github-mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2026-05-30 01:53:29 +02:00
Code Issues Actions Packages Projects Releases Wiki Activity Graph

selftests/bpf: Test changing packet data from kfunc

Browse Source 
bpf_xdp_pull_data() is the first kfunc that changes packet data. Make
sure the verifier clear all packet pointers after calling packet data
changing kfunc.

Signed-off-by: Amery Hung <ameryhung@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/20250926164142.1850176-1-ameryhung@gmail.com
This commit is contained in:
Amery Hung 2025-09-26 09:41:42 -07:00 committed by Martin KaFai Lau
parent d43029ff7d
commit 991e555eff
1 changed files with 14 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

14
tools/testing/selftests/bpf/progs/verifier_sock.c
View File

@ -1096,6 +1096,20 @@ int invalidate_xdp_pkt_pointers_from_global_func(struct xdp_md *x)
return XDP_PASS;
}
/* XDP packet changing kfunc calls invalidate packet pointers */
SEC("xdp")
__failure __msg("invalid mem access")
int invalidate_xdp_pkt_pointers(struct xdp_md *x)
{
int *p = (void *)(long)x->data;
if ((void *)(p + 1) > (void *)(long)x->data_end)
return XDP_DROP;
bpf_xdp_pull_data(x, 0);
*p = 42; /* this is unsafe */
return XDP_PASS;
}
__noinline
int tail_call(struct __sk_buff *sk)
{