bpf: Enable unaligned accesses for syscall ctx

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>
Link: https://lore.kernel.org/r/20260406194403.1649608-3-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>

diff --git a/kernel/bpf/syscall.c b/kernel/bpf/syscall.c
index 810991709da77d03ea50fdc80aaa1ecded5d0a31..f1044ab9b03be33195c52a7dc76a5ce3de7da22a 100644 (file)
--- 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;
 }