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| author | Paul Chaignon <paul.chaignon@gmail.com> | 2026-01-31 17:09:02 +0100 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2026-01-31 13:49:43 -0800 |
| commit | f0b5b3d6b56f8717e255406366d81bbcd3631660 (patch) | |
| tree | 8301bc33b4d02a4500a0a9f5a8f1bf93b1af6bac /tools/testing | |
| parent | 6557f1565d779851c4db9c488c49c05a47a6e72f (diff) | |
selftests/bpf: Test access from RO map from xdp_store_bytes
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>
Diffstat (limited to 'tools/testing')
| -rw-r--r-- | tools/testing/selftests/bpf/progs/verifier_xdp.c | 35 |
1 files changed, 35 insertions, 0 deletions
diff --git a/tools/testing/selftests/bpf/progs/verifier_xdp.c b/tools/testing/selftests/bpf/progs/verifier_xdp.c index 50768ed179b3..7dc9226aeb34 100644 --- a/tools/testing/selftests/bpf/progs/verifier_xdp.c +++ b/tools/testing/selftests/bpf/progs/verifier_xdp.c @@ -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"; |