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kobject: 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().

Direct replacement is safe here since return value of -errno
is used to check for truncation instead of sizeof(dest).

[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/20230831140104.207019-1-azeemshaikh38@gmail.com
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Azeem Shaikh 2023-08-31 14:01:04 +00:00 committed by Kees Cook
parent 8ebab155ea
commit 6cd59324c6
1 changed files with 4 additions and 4 deletions
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8
lib/kobject_uevent.c
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@ -254,10 +254,10 @@ static int init_uevent_argv(struct kobj_uevent_env *env, const char *subsystem)
int buffer_size = sizeof(env->buf) - env->buflen;
int len;
len = strlcpy(&env->buf[env->buflen], subsystem, buffer_size);
if (len >= buffer_size) {
pr_warn("init_uevent_argv: buffer size of %d too small, needed %d\n",
buffer_size, len);
len = strscpy(&env->buf[env->buflen], subsystem, buffer_size);
if (len < 0) {
pr_warn("%s: insufficient buffer space (%u left) for %s\n",
__func__, buffer_size, subsystem);
return -ENOMEM;
}