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selftests/bpf: XOR and OR range computation tests.

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Added a test for bound computation in XOR and OR when non constant
values are used and both registers have bounded ranges.

Signed-off-by: Cupertino Miranda <cupertino.miranda@oracle.com>
Acked-by: Eduard Zingerman <eddyz87@gmail.com>
Cc: Yonghong Song <yonghong.song@linux.dev>
Cc: Alexei Starovoitov <alexei.starovoitov@gmail.com>
Cc: David Faust <david.faust@oracle.com>
Cc: Jose Marchesi <jose.marchesi@oracle.com>
Cc: Elena Zannoni <elena.zannoni@oracle.com>
Cc: Andrii Nakryiko <andrii.nakryiko@gmail.com>
Link: https://lore.kernel.org/r/20240506141849.185293-5-cupertino.miranda@oracle.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
This commit is contained in:
Cupertino Miranda 2024-05-06 15:18:47 +01:00 committed by Alexei Starovoitov
parent 138cc42c05
commit 5ec9a7d13f
1 changed files with 42 additions and 0 deletions
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42
tools/testing/selftests/bpf/progs/verifier_bounds.c
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@ -885,6 +885,48 @@ l1_%=: r0 = 0; \
: __clobber_all);
}
SEC("socket")
__description("bounds check for non const xor src dst")
__success __log_level(2)
__msg("5: (af) r0 ^= r6 ; R0_w=scalar(smin=smin32=0,smax=umax=smax32=umax32=431,var_off=(0x0; 0x1af))")
__naked void non_const_xor_src_dst(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r6 = r0; \
call %[bpf_get_prandom_u32]; \
r6 &= 0xaf; \
r0 &= 0x1a0; \
r0 ^= r6; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b),
__imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("bounds check for non const or src dst")
__success __log_level(2)
__msg("5: (4f) r0 |= r6 ; R0_w=scalar(smin=smin32=0,smax=umax=smax32=umax32=431,var_off=(0x0; 0x1af))")
__naked void non_const_or_src_dst(void)
{
asm volatile (" \
call %[bpf_get_prandom_u32]; \
r6 = r0; \
call %[bpf_get_prandom_u32]; \
r6 &= 0xaf; \
r0 &= 0x1a0; \
r0 |= r6; \
exit; \
" :
: __imm(bpf_map_lookup_elem),
__imm_addr(map_hash_8b),
__imm(bpf_get_prandom_u32)
: __clobber_all);
}
SEC("socket")
__description("bounds checks after 32-bit truncation. test 1")
__success __failure_unpriv __msg_unpriv("R0 leaks addr")