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[bpf-next,v2,01/31] bpf: Use ARG_CONST_SIZE_OR_ZERO for 3rd argument of bpf_tcp_raw_gen_syncookie_ipv{4,6}()

Message ID 20230128000650.1516334-2-iii@linux.ibm.com (mailing list archive)
State Superseded
Commit bf3849755ac606f2a04808b6b706a16867d1e1b8
Delegated to: BPF
Headers show
Series Support bpf trampoline for s390x | expand

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netdev/patch_count fail Series longer than 15 patches (and no cover letter)
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 23 this patch: 23
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Commit Message

Ilya Leoshkevich Jan. 28, 2023, 12:06 a.m. UTC
These functions already check that th_len < sizeof(*th), and
propagating the lower bound (th_len > 0) may be challenging
in complex code, e.g. as is the case with xdp_synproxy test on
s390x [1]. Switch to ARG_CONST_SIZE_OR_ZERO in order to make the
verifier accept code where it cannot prove that th_len > 0.

[1] https://lore.kernel.org/bpf/CAEf4Bzb3uiSHtUbgVWmkWuJ5Sw1UZd4c_iuS4QXtUkXmTTtXuQ@mail.gmail.com/

Signed-off-by: Ilya Leoshkevich <iii@linux.ibm.com>
---
 net/core/filter.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/net/core/filter.c b/net/core/filter.c
index 6da78b3d381e..3ba508a02364 100644
--- a/net/core/filter.c
+++ b/net/core/filter.c
@@ -7532,7 +7532,7 @@  static const struct bpf_func_proto bpf_tcp_raw_gen_syncookie_ipv4_proto = {
 	.arg1_type	= ARG_PTR_TO_FIXED_SIZE_MEM,
 	.arg1_size	= sizeof(struct iphdr),
 	.arg2_type	= ARG_PTR_TO_MEM,
-	.arg3_type	= ARG_CONST_SIZE,
+	.arg3_type	= ARG_CONST_SIZE_OR_ZERO,
 };
 
 BPF_CALL_3(bpf_tcp_raw_gen_syncookie_ipv6, struct ipv6hdr *, iph,
@@ -7564,7 +7564,7 @@  static const struct bpf_func_proto bpf_tcp_raw_gen_syncookie_ipv6_proto = {
 	.arg1_type	= ARG_PTR_TO_FIXED_SIZE_MEM,
 	.arg1_size	= sizeof(struct ipv6hdr),
 	.arg2_type	= ARG_PTR_TO_MEM,
-	.arg3_type	= ARG_CONST_SIZE,
+	.arg3_type	= ARG_CONST_SIZE_OR_ZERO,
 };
 
 BPF_CALL_2(bpf_tcp_raw_check_syncookie_ipv4, struct iphdr *, iph,