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init/version.c: 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: Justin Stitt <justinstitt@google.com>
Reviewed-by: Kees Cook <keescook@chromium.org>
Link: https://lore.kernel.org/r/20230830160806.3821893-1-azeemshaikh38@gmail.com
Signed-off-by: Kees Cook <keescook@chromium.org>
This commit is contained in:
Azeem Shaikh 2023-08-30 16:08:06 +00:00 committed by Kees Cook
parent 215199e3d9
commit 8ebab155ea
1 changed files with 3 additions and 3 deletions
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6
init/version.c
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@ -21,10 +21,10 @@ static int __init early_hostname(char *arg)
{
size_t bufsize = sizeof(init_uts_ns.name.nodename);
size_t maxlen = bufsize - 1;
size_t arglen;
ssize_t arglen;
arglen = strlcpy(init_uts_ns.name.nodename, arg, bufsize);
if (arglen > maxlen) {
arglen = strscpy(init_uts_ns.name.nodename, arg, bufsize);
if (arglen < 0) {
pr_warn("hostname parameter exceeds %zd characters and will be truncated",
maxlen);
}