From: Greg Kroah-Hartman gregkh@linuxfoundation.org
From: Tetsuo Handa penguin-kernel@I-love.SAKURA.ne.jp
commit 9c83465f3245c2faa82ffeb7016f40f02bfaa0ad upstream.
Commit db68ce10c4f0a27c ("new helper: uaccess_kernel()") replaced segment_eq(get_fs(), KERNEL_DS) with uaccess_kernel(). But the correct method for tomoyo to check whether current is a kernel thread in order to assume that kernel threads are privileged for socket operations was (current->flags & PF_KTHREAD). Now that uaccess_kernel() became 0 on x86, tomoyo has to fix this problem. Do like commit 942cb357ae7d9249 ("Smack: Handle io_uring kernel thread privileges") does.
Signed-off-by: Tetsuo Handa penguin-kernel@I-love.SAKURA.ne.jp Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- security/tomoyo/network.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/security/tomoyo/network.c +++ b/security/tomoyo/network.c @@ -613,7 +613,7 @@ static int tomoyo_check_unix_address(str static bool tomoyo_kernel_service(void) { /* Nothing to do if I am a kernel service. */ - return uaccess_kernel(); + return (current->flags & (PF_KTHREAD | PF_IO_WORKER)) == PF_KTHREAD; }
/**