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The meaning of the "len" parameter in the my_strncat function is the size limit for copying characters from "from", not the size limit for "to" after copying. Also, the "#define safestrcat(to, from) my_strncat(to, from, sizeof(to) - strlen(to) - 1)" has already imposed a limit on max based on the size of "to". Modify the function to prevent truncation of content when too many bytes are passed to the my_strcat function. Signed-off-by: songliang <YS.songliang@h3c.com>
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The bug was introduced by upstream commit [1] where strncat was replaced with char dest[32] = "/sys/devices/platform/axi"; Will result in dest string being: /sys/ and not the expected: /sys/devices/platform/axi/ [1] 0719881 |
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The meaning of the "len" parameter in the my_strncat function is the size limit for copying characters from "from", not the size limit for "to" after copying.
Also, the "#define safestrcat(to, from) my_strncat(to, from, sizeof(to) - strlen(to) - 1)" has already imposed a limit on max based on the size of "to".
Modify the function to prevent truncation of content when too many bytes are passed to the my_strcat function.