From 02a017a9f37ae6842e065da919b5952eb847e869 Mon Sep 17 00:00:00 2001 From: David Mosberger-Tang Date: Tue, 10 May 2005 11:35:00 -0700 Subject: [PATCH] [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 Signed-off-by: Tony Luck --- arch/ia64/kernel/ptrace.c | 20 +++++++++++++++++--- 1 file 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; } -- 2.20.1