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| author | Jann Horn <jannh@google.com> | 2024-12-04 17:26:20 +0100 |
|---|---|---|
| committer | Vivek Kasireddy <vivek.kasireddy@intel.com> | 2024-12-12 01:47:40 +0100 |
| commit | 0a16e24e34f28210f68195259456c73462518597 (patch) | |
| tree | 1308ba7c58170240a0965928890c5da399fd1831 /drivers/dma-buf | |
| parent | udmabuf: fix racy memfd sealing check (diff) | |
| download | linux-0a16e24e34f28210f68195259456c73462518597.tar.xz linux-0a16e24e34f28210f68195259456c73462518597.zip | |
udmabuf: also check for F_SEAL_FUTURE_WRITE
When F_SEAL_FUTURE_WRITE was introduced, it was overlooked that udmabuf
must reject memfds with this flag, just like ones with F_SEAL_WRITE.
Fix it by adding F_SEAL_FUTURE_WRITE to SEALS_DENIED.
Fixes: ab3948f58ff8 ("mm/memfd: add an F_SEAL_FUTURE_WRITE seal to memfd")
Cc: stable@vger.kernel.org
Acked-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
Signed-off-by: Jann Horn <jannh@google.com>
Reviewed-by: Joel Fernandes (Google) <joel@joelfernandes.org>
Signed-off-by: Vivek Kasireddy <vivek.kasireddy@intel.com>
Link: https://patchwork.freedesktop.org/patch/msgid/20241204-udmabuf-fixes-v2-2-23887289de1c@google.com
Diffstat (limited to 'drivers/dma-buf')
| -rw-r--r-- | drivers/dma-buf/udmabuf.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/drivers/dma-buf/udmabuf.c b/drivers/dma-buf/udmabuf.c index c1d8c2766d6d..b330b99fcc76 100644 --- a/drivers/dma-buf/udmabuf.c +++ b/drivers/dma-buf/udmabuf.c @@ -297,7 +297,7 @@ static const struct dma_buf_ops udmabuf_ops = { }; #define SEALS_WANTED (F_SEAL_SHRINK) -#define SEALS_DENIED (F_SEAL_WRITE) +#define SEALS_DENIED (F_SEAL_WRITE|F_SEAL_FUTURE_WRITE) static int check_memfd_seals(struct file *memfd) { |