diff mbox series

[v2,3/3] selftests/bpf: Check overflow in optional buffer

Message ID 20230502005218.3627530-3-drosen@google.com (mailing list archive)
State Changes Requested
Delegated to: BPF
Headers show
Series [v2,1/3] bpf: Allow NULL buffers in bpf_dynptr_slice(_rw) | expand

Checks

Context Check Description
bpf/vmtest-bpf-VM_Test-11 success Logs for test_maps on x86_64 with gcc
bpf/vmtest-bpf-VM_Test-12 success Logs for test_maps on x86_64 with llvm-16
bpf/vmtest-bpf-VM_Test-13 fail Logs for test_progs on aarch64 with gcc
bpf/vmtest-bpf-VM_Test-14 fail Logs for test_progs on aarch64 with llvm-16
bpf/vmtest-bpf-VM_Test-16 fail Logs for test_progs on x86_64 with gcc
bpf/vmtest-bpf-VM_Test-17 fail Logs for test_progs on x86_64 with llvm-16
bpf/vmtest-bpf-VM_Test-18 fail Logs for test_progs_no_alu32 on aarch64 with gcc
bpf/vmtest-bpf-VM_Test-19 fail Logs for test_progs_no_alu32 on aarch64 with llvm-16
bpf/vmtest-bpf-VM_Test-21 fail Logs for test_progs_no_alu32 on x86_64 with gcc
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bpf/vmtest-bpf-VM_Test-30 success Logs for test_progs_parallel on x86_64 with llvm-16
bpf/vmtest-bpf-VM_Test-31 success Logs for test_verifier on aarch64 with gcc
bpf/vmtest-bpf-VM_Test-32 success Logs for test_verifier on aarch64 with llvm-16
bpf/vmtest-bpf-VM_Test-33 success Logs for test_verifier on s390x with gcc
bpf/vmtest-bpf-VM_Test-34 success Logs for test_verifier on x86_64 with gcc
bpf/vmtest-bpf-VM_Test-35 success Logs for test_verifier on x86_64 with llvm-16
bpf/vmtest-bpf-VM_Test-36 success Logs for veristat
bpf/vmtest-bpf-VM_Test-15 fail Logs for test_progs on s390x with gcc
bpf/vmtest-bpf-VM_Test-20 fail Logs for test_progs_no_alu32 on s390x with gcc
netdev/series_format warning Series does not have a cover letter
netdev/tree_selection success Guessed tree name to be net-next
netdev/fixes_present success Fixes tag not required for -next series
netdev/header_inline success No static functions without inline keyword in header files
netdev/build_32bit success Errors and warnings before: 8 this patch: 8
netdev/cc_maintainers warning 1 maintainers not CCed: memxor@gmail.com
netdev/build_clang success Errors and warnings before: 8 this patch: 8
netdev/verify_signedoff success Signed-off-by tag matches author and committer
netdev/deprecated_api success None detected
netdev/check_selftest success No net selftest shell script
netdev/verify_fixes success No Fixes tag
netdev/build_allmodconfig_warn success Errors and warnings before: 8 this patch: 8
netdev/checkpatch success total: 0 errors, 0 warnings, 0 checks, 23 lines checked
netdev/kdoc success Errors and warnings before: 0 this patch: 0
netdev/source_inline success Was 0 now: 0
bpf/vmtest-bpf-VM_Test-10 success Logs for test_maps on s390x with gcc
bpf/vmtest-bpf-PR success PR summary
bpf/vmtest-bpf-VM_Test-1 success Logs for ${{ matrix.test }} on ${{ matrix.arch }} with ${{ matrix.toolchain_full }}
bpf/vmtest-bpf-VM_Test-2 success Logs for ShellCheck
bpf/vmtest-bpf-VM_Test-3 fail Logs for build for aarch64 with gcc
bpf/vmtest-bpf-VM_Test-4 fail Logs for build for aarch64 with llvm-16
bpf/vmtest-bpf-VM_Test-5 fail Logs for build for s390x with gcc
bpf/vmtest-bpf-VM_Test-6 success Logs for build for x86_64 with gcc
bpf/vmtest-bpf-VM_Test-7 success Logs for build for x86_64 with llvm-16
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bpf/vmtest-bpf-VM_Test-9 success Logs for veristat

Commit Message

Daniel Rosenberg May 2, 2023, 12:52 a.m. UTC 
This ensures we still reject invalid memory accesses in buffers that are
marked optional.

Signed-off-by: Daniel Rosenberg <drosen@google.com>
---
 .../testing/selftests/bpf/progs/dynptr_fail.c | 20 +++++++++++++++++++
 1 file changed, 20 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 759eb5c245cd..ee98f7ce0b0d 100644
--- a/tools/testing/selftests/bpf/progs/dynptr_fail.c
+++ b/tools/testing/selftests/bpf/progs/dynptr_fail.c
@@ -1378,3 +1378,23 @@  int invalid_slice_rdwr_rdonly(struct __sk_buff *skb)
 
 	return 0;
 }
+
+/* Buffers that are provided must be sufficiently long */
+SEC("?cgroup_skb/egress")
+__failure __msg("memory, len pair leads to invalid memory access")
+int test_dynptr_skb_small_buff(struct __sk_buff *skb)
+{
+	struct bpf_dynptr ptr;
+	char buffer[8] = {};
+	__u64 *data;
+
+	if (bpf_dynptr_from_skb(skb, 0, &ptr)) {
+		err = 1;
+		return 1;
+	}
+
+	/* This may return NULL. SKB may require a buffer */
+	data = bpf_dynptr_slice(&ptr, 0, buffer, 9);
+
+	return !!data;
+}