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selftests/bpf: Add test for narrow ctx load for pointer args

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Ensure that performing narrow ctx loads other than size == 8 are
rejected when the argument is a pointer type.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
Link: https://lore.kernel.org/r/20241212092050.3204165-3-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Kumar Kartikeya Dwivedi 2024-12-12 01:20:50 -08:00 committed by Alexei Starovoitov
parent 659b9ba7cb
commit 8025731c28
1 changed files with 36 additions and 0 deletions
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36
tools/testing/selftests/bpf/progs/verifier_btf_ctx_access.c
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@ -29,4 +29,40 @@ __naked void ctx_access_u32_pointer_accept(void)
" ::: __clobber_all);
}
SEC("fentry/bpf_fentry_test9")
__description("btf_ctx_access u32 pointer reject u32")
__failure __msg("size 4 must be 8")
__naked void ctx_access_u32_pointer_reject_32(void)
{
asm volatile (" \
r2 = *(u32 *)(r1 + 0); /* load 1st argument with narrow load */\
r0 = 0; \
exit; \
" ::: __clobber_all);
}
SEC("fentry/bpf_fentry_test9")
__description("btf_ctx_access u32 pointer reject u16")
__failure __msg("size 2 must be 8")
__naked void ctx_access_u32_pointer_reject_16(void)
{
asm volatile (" \
r2 = *(u16 *)(r1 + 0); /* load 1st argument with narrow load */\
r0 = 0; \
exit; \
" ::: __clobber_all);
}
SEC("fentry/bpf_fentry_test9")
__description("btf_ctx_access u32 pointer reject u8")
__failure __msg("size 1 must be 8")
__naked void ctx_access_u32_pointer_reject_8(void)
{
asm volatile (" \
r2 = *(u8 *)(r1 + 0); /* load 1st argument with narrow load */\
r0 = 0; \
exit; \
" ::: __clobber_all);
}
char _license[] SEC("license") = "GPL";