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cpuidle: dt: Replace deprecated strncpy() with strscpy()

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`strncpy` is deprecated for use on NUL-terminated destination strings [1].

We should prefer more robust and less ambiguous string interfaces.

A suitable replacement is `strscpy` [2] due to the fact that it guarantees
NUL-termination on the destination buffer. With this, we can also drop
the now unnecessary `CPUIDLE_(NAME|DESC)_LEN - 1` pieces.

Link: https://www.kernel.org/doc/html/latest/process/deprecated.html#strncpy-on-nul-terminated-strings [1]
Link: https://manpages.debian.org/testing/linux-manual-4.8/strscpy.9.en.html [2]
Link: https://github.com/KSPP/linux/issues/90
Cc: linux-hardening@vger.kernel.org
Signed-off-by: Justin Stitt <justinstitt@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230913-strncpy-drivers-cpuidle-dt_idle_states-c-v1-1-d16a0dbe5658@google.com
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Justin Stitt 2023-09-13 00:23:19 +00:00 committed by Kees Cook
parent 0faf84caee
commit b545465e22
1 changed files with 2 additions and 2 deletions
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4
drivers/cpuidle/dt_idle_states.c
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@ -84,8 +84,8 @@ static int init_state_node(struct cpuidle_state *idle_state,
* replace with kstrdup and pointer assignment when name
* and desc become string pointers
*/
strncpy(idle_state->name, state_node->name, CPUIDLE_NAME_LEN - 1);
strncpy(idle_state->desc, desc, CPUIDLE_DESC_LEN - 1);
strscpy(idle_state->name, state_node->name, CPUIDLE_NAME_LEN);
strscpy(idle_state->desc, desc, CPUIDLE_DESC_LEN);
return 0;
}