A-Team_Digital_Solutions/android_kernel_motorola_sm6375
Watch
2
0
Fork
You've already forked android_kernel_motorola_sm6375
 0
mirror of https://github.com/BobTheBlinker/android_kernel_motorola_sm6375.git synced 2026-10-29 03:01:39 -04:00
Code Issues Projects Releases Packages Wiki Activity

smack: off by one error

Browse source 
Consider the input case of a rule that consists entirely of non space
symbols followed by a \0. Say 64 + \0

In this case strlen(data) = 64
kzalloc of subject and object are 64 byte objects
sscanfdata, "%s %s %s", subject, ...)

will put 65 bytes into subject.

Signed-off-by: Alan Cox <[email protected]>
Acked-by: Casey Schaufler <[email protected]>
Cc: [email protected]
Signed-off-by: James Morris <[email protected]>
This commit is contained in:
Alan Cox 2012-07-26 14:47:11 -07:00 • committed by James Morris
commit 3b9fc37280
1 changed files with 4 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

8
security/smack/smackfs.c
View file

@ -323,11 +323,11 @@ static int smk_parse_long_rule(const char *data, struct smack_rule *rule,
int datalen;
int rc = -1;
/*
* This is probably inefficient, but safe.
*/
/* This is inefficient */
datalen = strlen(data);
subject = kzalloc(datalen, GFP_KERNEL);
/* Our first element can be 64 + \0 with no spaces */
subject = kzalloc(datalen + 1, GFP_KERNEL);
if (subject == NULL)
return -1;
object = kzalloc(datalen, GFP_KERNEL);