[PATCH] uml: fix segfault on signal delivery

This fixes a process segfault where a signal was being delivered such that a
new stack page needed to be allocated to hold the signal frame.  This was
tripping some logic in the page fault handler which wouldn't allocate the page
if the faulting address was more that 32 bytes lower than the current stack
pointer.  Since a signal frame is greater than 32 bytes, this exercised that
case.

It's fixed by updating the SP in the pt_regs before starting to copy the
signal frame.  Since those are the registers that will be copied on to the
stack, we have to be careful to put the original SP, not the new one which
points to the signal frame, on the stack.

Signed-off-by: Jeff Dike <jdike@addtoit.com>
Cc: Paolo 'Blaisorblade' Giarrusso <blaisorblade@yahoo.it>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>

1 files changed, 44 insertions, 15 deletions

diff --git a/arch/um/sys-i386/signal.c b/arch/um/sys-i386/signal.c
index 7cd1a82..33a40f5 100644
--- a/arch/um/sys-i386/signal.c
+++ b/arch/um/sys-i386/signal.c
@@ -58,7 +58,7 @@ static int copy_sc_from_user_skas(struct pt_regs *regs,
 }
 
 int copy_sc_to_user_skas(struct sigcontext *to, struct _fpstate *to_fp,
-                         struct pt_regs *regs)
+                         struct pt_regs *regs, unsigned long sp)
 {
   	struct sigcontext sc;
 	unsigned long fpregs[HOST_FP_SIZE];
@@ -72,7 +72,7 @@ int copy_sc_to_user_skas(struct sigcontext *to, struct _fpstate *to_fp,
 	sc.edi = REGS_EDI(regs->regs.skas.regs);
 	sc.esi = REGS_ESI(regs->regs.skas.regs);
 	sc.ebp = REGS_EBP(regs->regs.skas.regs);
-	sc.esp = REGS_SP(regs->regs.skas.regs);
+	sc.esp = sp;
 	sc.ebx = REGS_EBX(regs->regs.skas.regs);
 	sc.edx = REGS_EDX(regs->regs.skas.regs);
 	sc.ecx = REGS_ECX(regs->regs.skas.regs);
@@ -132,7 +132,7 @@ int copy_sc_from_user_tt(struct sigcontext *to, struct sigcontext *from,
 }
 
 int copy_sc_to_user_tt(struct sigcontext *to, struct _fpstate *fp,
-		       struct sigcontext *from, int fpsize)
+		       struct sigcontext *from, int fpsize, unsigned long sp)
 {
 	struct _fpstate *to_fp, *from_fp;
 	int err;
@@ -140,11 +140,18 @@ int copy_sc_to_user_tt(struct sigcontext *to, struct _fpstate *fp,
 	to_fp =	(fp ? fp : (struct _fpstate *) (to + 1));
 	from_fp = from->fpstate;
 	err = copy_to_user(to, from, sizeof(*to));
+
+	/* The SP in the sigcontext is the updated one for the signal
+	 * delivery.  The sp passed in is the original, and this needs
+	 * to be restored, so we stick it in separately.
+	 */
+	err |= copy_to_user(&SC_SP(to), sp, sizeof(sp));
+
 	if(from_fp != NULL){
 		err |= copy_to_user(&to->fpstate, &to_fp, sizeof(to->fpstate));
 		err |= copy_to_user(to_fp, from_fp, fpsize);
 	}
-	return(err);
+	return err;
 }
 #endif
 
@@ -159,11 +166,11 @@ static int copy_sc_from_user(struct pt_regs *to, void __user *from)
 }
 
 static int copy_sc_to_user(struct sigcontext *to, struct _fpstate *fp,
-			   struct pt_regs *from)
+			   struct pt_regs *from, unsigned long sp)
 {
 	return(CHOOSE_MODE(copy_sc_to_user_tt(to, fp, UPT_SC(&from->regs),
-					      sizeof(*fp)),
-                           copy_sc_to_user_skas(to, fp, from)));
+					      sizeof(*fp), sp),
+                           copy_sc_to_user_skas(to, fp, from, sp)));
 }
 
 static int copy_ucontext_to_user(struct ucontext *uc, struct _fpstate *fp,
@@ -174,7 +181,7 @@ static int copy_ucontext_to_user(struct ucontext *uc, struct _fpstate *fp,
 	err |= put_user(current->sas_ss_sp, &uc->uc_stack.ss_sp);
 	err |= put_user(sas_ss_flags(sp), &uc->uc_stack.ss_flags);
 	err |= put_user(current->sas_ss_size, &uc->uc_stack.ss_size);
-	err |= copy_sc_to_user(&uc->uc_mcontext, fp, &current->thread.regs);
+	err |= copy_sc_to_user(&uc->uc_mcontext, fp, &current->thread.regs, sp);
 	err |= copy_to_user(&uc->uc_sigmask, set, sizeof(*set));
 	return(err);
 }
@@ -207,6 +214,7 @@ int setup_signal_stack_sc(unsigned long stack_top, int sig,
 {
 	struct sigframe __user *frame;
 	void *restorer;
+	unsigned long save_sp = PT_REGS_SP(regs);
 	int err = 0;
 
