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openat2: explicitly return -E2BIG for (usize > PAGE_SIZE) 

commit f92f0a1b05 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: fddb5d430a ("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-d2833dfe6edd@cyphar.com
Signed-off-by: Christian Brauner <brauner@kernel.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Aleksa Sarai 2024-10-10 07:40:36 +11:00 committed by WangYuli
parent 0d796f99d7
commit 9675ac22e7
1 changed files with 2 additions and 0 deletions
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2
fs/open.c
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@ -1461,6 +1461,8 @@ SYSCALL_DEFINE4(openat2, int, dfd, const char __user *, filename,
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)