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s390/monwriter: do not use stack buffers for hardware data

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With CONFIG_VMAP_STACK=y the stack is allocated from the vmalloc space.
Data structures passed to a hardware or a hypervisor interface that
requires V=R can not be allocated on the stack anymore.

Use kmalloc to get memory for the appldata_parameter_list and
appldata_product_id structures.

Reviewed-by: Gerald Schaefer <gerald.schaefer@de.ibm.com>
Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
This commit is contained in:
Martin Schwidefsky 2018-09-06 10:31:59 +02:00
parent 8ef9eda018
commit c0f07ff93b
1 changed files with 20 additions and 13 deletions
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33
drivers/s390/char/monwriter.c
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@ -58,24 +58,31 @@ struct mon_private {
static int monwrite_diag(struct monwrite_hdr *myhdr, char *buffer, int fcn)
{
struct appldata_parameter_list parm_list;
struct appldata_product_id id;
struct appldata_parameter_list *parm_list;
struct appldata_product_id *id;
int rc;
memcpy(id.prod_nr, "LNXAPPL", 7);
id.prod_fn = myhdr->applid;
id.record_nr = myhdr->record_num;
id.version_nr = myhdr->version;
id.release_nr = myhdr->release;
id.mod_lvl = myhdr->mod_level;
rc = appldata_asm(&parm_list, &id, fcn,
id = kmalloc(sizeof(*id), GFP_KERNEL);
parm_list = kmalloc(sizeof(*parm_list), GFP_KERNEL);
rc = -ENOMEM;
if (!id || !parm_list)
goto out;
memcpy(id->prod_nr, "LNXAPPL", 7);
id->prod_fn = myhdr->applid;
id->record_nr = myhdr->record_num;
id->version_nr = myhdr->version;
id->release_nr = myhdr->release;
id->mod_lvl = myhdr->mod_level;
rc = appldata_asm(parm_list, id, fcn,
(void *) buffer, myhdr->datalen);
if (rc <= 0)
return rc;
goto out;
pr_err("Writing monitor data failed with rc=%i\n", rc);
if (rc == 5)
return -EPERM;
return -EINVAL;
rc = (rc == 5) ? -EPERM : -EINVAL;
out:
kfree(id);
kfree(parm_list);
return rc;
}
static struct mon_buf *monwrite_find_hdr(struct mon_private *monpriv,