diff mbox series

[bpf,6/7] selftests/bpf: Test multiplication overflow of nr_bits in bits_iter

Message ID 20241008091718.3797027-7-houtao@huaweicloud.com (mailing list archive)
State Superseded
Delegated to: BPF
Headers show
Series Misc fixes for bpf | expand

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Commit Message

Hou Tao Oct. 8, 2024, 9:17 a.m. UTC 
From: Hou Tao <houtao1@huawei.com>

Add a test to verify the multiplication overflow of nr_bits in bits_iter.
When nr_words is assigned as 67108865, nr_bits becomes 64, causing
bpf_probe_read_kernel_common() to corrupt the stack.

Signed-off-by: Hou Tao <houtao1@huawei.com>
---
 .../selftests/bpf/progs/verifier_bits_iter.c       | 14 ++++++++++++++
 1 file changed, 14 insertions(+)
diff mbox series

Patch

diff --git a/tools/testing/selftests/bpf/progs/verifier_bits_iter.c b/tools/testing/selftests/bpf/progs/verifier_bits_iter.c
index f4da4d508ddb..344b7eac15c8 100644
--- a/tools/testing/selftests/bpf/progs/verifier_bits_iter.c
+++ b/tools/testing/selftests/bpf/progs/verifier_bits_iter.c
@@ -151,3 +151,17 @@  int zero_words(void)
 		nr++;
 	return nr;
 }
+
+SEC("syscall")
+__description("big words")
+__success __retval(0)
+int big_words(void)
+{
+	u64 data[8] = {0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1, 0x1};
+	int nr = 0;
+	int *bit;
+
+	bpf_for_each(bits, bit, &data[0], 67108865)
+		nr++;
+	return nr;
+}