From 8ebab155ea18a6d6c47b17287a0ab4633334f6eb Mon Sep 17 00:00:00 2001
From: Azeem Shaikh <azeemshaikh38@gmail.com>
Date: Wed, 30 Aug 2023 16:08:06 +0000
Subject: [PATCH] init/version.c: Replace strlcpy with strscpy
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>
---
init/version.c | 6 +++---
1 file changed, 3 insertions(+), 3 deletions(-)
diff --git a/init/version.c b/init/version.c
index f117921811b45..94c96f6fbfe6a 100644
--- a/init/version.c
+++ b/init/version.c
@@ -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);
}
--
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