ARC: signal handling robustify

commit e4140819dadc3624accac8294881bca8a3cba4ed upstream.

A malicious signal handler / restorer can DOS the system by fudging the
user regs saved on stack, causing weird things such as sigreturn returning
to user mode PC but cpu state still being kernel mode....

Ensure that in sigreturn path status32 always has U bit; any other bogosity
(gargbage PC etc) will be taken care of by normal user mode exceptions mechanisms.

Reproducer signal handler:

    void handle_sig(int signo, siginfo_t *info, void *context)
    {
	ucontext_t *uc = context;
	struct user_regs_struct *regs = &(uc->uc_mcontext.regs);

	regs->scratch.status32 = 0;
    }

Before the fix, kernel would go off to weeds like below:

    --------->8-----------
    [ARCLinux]$ ./signal-test
    Path: /signal-test
    CPU: 0 PID: 61 Comm: signal-test Not tainted 4.0.0-rc5+ #65
    task: 8f177880 ti: 5ffe6000 task.ti: 8f15c000

    [ECR   ]: 0x00220200 => Invalid Write @ 0x00000010 by insn @ 0x00010698
    [EFA   ]: 0x00000010
    [BLINK ]: 0x2007c1ee
    [ERET  ]: 0x10698
    [STAT32]: 0x00000000 :                                   <--------
    BTA: 0x00010680	 SP: 0x5ffe7e48	 FP: 0x00000000
    LPS: 0x20003c6c	LPE: 0x20003c70	LPC: 0x00000000
    ...
    --------->8-----------

Reported-by: Alexey Brodkin <abrodkin@synopsys.com>
Signed-off-by: Vineet Gupta <vgupta@synopsys.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/arc/kernel/signal.c b/arch/arc/kernel/signal.c
index 7e95e1a86510fee2f2e1511f8bc7b63f8fb48122..6763654239a22979bbf21649f07e9bb2edfbdf5c 100644 (file)
--- a/arch/arc/kernel/signal.c
+++ b/arch/arc/kernel/signal.c
@@ -131,6 +131,15 @@ SYSCALL_DEFINE0(rt_sigreturn)
        /* Don't restart from sigreturn */
        syscall_wont_restart(regs);
 
+       /*
+        * Ensure that sigreturn always returns to user mode (in case the
+        * regs saved on user stack got fudged between save and sigreturn)
+        * Otherwise it is easy to panic the kernel with a custom
+        * signal handler and/or restorer which clobberes the status32/ret
+        * to return to a bogus location in kernel mode.
+        */
+       regs->status32 |= STATUS_U_MASK;
+
        return regs->r0;
 
 badframe:
@@ -234,8 +243,11 @@ setup_rt_frame(int signo, struct k_sigaction *ka, siginfo_t *info,
 
        /*
         * handler returns using sigreturn stub provided already by userpsace
+        * If not, nuke the process right away
         */
-       BUG_ON(!(ka->sa.sa_flags & SA_RESTORER));
+       if(!(ka->sa.sa_flags & SA_RESTORER))
+               return 1;
+
        regs->blink = (unsigned long)ka->sa.sa_restorer;
 
        /* User Stack for signal handler will be above the frame just carved */
@@ -302,12 +314,12 @@ handle_signal(unsigned long sig, struct k_sigaction *ka, siginfo_t *info,
              struct pt_regs *regs)
 {
        sigset_t *oldset = sigmask_to_save();
-       int ret;
+       int failed;
 
        /* Set up the stack frame */
-       ret = setup_rt_frame(sig, ka, info, oldset, regs);
+       failed = setup_rt_frame(sig, ka, info, oldset, regs);
 
-       if (ret)
+       if (failed)
                force_sigsegv(sig, current);
        else
                signal_delivered(sig, info, ka, regs, 0);