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[PATCH] ide: add sanity checking to ide taskfile ioctl

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Without this the user can feed in bogus values and get very bogus
results. Security impact is minimal as this ioctl isn't available to
unpriviledged processes anyway.

Reported to the l/k list and found with an auditing tool.

Signed-off-by: Alan Cox <alan@redhat.com>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Alan Cox 2006-10-16 16:31:02 +01:00 committed by Linus Torvalds
parent 9d90dafdb1
commit 3a42bb223f
1 changed files with 9 additions and 4 deletions
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13
drivers/ide/ide-taskfile.c
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@ -524,8 +524,8 @@ int ide_taskfile_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
task_ioreg_t *hobsptr = args.hobRegister;
int err = 0;
int tasksize = sizeof(struct ide_task_request_s);
int taskin = 0;
int taskout = 0;
unsigned int taskin = 0;
unsigned int taskout = 0;
u8 io_32bit = drive->io_32bit;
char __user *buf = (char __user *)arg;
@ -538,8 +538,13 @@ int ide_taskfile_ioctl (ide_drive_t *drive, unsigned int cmd, unsigned long arg)
return -EFAULT;
}
taskout = (int) req_task->out_size;
taskin = (int) req_task->in_size;
taskout = req_task->out_size;
taskin = req_task->in_size;
if (taskin > 65536 || taskout > 65536) {
err = -EINVAL;
goto abort;
}
if (taskout) {
int outtotal = tasksize;