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[bpf-next,v3,10/12] selftests/bpf: Add dynptr var_off tests

Message ID 20230120034314.1921848-11-memxor@gmail.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series Dynptr fixes | expand

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netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 0 this patch: 0
netdev/cc_maintainers warning 11 maintainers not CCed: linux-kselftest@vger.kernel.org kpsingh@kernel.org haoluo@google.com song@kernel.org yhs@fb.com martin.lau@linux.dev sdf@google.com john.fastabend@gmail.com shuah@kernel.org jolsa@kernel.org mykolal@fb.com
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Commit Message

Kumar Kartikeya Dwivedi Jan. 20, 2023, 3:43 a.m. UTC 
Ensure that variable offset is handled correctly, and verifier takes
both fixed and variable part into account. Also ensures that only
constant var_off is allowed.

Signed-off-by: Kumar Kartikeya Dwivedi <memxor@gmail.com>
---
 .../testing/selftests/bpf/progs/dynptr_fail.c | 40 +++++++++++++++++++
 1 file changed, 40 insertions(+)
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/progs/dynptr_fail.c b/tools/testing/selftests/bpf/progs/dynptr_fail.c
index 8f7b239b8503..9477c238af57 100644
--- a/tools/testing/selftests/bpf/progs/dynptr_fail.c
+++ b/tools/testing/selftests/bpf/progs/dynptr_fail.c
@@ -794,3 +794,43 @@  int dynptr_pruning_type_confusion(struct __sk_buff *ctx)
 	);
 	return 0;
 }
+
+SEC("?tc")
+__failure __msg("dynptr has to be at a constant offset") __log_level(2)
+int dynptr_var_off_overwrite(struct __sk_buff *ctx)
+{
+	asm volatile (
+		"r9 = 16;"
+		"*(u32 *)(r10 - 4) = r9;"
+		"r8 = *(u32 *)(r10 - 4);"
+		"if r8 >= 0 goto vjmp1;"
+		"r0 = 1;"
+		"exit;"
+	"vjmp1:"
+		"if r8 <= 16 goto vjmp2;"
+		"r0 = 1;"
+		"exit;"
+	"vjmp2:"
+		"r8 &= 16;"
+		"r1 = %[ringbuf] ll;"
+		"r2 = 8;"
+		"r3 = 0;"
+		"r4 = r10;"
+		"r4 += -32;"
+		"r4 += r8;"
+		"call %[bpf_ringbuf_reserve_dynptr];"
+		"r9 = 0xeB9F;"
+		"*(u64 *)(r10 - 16) = r9;"
+		"r1 = r10;"
+		"r1 += -32;"
+		"r1 += r8;"
+		"r2 = 0;"
+		"call %[bpf_ringbuf_discard_dynptr];"
+		:
+		: __imm(bpf_ringbuf_reserve_dynptr),
+		  __imm(bpf_ringbuf_discard_dynptr),
+		  __imm_addr(ringbuf)
+		: __clobber_all
+	);
+	return 0;
+}