ich777/linux_media
1
0
Fork 0
mirror of https://github.com/tbsdtv/linux_media.git synced 2025-07-23 12:43:29 +02:00
Code Issues Packages Projects Releases Wiki Activity

security: Add LSM hook to setgroups() syscall

Browse Source 
Give the LSM framework the ability to filter setgroups() syscalls. There
are already analagous hooks for the set*uid() and set*gid() syscalls.
The SafeSetID LSM will use this new hook to ensure setgroups() calls are
allowed by the installed security policy. Tested by putting print
statement in security_task_fix_setgroups() hook and confirming that it
gets hit when userspace does a setgroups() syscall.

Acked-by: Casey Schaufler <casey@schaufler-ca.com>
Reviewed-by: Serge Hallyn <serge@hallyn.com>
Signed-off-by: Micah Morton <mortonm@chromium.org>
This commit is contained in:
Micah Morton
2022-06-08 20:57:11 +00:00
parent a1732d6898
commit fcfe0ac2fc
5 changed files with 33 additions and 0 deletions
Download Patch File Download Diff File Expand all files Collapse all files

13
kernel/groups.c
View File

@@ -134,13 +134,26 @@ EXPORT_SYMBOL(set_groups);
int set_current_groups(struct group_info *group_info)
{
struct cred *new;
const struct cred *old;
int retval;
new = prepare_creds();
if (!new)
return -ENOMEM;
old = current_cred();
set_groups(new, group_info);
retval = security_task_fix_setgroups(new, old);
if (retval < 0)
goto error;
return commit_creds(new);
error:
abort_creds(new);
return retval;
}
EXPORT_SYMBOL(set_current_groups);