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selftests/bpf: Test changing packet data from global functions with a kfunc

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The verifier should invalidate all packet pointers after a packet data
changing kfunc is called. So, similar to commit 3f23ee5590
("selftests/bpf: test for changing packet data from global functions"),
test changing packet data from global functions to make sure packet
pointers are indeed invalidated.

Signed-off-by: Amery Hung <ameryhung@gmail.com>
Signed-off-by: Martin KaFai Lau <martin.lau@kernel.org>
Link: https://patch.msgid.link/20250925170013.1752561-2-ameryhung@gmail.com
This commit is contained in:
Amery Hung
2025-09-25 10:00:13 -07:00
committed by Martin KaFai Lau
parent bc8712f2b5
commit 1193c46c17
1 changed files with 29 additions and 1 deletions
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30
tools/testing/selftests/bpf/progs/verifier_sock.c
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@@ -1,7 +1,7 @@
// SPDX-License-Identifier: GPL-2.0
/* Converted from tools/testing/selftests/bpf/verifier/sock.c */
#include <linux/bpf.h>
#include "vmlinux.h"
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
@@ -1068,6 +1068,34 @@ int invalidate_pkt_pointers_from_global_func(struct __sk_buff *sk)
return TCX_PASS;
}
__noinline
long xdp_pull_data2(struct xdp_md *x, __u32 len)
{
return bpf_xdp_pull_data(x, len);
}
__noinline
long xdp_pull_data1(struct xdp_md *x, __u32 len)
{
return xdp_pull_data2(x, len);
}
/* global function calls bpf_xdp_pull_data(), which invalidates packet
* pointers established before global function call.
*/
SEC("xdp")
__failure __msg("invalid mem access")
int invalidate_xdp_pkt_pointers_from_global_func(struct xdp_md *x)
{
int *p = (void *)(long)x->data;
if ((void *)(p + 1) > (void *)(long)x->data_end)
return XDP_DROP;
xdp_pull_data1(x, 0);
*p = 42; /* this is unsafe */
return XDP_PASS;
}
__noinline
int tail_call(struct __sk_buff *sk)
{