3.10-stable review patch. If anyone has any objections, please let me know.
------------------
From: Martin Schwidefsky <schwidef...@de.ibm.com>
commit dab6cf55f81a6e16b8147aed9a843e1691dcd318 upstream.
The PSW mask check of the PTRACE_POKEUSR_AREA command is incorrect.
The PSW_MASK_USER define contains the PSW_MASK_ASC bits, the ptrace
interface accepts all combinations for the address-space-control
bits. To protect the kernel space the PSW mask check in ptrace needs
to reject the address-space-control bit combination for home space.
Fixes CVE-2014-3534
Signed-off-by: Martin Schwidefsky <schwidef...@de.ibm.com>
Cc: Ben Hutchings <b...@decadent.org.uk>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/s390/kernel/ptrace.c | 9 +++++++--
1 file changed, 7 insertions(+), 2 deletions(-)
--- a/arch/s390/kernel/ptrace.c
+++ b/arch/s390/kernel/ptrace.c
@@ -314,7 +314,9 @@ static int __poke_user(struct task_struc
* psw and gprs are stored on the stack
*/
if (addr == (addr_t) &dummy->regs.psw.mask &&
- ((data & ~PSW_MASK_USER) != psw_user_bits ||
+ (((data^psw_user_bits) & ~PSW_MASK_USER) ||
+ (((data^psw_user_bits) & PSW_MASK_ASC) &&
+ ((data|psw_user_bits) & PSW_MASK_ASC) == PSW_MASK_ASC) ||
((data & PSW_MASK_EA) && !(data & PSW_MASK_BA))))
/* Invalid psw mask. */
return -EINVAL;
@@ -627,7 +629,10 @@ static int __poke_user_compat(struct tas
*/
if (addr == (addr_t) &dummy32->regs.psw.mask) {
/* Build a 64 bit psw mask from 31 bit mask. */
- if ((tmp & ~PSW32_MASK_USER) != psw32_user_bits)
+ if (((tmp^psw32_user_bits) & ~PSW32_MASK_USER) ||
+ (((tmp^psw32_user_bits) & PSW32_MASK_ASC) &&
+ ((tmp|psw32_user_bits) & PSW32_MASK_ASC)
+ == PSW32_MASK_ASC))
/* Invalid psw mask. */
return -EINVAL;
regs->psw.mask = (regs->psw.mask & ~PSW_MASK_USER) |
--
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