s390/ptrace: fix PSW mask check

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commit dab6cf55f8 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 <schwidefsky@de.ibm.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

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Martin Schwidefsky 2014-06-23 15:29:40 +02:00 • committed by Greg Kroah-Hartman

parent d073bb2590

commit 1967b156fd

1 changed files with 10 additions and 2 deletions

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arch/s390/kernel/ptrace.c

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