 	stack_top &= -8UL;
@@ -218,9 +226,19 @@ int setup_signal_stack_sc(unsigned long stack_top, int sig,
 	if(ka->sa.sa_flags & SA_RESTORER)
 		restorer = ka->sa.sa_restorer;
 
+	/* Update SP now because the page fault handler refuses to extend
+	 * the stack if the faulting address is too far below the current
+	 * SP, which frame now certainly is.  If there's an error, the original
+	 * value is restored on the way out.
+	 * When writing the sigcontext to the stack, we have to write the
+	 * original value, so that's passed to copy_sc_to_user, which does
+	 * the right thing with it.
+	 */
+	PT_REGS_SP(regs) = (unsigned long) frame;
+
 	err |= __put_user(restorer, &frame->pretcode);
 	err |= __put_user(sig, &frame->sig);
-	err |= copy_sc_to_user(&frame->sc, NULL, regs);
+	err |= copy_sc_to_user(&frame->sc, NULL, regs, save_sp);
 	err |= __put_user(mask->sig[0], &frame->sc.oldmask);
 	if (_NSIG_WORDS > 1)
 		err |= __copy_to_user(&frame->extramask, &mask->sig[1],
@@ -238,7 +256,7 @@ int setup_signal_stack_sc(unsigned long stack_top, int sig,
 	err |= __put_user(0x80cd, (short __user *)(frame->retcode+6));
 
 	if(err)
-		return(err);
+		goto err;
 
 	PT_REGS_SP(regs) = (unsigned long) frame;
 	PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler;
@@ -248,7 +266,11 @@ int setup_signal_stack_sc(unsigned long stack_top, int sig,
 
 	if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED))
 		ptrace_notify(SIGTRAP);
-	return(0);
+	return 0;
+
+err:
+	PT_REGS_SP(regs) = save_sp;
+	return err;
 }
 
 int setup_signal_stack_si(unsigned long stack_top, int sig,
@@ -257,6 +279,7 @@ int setup_signal_stack_si(unsigned long stack_top, int sig,
 {
 	struct rt_sigframe __user *frame;
 	void *restorer;
+	unsigned long save_sp = PT_REGS_SP(regs);
 	int err = 0;
 
 	stack_top &= -8UL;
@@ -268,13 +291,16 @@ int setup_signal_stack_si(unsigned long stack_top, int sig,
 	if(ka->sa.sa_flags & SA_RESTORER)
 		restorer = ka->sa.sa_restorer;
 
+	/* See comment above about why this is here */
+	PT_REGS_SP(regs) = (unsigned long) frame;
+
 	err |= __put_user(restorer, &frame->pretcode);
 	err |= __put_user(sig, &frame->sig);
 	err |= __put_user(&frame->info, &frame->pinfo);
 	err |= __put_user(&frame->uc, &frame->puc);
 	err |= copy_siginfo_to_user(&frame->info, info);
 	err |= copy_ucontext_to_user(&frame->uc, &frame->fpstate, mask,
-				     PT_REGS_SP(regs));
+				     save_sp);
 
 	/*
 	 * This is movl $,%eax ; int $0x80
@@ -288,9 +314,8 @@ int setup_signal_stack_si(unsigned long stack_top, int sig,
 	err |= __put_user(0x80cd, (short __user *)(frame->retcode+5));
 
 	if(err)
-		return(err);
+		goto err;
 
-	PT_REGS_SP(regs) = (unsigned long) frame;
 	PT_REGS_IP(regs) = (unsigned long) ka->sa.sa_handler;
 	PT_REGS_EAX(regs) = (unsigned long) sig;
 	PT_REGS_EDX(regs) = (unsigned long) &frame->info;
@@ -298,7 +323,11 @@ int setup_signal_stack_si(unsigned long stack_top, int sig,
 
 	if ((current->ptrace & PT_DTRACE) && (current->ptrace & PT_PTRACED))
 		ptrace_notify(SIGTRAP);
-	return(0);
+	return 0;
+
+err:
+	PT_REGS_SP(regs) = save_sp;
+	return err;
 }
 
 long sys_sigreturn(struct pt_regs regs)