From: Azeem Shaikh <azeemshaikh38@gmail.com>
To: Maxim Krasnyansky <maxk@qti.qualcomm.com>
Cc: linux-hardening@vger.kernel.org,
Azeem Shaikh <azeemshaikh38@gmail.com>,
linux-kernel@vger.kernel.org, Richard Weinberger <richard@nod.at>,
Anton Ivanov <anton.ivanov@cambridgegreys.com>,
Johannes Berg <johannes@sipsolutions.net>,
linux-um@lists.infradead.org
Subject: [PATCH] uml: Replace all non-returning strlcpy with strscpy
Date: Tue, 30 May 2023 16:40:04 +0000 [thread overview]
Message-ID: <20230530164004.986750-1-azeemshaikh38@gmail.com> (raw)
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>
---
arch/um/os-Linux/drivers/tuntap_user.c | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/arch/um/os-Linux/drivers/tuntap_user.c b/arch/um/os-Linux/drivers/tuntap_user.c
index 53eb3d508645..2284e9c1cbbb 100644
--- a/arch/um/os-Linux/drivers/tuntap_user.c
+++ b/arch/um/os-Linux/drivers/tuntap_user.c
@@ -146,7 +146,7 @@ static int tuntap_open(void *data)
}
memset(&ifr, 0, sizeof(ifr));
ifr.ifr_flags = IFF_TAP | IFF_NO_PI;
- strlcpy(ifr.ifr_name, pri->dev_name, sizeof(ifr.ifr_name));
+ strscpy(ifr.ifr_name, pri->dev_name, sizeof(ifr.ifr_name));
if (ioctl(pri->fd, TUNSETIFF, &ifr) < 0) {
err = -errno;
printk(UM_KERN_ERR "TUNSETIFF failed, errno = %d\n",
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next reply other threads:[~2023-05-30 16:40 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-05-30 16:40 Azeem Shaikh [this message]
2023-05-31 3:18 ` [PATCH] uml: Replace all non-returning strlcpy with strscpy kernel test robot
2023-05-31 4:41 ` Kees Cook
2023-05-31 6:18 ` Johannes Berg
2023-05-31 6:26 ` Richard Weinberger
2023-05-31 6:23 ` Richard Weinberger
2023-05-31 8:05 ` Geert Uytterhoeven
2023-05-31 14:48 ` Azeem Shaikh
2023-06-05 20:07 ` Richard Weinberger
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