From 9088333e3d83a68aeac15f7810c3cbf332b80303 Mon Sep 17 00:00:00 2001 From: "David S. Miller" Date: Thu, 23 Sep 2010 22:06:47 -0700 Subject: [PATCH] sparc32: Fix unaligned stack handling on trap return. When the rett stack checking code sees the stack is unaligned (in both the sun4c and srmmu cases) it jumps to the window fault-in path. But that just tries to page the stack pages in, it doesn't do anything special if the stack is misaligned. Therefore we essentially just loop forever in the trap return path. Fix this by emitting a SIGILL in the stack fault-in code if the stack is mis-aligned. Reported-by: Al Viro Signed-off-by: David S. Miller --- arch/sparc/mm/fault_32.c | 12 ++++++++++++ 1 file changed, 12 insertions(+) diff --git a/arch/sparc/mm/fault_32.c b/arch/sparc/mm/fault_32.c index bd8601601afa..5b836f5aea90 100644 --- a/arch/sparc/mm/fault_32.c +++ b/arch/sparc/mm/fault_32.c @@ -539,6 +539,12 @@ static void force_user_fault(unsigned long address, int write) __do_fault_siginfo(BUS_ADRERR, SIGBUS, tsk->thread.kregs, address); } +static void check_stack_aligned(unsigned long sp) +{ + if (sp & 0x7UL) + force_sig(SIGILL, current); +} + void window_overflow_fault(void) { unsigned long sp; @@ -547,6 +553,8 @@ void window_overflow_fault(void) if(((sp + 0x38) & PAGE_MASK) != (sp & PAGE_MASK)) force_user_fault(sp + 0x38, 1); force_user_fault(sp, 1); + + check_stack_aligned(sp); } void window_underflow_fault(unsigned long sp) @@ -554,6 +562,8 @@ void window_underflow_fault(unsigned long sp) if(((sp + 0x38) & PAGE_MASK) != (sp & PAGE_MASK)) force_user_fault(sp + 0x38, 0); force_user_fault(sp, 0); + + check_stack_aligned(sp); } void window_ret_fault(struct pt_regs *regs) @@ -564,4 +574,6 @@ void window_ret_fault(struct pt_regs *regs) if(((sp + 0x38) & PAGE_MASK) != (sp & PAGE_MASK)) force_user_fault(sp + 0x38, 0); force_user_fault(sp, 0); + + check_stack_aligned(sp); }