From 5aac2726b6930f9d5dffb1090ebfc0cdfad6a30c Mon Sep 17 00:00:00 2001 From: Aleksa Sarai Date: Sat, 12 Aug 2023 07:16:11 -0600 Subject: [PATCH] io_uring: correct check for O_TMPFILE Commit 72dbde0f2afbe4af8e8595a89c650ae6b9d9c36f upstream. O_TMPFILE is actually __O_TMPFILE|O_DIRECTORY. This means that the old check for whether RESOLVE_CACHED can be used would incorrectly think that O_DIRECTORY could not be used with RESOLVE_CACHED. Cc: stable@vger.kernel.org # v5.12+ Fixes: 3a81fd02045c ("io_uring: enable LOOKUP_CACHED path resolution for filename lookups") Signed-off-by: Aleksa Sarai Link: https://lore.kernel.org/r/20230807-resolve_cached-o_tmpfile-v3-1-e49323e1ef6f@cyphar.com Signed-off-by: Jens Axboe Signed-off-by: Greg Kroah-Hartman --- io_uring/openclose.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/io_uring/openclose.c b/io_uring/openclose.c index 67178e4bb282..008990e58180 100644 --- a/io_uring/openclose.c +++ b/io_uring/openclose.c @@ -110,9 +110,11 @@ int io_openat2(struct io_kiocb *req, unsigned int issue_flags) if (issue_flags & IO_URING_F_NONBLOCK) { /* * Don't bother trying for O_TRUNC, O_CREAT, or O_TMPFILE open, - * it'll always -EAGAIN + * it'll always -EAGAIN. Note that we test for __O_TMPFILE + * because O_TMPFILE includes O_DIRECTORY, which isn't a flag + * we need to force async for. */ - if (open->how.flags & (O_TRUNC | O_CREAT | O_TMPFILE)) + if (open->how.flags & (O_TRUNC | O_CREAT | __O_TMPFILE)) return -EAGAIN; op.lookup_flags |= LOOKUP_CACHED; op.open_flag |= O_NONBLOCK;