tree 9c84511dee1084d9ee15a5e667289017e182010d
parent 7436127ce9042f95a10bb5423f726fd63a61934d
author Catalin Marinas <catalin.marinas@arm.com> 1245426131 +0100
committer Russell King <rmk+kernel@arm.linux.org.uk> 1245426262 +0100

[ARM] 5558/1: Add extra checks to ARM unwinder to avoid tracing corrupt stacks

There are situations where the unwinder goes beyond stack boundaries and
unwinds random data. This patch moves the stack boundaries check after
the unwind_exec_insn() call and adds an extra check for possible
infinite loops (like "mov pc, lr" with pc == lr).

The patch also fixes a bug in the unwind instructions interpreter. The
0xb0 instruction can only set PC to LR if this wasn't already set by
a previous instruction (this is used on exceptions taken while in kernel
mode where svc_entry is annotated with ".save {r0 - pc}").

Tested-by: Tony Lindgren <tony@atomide.com>

Signed-off-by: Catalin Marinas <catalin.marinas@arm.com>
Signed-off-by: Russell King <rmk+kernel@arm.linux.org.uk>