Linux kernel mirror (for testing)
git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
kernel
os
linux
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>
authored by
Paul Chaignon
and committed by
Alexei Starovoitov
f0b5b3d6
6557f156
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+35
tools/testing/selftests/bpf/progs/verifier_xdp.c
+35
tools/testing/selftests/bpf/progs/verifier_xdp.c
···
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#include <bpf/bpf_helpers.h>
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#include "bpf_misc.h"
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struct {
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__uint(type, BPF_MAP_TYPE_ARRAY);
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__uint(max_entries, 1);
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__type(key, int);
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__type(value, __u64);
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__uint(map_flags, BPF_F_RDONLY_PROG);
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} map_array_ro SEC(".maps");
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SEC("xdp")
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__description("XDP, using ifindex from netdev")
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__success __retval(1)
···
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l0_%=: exit; \
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" :
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: __imm_const(xdp_md_ingress_ifindex, offsetof(struct xdp_md, ingress_ifindex))
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: __clobber_all);
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}
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SEC("xdp")
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__description("XDP, using xdp_store_bytes from RO map")
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__success __retval(0)
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__naked void xdp_store_bytes_from_ro_map(void)
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{
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asm volatile (" \
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r6 = r1; \
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r1 = 0; \
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*(u64*)(r10 - 8) = r1; \
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r2 = r10; \
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r2 += -8; \
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r1 = %[map_array_ro] ll; \
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call %[bpf_map_lookup_elem]; \
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if r0 == 0 goto l0_%=; \
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r1 = r6; \
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r2 = 0; \
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r3 = r0; \
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r4 = 8; \
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call %[bpf_xdp_store_bytes]; \
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l0_%=: exit; \
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" :
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: __imm(bpf_map_lookup_elem),
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__imm(bpf_xdp_store_bytes),
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__imm_addr(map_array_ro)
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: __clobber_all);
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}
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