Commit 52898025 authored by Nigel Hislop's avatar Nigel Hislop Committed by Martin Schwidefsky
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[S390] dasd: security and PSF update patch for EMC CKD ioctl

Remove the PSF order/suborder check from the Symmetrix CKD dasd ioctl.
In exchange restrict the ioctl to CAP_SYS_ADMIN and CAP_SYS_RAWIO.
Signed-off-by: default avatarNigel Hislop <>
Signed-off-by: default avatarMartin Schwidefsky <>
parent 91a970d9
......@@ -2839,8 +2839,13 @@ static int dasd_symm_io(struct dasd_device *device, void __user *argp)
char *psf_data, *rssd_result;
struct dasd_ccw_req *cqr;
struct ccw1 *ccw;
char psf0, psf1;
int rc;
if (!capable(CAP_SYS_ADMIN) && !capable(CAP_SYS_RAWIO))
return -EACCES;
psf0 = psf1 = 0;
/* Copy parms from caller */
rc = -EFAULT;
if (copy_from_user(&usrparm, argp, sizeof(usrparm)))
......@@ -2869,12 +2874,8 @@ static int dasd_symm_io(struct dasd_device *device, void __user *argp)
(void __user *)(unsigned long) usrparm.psf_data,
goto out_free;
/* sanity check on syscall header */
if (psf_data[0] != 0x17 && psf_data[1] != 0xce) {
rc = -EINVAL;
goto out_free;
psf0 = psf_data[0];
psf1 = psf_data[1];
/* setup CCWs for PSF + RSSD */
cqr = dasd_smalloc_request(DASD_ECKD_MAGIC, 2 , 0, device);
......@@ -2925,7 +2926,9 @@ out_free:
DBF_DEV_EVENT(DBF_WARNING, device, "Symmetrix ioctl: rc=%d", rc);
"Symmetrix ioctl (0x%02x 0x%02x): rc=%d",
(int) psf0, (int) psf1, rc);
return rc;
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