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selftests/bpf: Check combination of jit blinding and pointers to bpf subprogs. 

Check that ld_imm64 with src_reg=1 (aka BPF_PSEUDO_FUNC) works
with jit_blinding.

Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Signed-off-by: Daniel Borkmann <daniel@iogearbox.net>
Acked-by: Andrii Nakryiko <andrii@kernel.org>
Acked-by: Martin KaFai Lau <kafai@fb.com>
Link: https://lore.kernel.org/bpf/20220513011025.13344-2-alexei.starovoitov@gmail.com
This commit is contained in:
Alexei Starovoitov 2022-05-12 18:10:25 -07:00 committed by Daniel Borkmann
parent 4b6313cf99
commit 365d519923
1 changed files with 8 additions and 0 deletions
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8
tools/testing/selftests/bpf/progs/test_subprogs.c
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@ -89,6 +89,11 @@ int prog2(void *ctx)
return 0; return 0;
} }
static int empty_callback(__u32 index, void *data)
{
return 0;
}
/* prog3 has the same section name as prog1 */ /* prog3 has the same section name as prog1 */
SEC("raw_tp/sys_enter") SEC("raw_tp/sys_enter")
int prog3(void *ctx) int prog3(void *ctx)
@ -98,6 +103,9 @@ int prog3(void *ctx)
if (!BPF_CORE_READ(t, pid) || !get_task_tgid((uintptr_t)t)) if (!BPF_CORE_READ(t, pid) || !get_task_tgid((uintptr_t)t))
return 1; return 1;
/* test that ld_imm64 with BPF_PSEUDO_FUNC doesn't get blinded */
bpf_loop(1, empty_callback, NULL, 0);
res3 = sub3(5) + 6; /* (5 + 3 + (4 + 1)) + 6 = 19 */ res3 = sub3(5) + 6; /* (5 + 3 + (4 + 1)) + 6 = 19 */
return 0; return 0;
} }