5.15-stable review patch. If anyone has any objections, please let me know.
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From: Aleksa Sarai cyphar@cyphar.com
commit f92f0a1b05698340836229d791b3ffecc71b265a upstream.
While we do currently return -EFAULT in this case, it seems prudent to follow the behaviour of other syscalls like clone3. It seems quite unlikely that anyone depends on this error code being EFAULT, but we can always revert this if it turns out to be an issue.
Cc: stable@vger.kernel.org # v5.6+ Fixes: fddb5d430ad9 ("open: introduce openat2(2) syscall") Signed-off-by: Aleksa Sarai cyphar@cyphar.com Link: https://lore.kernel.org/r/20241010-extensible-structs-check_fields-v3-3-d283... Signed-off-by: Christian Brauner brauner@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/open.c | 2 ++ 1 file changed, 2 insertions(+)
--- a/fs/open.c +++ b/fs/open.c @@ -1296,6 +1296,8 @@ SYSCALL_DEFINE4(openat2, int, dfd, const
if (unlikely(usize < OPEN_HOW_SIZE_VER0)) return -EINVAL; + if (unlikely(usize > PAGE_SIZE)) + return -E2BIG;
err = copy_struct_from_user(&tmp, sizeof(tmp), how, usize); if (err)