diff mbox series

[bpf,v2,4/4] libbpf: Check the validity of size in user_ring_buffer__reserve()

Message ID 20221116072351.1168938-5-houtao@huaweicloud.com (mailing list archive)
State Accepted
Commit 05c1558bfcb63b95a9f530767c04c7db091560f2
Delegated to: BPF
Headers show
Series libbpf: Fixes for ring buffer | expand

Checks

Context Check Description
netdev/tree_selection success Clearly marked for bpf
netdev/fixes_present success Fixes tag present in non-next series
netdev/subject_prefix success Link
netdev/cover_letter success Series has a cover letter
netdev/patch_count success Link
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers success CCed 12 of 12 maintainers
netdev/build_clang success Errors and warnings before: 0 this patch: 0
netdev/module_param success Was 0 now: 0
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 0 this patch: 0
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 10 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
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bpf/vmtest-bpf-PR success PR summary

Commit Message

Hou Tao Nov. 16, 2022, 7:23 a.m. UTC 
From: Hou Tao <houtao1@huawei.com>

The top two bits of size are used as busy and discard flags, so reject
the reservation that has any of these special bits in the size. With the
addition of validity check, these is also no need to check whether or
not total_size is overflowed.

Signed-off-by: Hou Tao <houtao1@huawei.com>
---
 tools/lib/bpf/ringbuf.c | 4 ++++
 1 file changed, 4 insertions(+)
diff mbox series

Patch

diff --git a/tools/lib/bpf/ringbuf.c b/tools/lib/bpf/ringbuf.c
index 277e49137a95..3b65f04ec46e 100644
--- a/tools/lib/bpf/ringbuf.c
+++ b/tools/lib/bpf/ringbuf.c
@@ -490,6 +490,10 @@  void *user_ring_buffer__reserve(struct user_ring_buffer *rb, __u32 size)
 	__u64 cons_pos, prod_pos;
 	struct ringbuf_hdr *hdr;
 
+	/* The top two bits are used as special flags */
+	if (size & (BPF_RINGBUF_BUSY_BIT | BPF_RINGBUF_DISCARD_BIT))
+		return errno = E2BIG, NULL;
+
 	/* Synchronizes with smp_store_release() in __bpf_user_ringbuf_peek() in
 	 * the kernel.
 	 */