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: 64150adf89
("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>
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@ -165,13 +165,15 @@ int tpi(struct tpi_info *addr)
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int chsc(void *chsc_area)
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{
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typedef struct { char _[4096]; } addr_type;
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int cc;
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int cc = -EIO;
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asm volatile(
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" .insn rre,0xb25f0000,%2,0\n"
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" ipm %0\n"
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"0: ipm %0\n"
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" srl %0,28\n"
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: "=d" (cc), "=m" (*(addr_type *) chsc_area)
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"1:\n"
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EX_TABLE(0b, 1b)
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: "+d" (cc), "=m" (*(addr_type *) chsc_area)
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: "d" (chsc_area), "m" (*(addr_type *) chsc_area)
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: "cc");
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trace_s390_cio_chsc(chsc_area, cc);
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