[PATCH bpf-next v3 4/6] selftests/bpf: XOR and OR range computation tests.

[Cupertino Miranda <cupertino.miranda@oracle.com>]

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>
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     | 42 +++++++++++++++++++
 1 file changed, 42 insertions(+)

diff --git a/tools/testing/selftests/bpf/progs/verifier_bounds.c b/tools/testing/selftests/bpf/progs/verifier_bounds.c
index 960998f16306..aeb88a9c7a86 100644
--- a/tools/testing/selftests/bpf/progs/verifier_bounds.c
+++ b/tools/testing/selftests/bpf/progs/verifier_bounds.c
@@ -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=255,var_off=(0x0; 0xff))")
+__naked void non_const_xor_src_dst(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 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=255,var_off=(0x0; 0xff))")
+__naked void non_const_or_src_dst(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")
-- 
2.39.2