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

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: e7d316a02f ("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>
This commit is contained in:
Liping Zhang 2017-04-07 23:51:07 +08:00 committed by Linus Torvalds
parent 8b65bb57d8
commit 425fffd886
1 changed files with 2 additions and 0 deletions
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kernel/sysctl.c
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@ -2133,6 +2133,8 @@ static int do_proc_douintvec_conv(bool *negp, unsigned long *lvalp,
if (write) { if (write) {
if (*negp) if (*negp)
return -EINVAL; return -EINVAL;
if (*lvalp > UINT_MAX)
return -EINVAL;
*valp = *lvalp; *valp = *lvalp;
} else { } else {
unsigned int val = *valp; unsigned int val = *valp;