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 11:11:45 -04:00
Code Issues Projects Releases Packages Wiki Activity

proc: prevent changes to overridden credentials

Browse source 
Prevent userspace from changing the the /proc/PID/attr values if the
task's credentials are currently overriden.  This not only makes sense
conceptually, it also prevents some really bizarre error cases caused
when trying to commit credentials to a task with overridden
credentials.

Cc: <[email protected]>
Reported-by: "chengjian (D)" <[email protected]>
Signed-off-by: Paul Moore <[email protected]>
Acked-by: John Johansen <[email protected]>
Acked-by: James Morris <[email protected]>
Acked-by: Casey Schaufler <[email protected]>
This commit is contained in:
Paul Moore 2019-04-19 14:55:12 -04:00
commit 35a196bef4
1 changed files with 5 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

5
fs/proc/base.c
View file

@ -2539,6 +2539,11 @@ static ssize_t proc_pid_attr_write(struct file * file, const char __user * buf,
rcu_read_unlock();
return -EACCES;
}
/* Prevent changes to overridden credentials. */
if (current_cred() != current_real_cred()) {
rcu_read_unlock();
return -EBUSY;
}
rcu_read_unlock();
if (count > PAGE_SIZE)