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s390/ptrace: fix storage key handling

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The key member of the runtime instrumentation control block contains
only the access key, not the complete storage key. Therefore the value
must be shifted by four bits. Since existing user space does not
necessarily query and set the access key correctly, just ignore the
user space provided key and use the correct one.
Note: this is only relevant for debugging purposes in case somebody
compiles a kernel with a default storage access key set to a value not
equal to zero.

Fixes: 262832bc5a ("s390/ptrace: add runtime instrumention register get/set")
Reported-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Signed-off-by: Heiko Carstens <hca@linux.ibm.com>
This commit is contained in:
Heiko Carstens 2020-08-12 18:56:28 +02:00
parent 9eaba29c79
commit fd78c59446
1 changed files with 5 additions and 2 deletions
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7
arch/s390/kernel/ptrace.c
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@ -1268,7 +1268,6 @@ static bool is_ri_cb_valid(struct runtime_instr_cb *cb)
cb->pc == 1 &&
cb->qc == 0 &&
cb->reserved2 == 0 &&
cb->key == PAGE_DEFAULT_KEY &&
cb->reserved3 == 0 &&
cb->reserved4 == 0 &&
cb->reserved5 == 0 &&
@ -1330,7 +1329,11 @@ static int s390_runtime_instr_set(struct task_struct *target,
kfree(data);
return -EINVAL;
}
/*
* Override access key in any case, since user space should
* not be able to set it, nor should it care about it.
*/
ri_cb.key = PAGE_DEFAULT_KEY >> 4;
preempt_disable();
if (!target->thread.ri_cb)
target->thread.ri_cb = data;