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perf: Replace strlcpy with strscpy

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strlcpy() reads the entire source buffer first.
This read may exceed the destination size limit.
This is both inefficient and can lead to linear read
overflows if a source string is not NUL-terminated [1].
In an effort to remove strlcpy() completely [2], replace
strlcpy() here with strscpy().
No return values were used, so direct replacement is safe.

[1] https://www.kernel.org/doc/html/latest/process/deprecated.html#strlcpy
[2] https://github.com/KSPP/linux/issues/89

Signed-off-by: Azeem Shaikh <azeemshaikh38@gmail.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230703165817.2840457-1-azeemshaikh38@gmail.com
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Azeem Shaikh 2023-07-03 16:58:16 +00:00 committed by Kees Cook
parent 61ce78f29a
commit c9732f1461
1 changed files with 3 additions and 3 deletions
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6
kernel/events/core.c
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@ -8249,7 +8249,7 @@ static void perf_event_comm_event(struct perf_comm_event *comm_event)
unsigned int size;
memset(comm, 0, sizeof(comm));
strlcpy(comm, comm_event->task->comm, sizeof(comm));
strscpy(comm, comm_event->task->comm, sizeof(comm));
size = ALIGN(strlen(comm)+1, sizeof(u64));
comm_event->comm = comm;
@ -8704,7 +8704,7 @@ static void perf_event_mmap_event(struct perf_mmap_event *mmap_event)
}
cpy_name:
strlcpy(tmp, name, sizeof(tmp));
strscpy(tmp, name, sizeof(tmp));
name = tmp;
got_name:
/*
@ -9128,7 +9128,7 @@ void perf_event_ksymbol(u16 ksym_type, u64 addr, u32 len, bool unregister,
ksym_type == PERF_RECORD_KSYMBOL_TYPE_UNKNOWN)
goto err;
strlcpy(name, sym, KSYM_NAME_LEN);
strscpy(name, sym, KSYM_NAME_LEN);
name_len = strlen(name) + 1;
while (!IS_ALIGNED(name_len, sizeof(u64)))
name[name_len++] = '\0';