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selftests/bpf: Test access from RO map from xdp_store_bytes

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This new test simply checks that helper bpf_xdp_store_bytes can
successfully read from a read-only map.

Signed-off-by: Paul Chaignon <paul.chaignon@gmail.com>
Link: https://lore.kernel.org/r/4fdb934a713b2d7cf133288c77f6cfefe9856440.1769875479.git.paul.chaignon@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Paul Chaignon 2026-01-31 17:09:02 +01:00 committed by Alexei Starovoitov
parent 6557f1565d
commit f0b5b3d6b5
1 changed files with 35 additions and 0 deletions
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35
tools/testing/selftests/bpf/progs/verifier_xdp.c
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@ -5,6 +5,14 @@
#include <bpf/bpf_helpers.h>
#include "bpf_misc.h"
struct {
__uint(type, BPF_MAP_TYPE_ARRAY);
__uint(max_entries, 1);
__type(key, int);
__type(value, __u64);
__uint(map_flags, BPF_F_RDONLY_PROG);
} map_array_ro SEC(".maps");
SEC("xdp")
__description("XDP, using ifindex from netdev")
__success __retval(1)
@ -21,4 +29,31 @@ l0_%=: exit; \
: __clobber_all);
}
SEC("xdp")
__description("XDP, using xdp_store_bytes from RO map")
__success __retval(0)
__naked void xdp_store_bytes_from_ro_map(void)
{
asm volatile (" \
r6 = r1; \
r1 = 0; \
*(u64*)(r10 - 8) = r1; \
r2 = r10; \
r2 += -8; \
r1 = %[map_array_ro] ll; \
call %[bpf_map_lookup_elem]; \
if r0 == 0 goto l0_%=; \
r1 = r6; \
r2 = 0; \
r3 = r0; \
r4 = 8; \
call %[bpf_xdp_store_bytes]; \
l0_%=: exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm(bpf_xdp_store_bytes),
__imm_addr(map_array_ro)
: __clobber_all);
}
char _license[] SEC("license") = "GPL";