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SMACK: Do not apply star label in smack_setprocattr hook 

Smack prohibits processes from using the star ("*") and web ("@") labels.
Checks have been added in other functions. In smack_setprocattr()
hook, only check for web ("@") label has been added and restricted
from applying web ("@") label.
Check for star ("*") label should also be added in smack_setprocattr()
hook. Return error should be "-EINVAL" not "-EPERM" as permission
is there for setting label but not the label value as star ("*") or
web ("@").

Signed-off-by: Himanshu Shukla <himanshu.sh@samsung.com>
Acked-by: Casey Schaufler <casey@schaufler-ca.com>
This commit is contained in:
Himanshu Shukla 2016-11-10 16:17:49 +05:30 committed by Casey Schaufler
parent 2097f59920
commit 7128ea159d
1 changed files with 4 additions and 3 deletions
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7
security/smack/smack_lsm.c
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@ -3669,10 +3669,11 @@ static int smack_setprocattr(struct task_struct *p, char *name,
return PTR_ERR(skp);
/*
* No process is ever allowed the web ("@") label.
* No process is ever allowed the web ("@") label
* and the star ("*") label.
*/
if (skp == &smack_known_web)
return -EPERM;
if (skp == &smack_known_web || skp == &smack_known_star)
return -EINVAL;
if (!smack_privileged(CAP_MAC_ADMIN)) {
rc = -EPERM;