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| author | Sebastian Ott <sebott@linux.vnet.ibm.com> | 2012-10-05 10:43:31 +0200 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2012-10-09 14:17:00 +0200 |
| commit | 4dcc2a4d6c37c36155ea6d6305f15e599531b862 (patch) | |
| tree | d597bfa9c7ca679688bcb22ee45f232a6fe1c16b /arch/s390 | |
| parent | s390/mm: let kernel text section always begin at 1MB (diff) | |
| download | linux-4dcc2a4d6c37c36155ea6d6305f15e599531b862.tar.xz linux-4dcc2a4d6c37c36155ea6d6305f15e599531b862.zip | |
s390/chsc: make headers usable
Make sure that exported headers are save to be included by userspace
exploiting /dev/chsc.
Reported-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
Signed-off-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
Diffstat (limited to 'arch/s390')
| -rw-r--r-- | arch/s390/include/asm/chpid.h | 10 | ||||
| -rw-r--r-- | arch/s390/include/asm/chsc.h | 10 |
2 files changed, 11 insertions, 9 deletions
diff --git a/arch/s390/include/asm/chpid.h b/arch/s390/include/asm/chpid.h index e5bde9f9291f..8af0b92c90c6 100644 --- a/arch/s390/include/asm/chpid.h +++ b/arch/s390/include/asm/chpid.h @@ -1,5 +1,5 @@ /* - * Copyright IBM Corp. 2007 + * Copyright IBM Corp. 2007, 2012 * Author(s): Peter Oberparleiter <peter.oberparleiter@de.ibm.com> */ @@ -12,10 +12,10 @@ #define __MAX_CHPID 255 struct chp_id { - u8 reserved1; - u8 cssid; - u8 reserved2; - u8 id; + __u8 reserved1; + __u8 cssid; + __u8 reserved2; + __u8 id; } __attribute__((packed)); #ifdef __KERNEL__ diff --git a/arch/s390/include/asm/chsc.h b/arch/s390/include/asm/chsc.h index aea451fd182e..1c6a7f85a581 100644 --- a/arch/s390/include/asm/chsc.h +++ b/arch/s390/include/asm/chsc.h @@ -1,7 +1,7 @@ /* * ioctl interface for /dev/chsc * - * Copyright IBM Corp. 2008 + * Copyright IBM Corp. 2008, 2012 * Author(s): Cornelia Huck <cornelia.huck@de.ibm.com> */ @@ -9,9 +9,12 @@ #define _ASM_CHSC_H #include <linux/types.h> +#include <linux/ioctl.h> #include <asm/chpid.h> #include <asm/schid.h> +#define CHSC_SIZE 0x1000 + struct chsc_async_header { __u16 length; __u16 code; @@ -23,15 +26,14 @@ struct chsc_async_header { struct chsc_async_area { struct chsc_async_header header; - __u8 data[PAGE_SIZE - 16 /* size of chsc_async_header */]; + __u8 data[CHSC_SIZE - sizeof(struct chsc_async_header)]; } __attribute__ ((packed)); - struct chsc_response_struct { __u16 length; __u16 code; __u32 parms; - __u8 data[PAGE_SIZE - 8]; + __u8 data[CHSC_SIZE - 2 * sizeof(__u16) - sizeof(__u32)]; } __attribute__ ((packed)); struct chsc_chp_cd { |