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userfaultfd: open userfaultfds with O_RDONLY

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[ Upstream commit abec3d015f ]

Since userfaultfd doesn't implement a write operation, it is more
appropriate to open it read-only.

When userfaultfds are opened read-write like it is now, and such fd is
passed from one process to another, SELinux will check both read and
write permissions for the target process, even though it can't actually
do any write operation on the fd later.

Inspired by the following bug report, which has hit the SELinux scenario
described above:
https://bugzilla.redhat.com/show_bug.cgi?id=1974559

Reported-by: Robert O'Callahan <roc@ocallahan.org>
Fixes: 86039bd3b4 ("userfaultfd: add new syscall to provide memory externalization")
Signed-off-by: Ondrej Mosnacek <omosnace@redhat.com>
Acked-by: Peter Xu <peterx@redhat.com>
Acked-by: Christian Brauner (Microsoft) <brauner@kernel.org>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
This commit is contained in:
Ondrej Mosnacek 2022-07-08 11:34:51 +02:00 committed by Greg Kroah-Hartman
parent 10918ebecd
commit 33d478eee2
1 changed files with 2 additions and 2 deletions
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4
fs/userfaultfd.c
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@ -982,7 +982,7 @@ static int resolve_userfault_fork(struct userfaultfd_ctx *new,
int fd;
fd = anon_inode_getfd_secure("[userfaultfd]", &userfaultfd_fops, new,
O_RDWR | (new->flags & UFFD_SHARED_FCNTL_FLAGS), inode);
O_RDONLY | (new->flags & UFFD_SHARED_FCNTL_FLAGS), inode);
if (fd < 0)
return fd;
@ -2097,7 +2097,7 @@ SYSCALL_DEFINE1(userfaultfd, int, flags)
mmgrab(ctx->mm);
fd = anon_inode_getfd_secure("[userfaultfd]", &userfaultfd_fops, ctx,
O_RDWR | (flags & UFFD_SHARED_FCNTL_FLAGS), NULL);
O_RDONLY | (flags & UFFD_SHARED_FCNTL_FLAGS), NULL);
if (fd < 0) {
mmdrop(ctx->mm);
kmem_cache_free(userfaultfd_ctx_cachep, ctx);