diff mbox series

[bpf-next,v5,6/6] selftests/bpf: MUL range computation tests.

Message ID 20240506141849.185293-7-cupertino.miranda@oracle.com (mailing list archive)
State Accepted
Commit 92956786b4e26ea22e5b3c1c86cc71f5c9b3b9d8
Delegated to: BPF
Headers show
Series bpf/verifier: range computation improvements | expand

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bpf/vmtest-bpf-next-PR success PR summary

Commit Message

Cupertino Miranda May 6, 2024, 2:18 p.m. UTC 
Added a test for bound computation in MUL 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>
Acked-by: Andrii Nakryiko <andrii.nakryiko@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>
---
 .../selftests/bpf/progs/verifier_bounds.c     | 21 +++++++++++++++++++
 1 file changed, 21 insertions(+)
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/progs/verifier_bounds.c b/tools/testing/selftests/bpf/progs/verifier_bounds.c
index 7d570acf23ee..a0bb7fb40ea5 100644
--- a/tools/testing/selftests/bpf/progs/verifier_bounds.c
+++ b/tools/testing/selftests/bpf/progs/verifier_bounds.c
@@ -927,6 +927,27 @@  __naked void non_const_or_src_dst(void)
 	: __clobber_all);
 }
 
+SEC("socket")
+__description("bounds check for non const mul regs")
+__success __log_level(2)
+__msg("5: (2f) r0 *= r6                      ; R0_w=scalar(smin=smin32=0,smax=umax=smax32=umax32=3825,var_off=(0x0; 0xfff))")
+__naked void non_const_mul_regs(void)
+{
+	asm volatile ("					\
+	call %[bpf_get_prandom_u32];                    \
+	r6 = r0;					\
+	call %[bpf_get_prandom_u32];                    \
+	r6 &= 0xff;					\
+	r0 &= 0x0f;					\
+	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")