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selinux: ignore unknown extended permissions

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commit 900f83cf376bdaf798b6f5dcb2eae0c822e908b6 upstream.

When evaluating extended permissions, ignore unknown permissions instead
of calling BUG(). This commit ensures that future permissions can be
added without interfering with older kernels.

Cc: stable@vger.kernel.org
Fixes: fa1aa143ac ("selinux: extended permissions for ioctls")
Signed-off-by: Thiébaud Weksteen <tweek@google.com>
Signed-off-by: Paul Moore <paul@paul-moore.com>
Acked-by: Paul Moore <paul@paul-moore.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Thiébaud Weksteen 2024-12-05 12:09:19 +11:00 • committed by Greg Kroah-Hartman
parent b3a3d5333c
commit f45a77dd24
1 changed files with 6 additions and 2 deletions
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8
security/selinux/ss/services.c
View file

@ -954,7 +954,10 @@ void services_compute_xperms_decision(struct extended_perms_decision *xpermd,
xpermd->driver))
return;
} else {
BUG();
pr_warn_once(
"SELinux: unknown extended permission (%u) will be ignored\n",
node->datum.u.xperms->specified);
return;
}
if (node->key.specified == AVTAB_XPERMS_ALLOWED) {
@ -991,7 +994,8 @@ void services_compute_xperms_decision(struct extended_perms_decision *xpermd,
node->datum.u.xperms->perms.p[i];
}
} else {
BUG();
pr_warn_once("SELinux: unknown specified key (%u)\n",
node->key.specified);
}
}