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scsi: 3w-9xxx: fix a missing-check bug

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[ Upstream commit c9318a3e02 ]

In twa_chrdev_ioctl(), the ioctl driver command is firstly copied from
the userspace pointer 'argp' and saved to the kernel object
'driver_command'.  Then a security check is performed on the data buffer
size indicated by 'driver_command', which is
'driver_command.buffer_length'. If the security check is passed, the
entire ioctl command is copied again from the 'argp' pointer and saved
to the kernel object 'tw_ioctl'. Then, various operations are performed
on 'tw_ioctl' according to the 'cmd'. Given that the 'argp' pointer
resides in userspace, a malicious userspace process can race to change
the buffer size between the two copies. This way, the user can bypass
the security check and inject invalid data buffer size. This can cause
potential security issues in the following execution.

This patch checks for capable(CAP_SYS_ADMIN) in twa_chrdev_open()t o
avoid the above issues.

Signed-off-by: Wenwen Wang <wang6495@umn.edu>
Acked-by: Adam Radford <aradford@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
Signed-off-by: Sasha Levin <alexander.levin@microsoft.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Wenwen Wang
2018-05-07 19:46:43 -05:00
committed by Greg Kroah-Hartman
parent 112f47373e
commit a0e86c016b
1 changed files with 5 additions and 0 deletions
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5
drivers/scsi/3w-9xxx.c
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@@ -886,6 +886,11 @@ static int twa_chrdev_open(struct inode *inode, struct file *file)
unsigned int minor_number;
int retval = TW_IOCTL_ERROR_OS_ENODEV;
if (!capable(CAP_SYS_ADMIN)) {
retval = -EACCES;
goto out;
}
minor_number = iminor(inode);
if (minor_number >= twa_device_extension_count)
goto out;