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authorZev Weiss <zev@bewilderbeest.net>2019-03-11 23:28:02 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2019-03-12 10:04:00 -0700
commit8cf7630b29701d364f8df4a50e4f1f5e752b2778 (patch)
treec321055315f9bdfcd4350ee37f84f32db569965f
parentfec52486682f7b3af2ffc28bcacc6e2ad6f7e1e6 (diff)
downloadlinux-8cf7630b29701d364f8df4a50e4f1f5e752b2778.tar.bz2
kernel/sysctl.c: add missing range check in do_proc_dointvec_minmax_conv
This bug has apparently existed since the introduction of this function in the pre-git era (4500e91754d3 in Thomas Gleixner's history.git, "[NET]: Add proc_dointvec_userhz_jiffies, use it for proper handling of neighbour sysctls."). As a minimal fix we can simply duplicate the corresponding check in do_proc_dointvec_conv(). Link: http://lkml.kernel.org/r/20190207123426.9202-3-zev@bewilderbeest.net Signed-off-by: Zev Weiss <zev@bewilderbeest.net> Cc: Brendan Higgins <brendanhiggins@google.com> Cc: Iurii Zaikin <yzaikin@google.com> Cc: Kees Cook <keescook@chromium.org> Cc: Luis Chamberlain <mcgrof@kernel.org> Cc: <stable@vger.kernel.org> [2.6.2+] Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
-rw-r--r--kernel/sysctl.c11
1 files changed, 10 insertions, 1 deletions
diff --git a/kernel/sysctl.c b/kernel/sysctl.c
index 7bb3988425ee..0854197e0e67 100644
--- a/kernel/sysctl.c
+++ b/kernel/sysctl.c
@@ -2645,7 +2645,16 @@ static int do_proc_dointvec_minmax_conv(bool *negp, unsigned long *lvalp,
{
struct do_proc_dointvec_minmax_conv_param *param = data;
if (write) {
- int val = *negp ? -*lvalp : *lvalp;
+ int val;
+ if (*negp) {
+ if (*lvalp > (unsigned long) INT_MAX + 1)
+ return -EINVAL;
+ val = -*lvalp;
+ } else {
+ if (*lvalp > (unsigned long) INT_MAX)
+ return -EINVAL;
+ val = *lvalp;
+ }
if ((param->min && *param->min > val) ||
(param->max && *param->max < val))
return -EINVAL;