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authorMatthew Chapman <matthewc@hp.com>2005-06-20 20:53:01 -0700
committerChris Wright <chrisw@osdl.org>2005-06-22 12:32:50 -0700
commitdf0112ae92e768bda81105cff85d7c8e46004d7b (patch)
tree98f262f17071a9ab1d1fa1ffa42085faaffb6b12
parentfe3d5c8793fcaf33c5d3118a7f3ffc135eadaf4d (diff)
[PATCH] ia64 ptrace + sigrestore_context (CAN-2005-1761)
This patch fixes handling of accesses to ar.rsc via ptrace & restore_sigcontext Signed-off-by: Matthew Chapman <matthewc@hp.com> Acked-by: David Mosberger <davidm@hpl.hp.com> Acked-by: Tony Luck <tony.luck@intel.com> Signed-off-by: Chris Wright <chrisw@osdl.org>
-rw-r--r--arch/ia64/kernel/ptrace.c15
-rw-r--r--arch/ia64/kernel/signal.c5
2 files changed, 13 insertions, 7 deletions
diff --git a/arch/ia64/kernel/ptrace.c b/arch/ia64/kernel/ptrace.c
index 575a8f657b31..6d57aebad485 100644
--- a/arch/ia64/kernel/ptrace.c
+++ b/arch/ia64/kernel/ptrace.c
@@ -945,6 +945,13 @@ access_uarea (struct task_struct *child, unsigned long addr,
*data = (pt->cr_ipsr & IPSR_MASK);
return 0;
+ case PT_AR_RSC:
+ if (write_access)
+ pt->ar_rsc = *data | (3 << 2); /* force PL3 */
+ else
+ *data = pt->ar_rsc;
+ return 0;
+
case PT_AR_RNAT:
urbs_end = ia64_get_user_rbs_end(child, pt, NULL);
rnat_addr = (long) ia64_rse_rnat_addr((long *)
@@ -996,9 +1003,6 @@ access_uarea (struct task_struct *child, unsigned long addr,
case PT_AR_BSPSTORE:
ptr = pt_reg_addr(pt, ar_bspstore);
break;
- case PT_AR_RSC:
- ptr = pt_reg_addr(pt, ar_rsc);
- break;
case PT_AR_UNAT:
ptr = pt_reg_addr(pt, ar_unat);
break;
@@ -1234,7 +1238,7 @@ ptrace_getregs (struct task_struct *child, struct pt_all_user_regs __user *ppr)
static long
ptrace_setregs (struct task_struct *child, struct pt_all_user_regs __user *ppr)
{
- unsigned long psr, ec, lc, rnat, bsp, cfm, nat_bits, val = 0;
+ unsigned long psr, rsc, ec, lc, rnat, bsp, cfm, nat_bits, val = 0;
struct unw_frame_info info;
struct switch_stack *sw;
struct ia64_fpreg fpval;
@@ -1267,7 +1271,7 @@ ptrace_setregs (struct task_struct *child, struct pt_all_user_regs __user *ppr)
/* app regs */
retval |= __get_user(pt->ar_pfs, &ppr->ar[PT_AUR_PFS]);
- retval |= __get_user(pt->ar_rsc, &ppr->ar[PT_AUR_RSC]);
+ retval |= __get_user(rsc, &ppr->ar[PT_AUR_RSC]);
retval |= __get_user(pt->ar_bspstore, &ppr->ar[PT_AUR_BSPSTORE]);
retval |= __get_user(pt->ar_unat, &ppr->ar[PT_AUR_UNAT]);
retval |= __get_user(pt->ar_ccv, &ppr->ar[PT_AUR_CCV]);
@@ -1365,6 +1369,7 @@ ptrace_setregs (struct task_struct *child, struct pt_all_user_regs __user *ppr)
retval |= __get_user(nat_bits, &ppr->nat);
retval |= access_uarea(child, PT_CR_IPSR, &psr, 1);
+ retval |= access_uarea(child, PT_AR_RSC, &rsc, 1);
retval |= access_uarea(child, PT_AR_EC, &ec, 1);
retval |= access_uarea(child, PT_AR_LC, &lc, 1);
retval |= access_uarea(child, PT_AR_RNAT, &rnat, 1);
diff --git a/arch/ia64/kernel/signal.c b/arch/ia64/kernel/signal.c
index 499b7e5317cf..edd9f07860b2 100644
--- a/arch/ia64/kernel/signal.c
+++ b/arch/ia64/kernel/signal.c
@@ -94,7 +94,7 @@ sys_sigaltstack (const stack_t __user *uss, stack_t __user *uoss, long arg2,
static long
restore_sigcontext (struct sigcontext __user *sc, struct sigscratch *scr)
{
- unsigned long ip, flags, nat, um, cfm;
+ unsigned long ip, flags, nat, um, cfm, rsc;
long err;
/* Always make any pending restarted system calls return -EINTR */
@@ -106,7 +106,7 @@ restore_sigcontext (struct sigcontext __user *sc, struct sigscratch *scr)
err |= __get_user(ip, &sc->sc_ip); /* instruction pointer */
err |= __get_user(cfm, &sc->sc_cfm);
err |= __get_user(um, &sc->sc_um); /* user mask */
- err |= __get_user(scr->pt.ar_rsc, &sc->sc_ar_rsc);
+ err |= __get_user(rsc, &sc->sc_ar_rsc);
err |= __get_user(scr->pt.ar_unat, &sc->sc_ar_unat);
err |= __get_user(scr->pt.ar_fpsr, &sc->sc_ar_fpsr);
err |= __get_user(scr->pt.ar_pfs, &sc->sc_ar_pfs);
@@ -119,6 +119,7 @@ restore_sigcontext (struct sigcontext __user *sc, struct sigscratch *scr)
err |= __copy_from_user(&scr->pt.r15, &sc->sc_gr[15], 8); /* r15 */
scr->pt.cr_ifs = cfm | (1UL << 63);
+ scr->pt.ar_rsc = rsc | (3 << 2); /* force PL3 */
/* establish new instruction pointer: */
scr->pt.cr_iip = ip & ~0x3UL;