Andrew, please replace previous patch with this one.
This one returns -ENOTDIR.
----------
Original patch forgot to check args->nlen.
I don't know why args->nlen == CTL_MAXNAME is rejected,
but it has been rejected traditionally.
Signed-off-by: Tetsuo Handa <[email protected]>
Cc: "Eric W. Biederman" <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
---
kernel/sysctl.c | 4 ++++
1 file changed, 4 insertions(+)
diff -puN kernel/sysctl.c~sysctl-check-length-at-deprecated_sysctl_warning kernel/sysctl.c
--- a/kernel/sysctl.c~sysctl-check-length-at-deprecated_sysctl_warning
+++ a/kernel/sysctl.c
@@ -2609,6 +2609,10 @@ static int deprecated_sysctl_warning(str
int name[CTL_MAXNAME];
int i;
+ /* Check args->nlen. */
+ if (args->nlen <= 0 || args->nlen >= CTL_MAXNAME)
+ return -ENOTDIR;
+
/* Read in the sysctl name for better debug message logging */
for (i = 0; i < args->nlen; i++)
if (get_user(name[i], args->name + i))
-
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