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| author | Xuan Zhuo <xuanzhuo@linux.alibaba.com> | 2021-04-28 17:44:24 +0800 |
|---|---|---|
| committer | Daniel Borkmann <daniel@iogearbox.net> | 2021-05-04 00:28:06 +0200 |
| commit | ac31565c21937eee9117e43c9cd34f557f6f1cb8 (patch) | |
| tree | 8359163fe639b92bb0dfcedc3530450c765ed386 /net | |
| parent | 2a30f9440640c418bcfbea9b2b344d268b58e0a2 (diff) | |
| download | linux-ac31565c21937eee9117e43c9cd34f557f6f1cb8.tar.gz linux-ac31565c21937eee9117e43c9cd34f557f6f1cb8.tar.bz2 linux-ac31565c21937eee9117e43c9cd34f557f6f1cb8.zip | |
xsk: Fix for xp_aligned_validate_desc() when len == chunk_size
When desc->len is equal to chunk_size, it is legal. But when the
xp_aligned_validate_desc() got chunk_end from desc->addr + desc->len
pointing to the next chunk during the check, it caused the check to
fail.
This problem was first introduced in bbff2f321a86 ("xsk: new descriptor
addressing scheme"). Later in 2b43470add8c ("xsk: Introduce AF_XDP buffer
allocation API") this piece of code was moved into the new function called
xp_aligned_validate_desc(). This function was then moved into xsk_queue.h
via 26062b185eee ("xsk: Explicitly inline functions and move definitions").
Fixes: bbff2f321a86 ("xsk: new descriptor addressing scheme")
Signed-off-by: Xuan Zhuo <xuanzhuo@linux.alibaba.com>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Magnus Karlsson <magnus.karlsson@intel.com>
Link: https://lore.kernel.org/bpf/20210428094424.54435-1-xuanzhuo@linux.alibaba.com
Diffstat (limited to 'net')
| -rw-r--r-- | net/xdp/xsk_queue.h | 7 |
1 files changed, 3 insertions, 4 deletions
diff --git a/net/xdp/xsk_queue.h b/net/xdp/xsk_queue.h index 2ac3802c2cd7..9d2a89d793c0 100644 --- a/net/xdp/xsk_queue.h +++ b/net/xdp/xsk_queue.h @@ -128,13 +128,12 @@ static inline bool xskq_cons_read_addr_unchecked(struct xsk_queue *q, u64 *addr) static inline bool xp_aligned_validate_desc(struct xsk_buff_pool *pool, struct xdp_desc *desc) { - u64 chunk, chunk_end; + u64 chunk; - chunk = xp_aligned_extract_addr(pool, desc->addr); - chunk_end = xp_aligned_extract_addr(pool, desc->addr + desc->len); - if (chunk != chunk_end) + if (desc->len > pool->chunk_size) return false; + chunk = xp_aligned_extract_addr(pool, desc->addr); if (chunk >= pool->addrs_cnt) return false; |