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authorDavid Mosberger-Tang <davidm@hpl.hp.com>2005-05-10 11:35:00 -0700
committerTony Luck <tony.luck@intel.com>2005-05-17 12:33:15 -0700
commit02a017a9f37ae6842e065da919b5952eb847e869 (patch)
tree570c84abb8d8a23747a4ed51af3d9f574df0b93b /arch/ia64/kernel/ptrace.c
parentd0dac8082cbc2b234917ec53eb591b1ddbec80bb (diff)
downloadlinux-02a017a9f37ae6842e065da919b5952eb847e869.tar.bz2
[IA64] Correct convert_to_non_syscall()
convert_to_non_syscall() has the same problem that unwind_to_user() used to have. Fix it likewise. Signed-off-by: David Mosberger-Tang <davidm@hpl.hp.com> Signed-off-by: Tony Luck <tony.luck@intel.com>
Diffstat (limited to 'arch/ia64/kernel/ptrace.c')
-rw-r--r--arch/ia64/kernel/ptrace.c20
1 files changed, 17 insertions, 3 deletions
diff --git a/arch/ia64/kernel/ptrace.c b/arch/ia64/kernel/ptrace.c
index 907464ee7273..08c8a5eb25ab 100644
--- a/arch/ia64/kernel/ptrace.c
+++ b/arch/ia64/kernel/ptrace.c
@@ -692,16 +692,30 @@ convert_to_non_syscall (struct task_struct *child, struct pt_regs *pt,
unsigned long cfm)
{
struct unw_frame_info info, prev_info;
- unsigned long ip, pr;
+ unsigned long ip, sp, pr;
unw_init_from_blocked_task(&info, child);
while (1) {
prev_info = info;
if (unw_unwind(&info) < 0)
return;
- if (unw_get_rp(&info, &ip) < 0)
+
+ unw_get_sp(&info, &sp);
+ if ((long)((unsigned long)child + IA64_STK_OFFSET - sp)
+ < IA64_PT_REGS_SIZE) {
+ dprintk("ptrace.%s: ran off the top of the kernel "
+ "stack\n", __FUNCTION__);
+ return;
+ }
+ if (unw_get_pr (&prev_info, &pr) < 0) {
+ unw_get_rp(&prev_info, &ip);
+ dprintk("ptrace.%s: failed to read "
+ "predicate register (ip=0x%lx)\n",
+ __FUNCTION__, ip);
return;
- if (ip < FIXADDR_USER_END)
+ }
+ if (unw_is_intr_frame(&info)
+ && (pr & (1UL << PRED_USER_STACK)))
break;
}