Patch "sysctl: report EINVAL if value is larger than UINT_MAX for proc_douintvec" has been added to the 4.4-stable tree

Patch "sysctl: report EINVAL if value is larger than UINT_MAX for proc_douintvec" has been added to the 4.4-stable tree

[gregkh]

This is a note to let you know that I've just added the patch titled

    sysctl: report EINVAL if value is larger than UINT_MAX for proc_douintvec

to the 4.4-stable tree which can be found at:
    http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary

The filename of the patch is:
     sysctl-report-einval-if-value-is-larger-than-uint_max-for-proc_douintvec.patch
and it can be found in the queue-4.4 subdirectory.

If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@vger.kernel.org> know about it.


>From 425fffd886bae3d127a08fa6a17f2e31e24ed7ff Mon Sep 17 00:00:00 2001
From: Liping Zhang <zlpnobody@gmail.com>
Date: Fri, 7 Apr 2017 23:51:07 +0800
Subject: sysctl: report EINVAL if value is larger than UINT_MAX for proc_douintvec

From: Liping Zhang <zlpnobody@gmail.com>

commit 425fffd886bae3d127a08fa6a17f2e31e24ed7ff upstream.

Currently, inputting the following command will succeed but actually the
value will be truncated:

  # echo 0x12ffffffff > /proc/sys/net/ipv4/tcp_notsent_lowat

This is not friendly to the user, so instead, we should report error
when the value is larger than UINT_MAX.

Fixes: e7d316a02f68 ("sysctl: handle error writing UINT_MAX to u32 fields")
Signed-off-by: Liping Zhang <zlpnobody@gmail.com>
Cc: Subash Abhinov Kasiviswanathan <subashab@codeaurora.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Eric W. Biederman <ebiederm@xmission.com>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

---
 kernel/sysctl.c |    2 ++
 1 file changed, 2 insertions(+)

--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2067,6 +2067,8 @@ static int do_proc_douintvec_conv(bool *
 	if (write) {
 		if (*negp)
 			return -EINVAL;
+		if (*lvalp > UINT_MAX)
+			return -EINVAL;
 		*valp = *lvalp;
 	} else {
 		unsigned int val = *valp;


Patches currently in stable-queue which might be from zlpnobody@gmail.com are

queue-4.4/sysctl-don-t-print-negative-flag-for-proc_douintvec.patch
queue-4.4/sysctl-report-einval-if-value-is-larger-than-uint_max-for-proc_douintvec.patch