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security: Add LSM hooks to set*gid syscalls

Browse Source 
The SafeSetID LSM uses the security_task_fix_setuid hook to filter
set*uid() syscalls according to its configured security policy. In
preparation for adding analagous support in the LSM for set*gid()
syscalls, we add the requisite hook here. Tested by putting print
statements in the security_task_fix_setgid hook and seeing them get hit
during kernel boot.

Signed-off-by: Thomas Cedeno <thomascedeno@google.com>
Signed-off-by: Micah Morton <mortonm@chromium.org>
This commit is contained in:
Thomas Cedeno
2020-06-09 10:22:13 -07:00
committed by Micah Morton
parent 3d77e6a880
commit 39030e1351
5 changed files with 40 additions and 1 deletions
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15
kernel/sys.c
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@@ -393,6 +393,10 @@ long __sys_setregid(gid_t rgid, gid_t egid)
new->sgid = new->egid;
new->fsgid = new->egid;
retval = security_task_fix_setgid(new, old, LSM_SETID_RE);
if (retval < 0)
goto error;
return commit_creds(new);
error:
@@ -435,6 +439,10 @@ long __sys_setgid(gid_t gid)
else
goto error;
retval = security_task_fix_setgid(new, old, LSM_SETID_ID);
if (retval < 0)
goto error;
return commit_creds(new);
error:
@@ -756,6 +764,10 @@ long __sys_setresgid(gid_t rgid, gid_t egid, gid_t sgid)
new->sgid = ksgid;
new->fsgid = new->egid;
retval = security_task_fix_setgid(new, old, LSM_SETID_RES);
if (retval < 0)
goto error;
return commit_creds(new);
error:
@@ -862,7 +874,8 @@ long __sys_setfsgid(gid_t gid)
ns_capable(old->user_ns, CAP_SETGID)) {
if (!gid_eq(kgid, old->fsgid)) {
new->fsgid = kgid;
goto change_okay;
if (security_task_fix_setgid(new,old,LSM_SETID_FS) == 0)
goto change_okay;
}
}