Fix bpf_strnstr len error #5861
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strnstr should not treat the ending '\0' of s2 as a matching character
if the parameter 'len' equal to s2 string length, for example:
1. bpf_strnstr("openat", "open", 4) = -ENOENT
2. bpf_strnstr("openat", "open", 5) = 0
This patch makes (1) return 0, fix just the `len == strlen(s2)` case.
And fix a more general case when s2 is a suffix of the first len
characters of s1.
Fixes: e913705 ("bpf: Add kfuncs for read-only string operations")
Signed-off-by: Rong Tao <[email protected]>
Add tests for bpf_strnstr():
bpf_strnstr("", "", 0) = 0
bpf_strnstr("hello world", "hello", 5) = 0
bpf_strnstr(str, "hello", 4) = -ENOENT
bpf_strnstr("", "a", 0) = -ENOENT
Signed-off-by: Rong Tao <[email protected]>
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Upstream branch: 98857d1 |
Author
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At least one diff in series https://patchwork.kernel.org/project/netdevbpf/list/?series=996992 irrelevant now. Closing PR. |
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Pull request for series with
subject: Fix bpf_strnstr len error
version: 5
url: https://patchwork.kernel.org/project/netdevbpf/list/?series=996992