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| author | Peter Oberparleiter <oberpar@linux.vnet.ibm.com> | 2017-02-20 14:52:58 +0100 |
|---|---|---|
| committer | Martin Schwidefsky <schwidefsky@de.ibm.com> | 2017-02-23 10:06:38 +0100 |
| commit | 77759137248f34864a8f7a58bbcebfcf1047504a (patch) | |
| tree | fd5022c36a6d18ee5fa437c1e4cddb4c309f7683 | |
| parent | f50c0e6371c960ad3481daa4504b33a9de4e9d01 (diff) | |
| download | linux-77759137248f34864a8f7a58bbcebfcf1047504a.tar.bz2 | |
s390/chsc: Add exception handler for CHSC instruction
Prevent kernel crashes due to unhandled exceptions raised by the CHSC
instruction which may for example be triggered by invalid ioctl data.
Fixes: 64150adf89df ("s390/cio: Introduce generic synchronous CHSC IOCTL")
Cc: <stable@vger.kernel.org> # v3.11+
Signed-off-by: Peter Oberparleiter <oberpar@linux.vnet.ibm.com>
Reviewed-by: Sebastian Ott <sebott@linux.vnet.ibm.com>
Reviewed-by: Cornelia Huck <cornelia.huck@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
| -rw-r--r-- | drivers/s390/cio/ioasm.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/drivers/s390/cio/ioasm.c b/drivers/s390/cio/ioasm.c index 8225da619014..4182f60124da 100644 --- a/drivers/s390/cio/ioasm.c +++ b/drivers/s390/cio/ioasm.c @@ -165,13 +165,15 @@ int tpi(struct tpi_info *addr) int chsc(void *chsc_area) { typedef struct { char _[4096]; } addr_type; - int cc; + int cc = -EIO; asm volatile( " .insn rre,0xb25f0000,%2,0\n" - " ipm %0\n" + "0: ipm %0\n" " srl %0,28\n" - : "=d" (cc), "=m" (*(addr_type *) chsc_area) + "1:\n" + EX_TABLE(0b, 1b) + : "+d" (cc), "=m" (*(addr_type *) chsc_area) : "d" (chsc_area), "m" (*(addr_type *) chsc_area) : "cc"); trace_s390_cio_chsc(chsc_area, cc); |