduard Zingerman <eddyz87@gmail.com>, Tejun Heo <tj@kernel.org>,
	Dan Schatzberg <dschatzberg@meta.com>,
	kkd@meta.com, kernel-team@meta.com
Subject: [PATCH bpf-next v5 2/7] bpf: Enable unaligned accesses for syscall ctx
Date: Mon,  6 Apr 2026 21:43:56 +0200	[thread overview]
Message-ID: <20260406194403.1649608-3-memxor@gmail.com> (raw)
In-Reply-To: <20260406194403.1649608-1-memxor@gmail.com>

Don't reject usage of fixed unaligned offsets for syscall ctx. Tests
will be added in later commits. Unaligned offsets already work for
variable offsets.

Reviewed-by: Emil Tsalapatis <emil@etsalapatis.com>
Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
 kernel/bpf/syscall.c | 3 +--
 1 file changed, 1 insertion(+), 2 deletions(-)

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 810991709da7..f1044ab9b03b 100644
--- a/kernel/bpf/syscall.c
+++ b/kernel/bpf/syscall.c
@@ -6386,8 +6386,7 @@ static bool syscall_prog_is_valid_access(int off, int size,
 {
 	if (off < 0 || off >= U16_MAX)
 		return false;
-	if (off % size != 0)
-		return false;
+	/* No alignment requirements for syscall ctx accesses. */
 	return true;
 }
 
-- 
2.52.0


  parent reply	other threads:[~2026-04-06 19:44 UTC|newest]

Thread overview: 10+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2026-04-06 19:43 [PATCH bpf-next v5 0/7] Allow variable offsets for syscall PTR_TO_CTX Kumar Kartikeya Dwivedi
2026-04-06 19:43 ` [PATCH bpf-next v5 1/7] bpf: Support " Kumar Kartikeya Dwivedi
2026-04-06 19:43 ` Kumar Kartikeya Dwivedi [this message]
2026-04-06 19:43 ` [PATCH bpf-next v5 3/7] selftests/bpf: Convert ctx tests from ASM to C Kumar Kartikeya Dwivedi
2026-04-06 19:43 ` [PATCH bpf-next v5 4/7] selftests/bpf: Add syscall ctx variable offset tests Kumar Kartikeya Dwivedi
2026-04-06 19:43 ` [PATCH bpf-next v5 5/7] selftests/bpf: Test modified syscall ctx for ARG_PTR_TO_CTX Kumar Kartikeya Dwivedi
2026-04-06 19:44 ` [PATCH bpf-next v5 6/7] selftests/bpf: Add tests for unaligned syscall ctx accesses Kumar Kartikeya Dwivedi
2026-04-06 19:44 ` [PATCH bpf-next v5 7/7] selftests/bpf: Add tests for syscall ctx accesses beyond U16_MAX Kumar Kartikeya Dwivedi
2026-04-06 22:02   ` Alexei Starovoitov
2026-04-06 22:30 ` [PATCH bpf-next v5 0/7] Allow variable offsets for syscall PTR_TO_CTX patchwork-bot+netdevbpf

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