The patch titled
floppy: Add an extra bound check on ioctl arguments
has been added to the -mm tree. Its filename is
floppy-add-an-extra-bound-check-on-ioctl-arguments.patch
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------------------------------------------------------
Subject: floppy: Add an extra bound check on ioctl arguments
From: Arjan van de Ven <arjan@xxxxxxxxxxxxx>
gcc is not convinced that the floppy.c ioctl has sufficient bound checks,
and frankly, as a human I have a hard time proving the same more or less
(the size comes from the ioctl argument. humpf. maybe. the code isn't
very nice)
This patch adds an explicit check to make 100% sure it's safe, better than
finding out later that there indeed was a gap.
Signed-off-by: Arjan van de Ven <arjan@xxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
drivers/block/floppy.c | 3 +++
1 file changed, 3 insertions(+)
diff -puN drivers/block/floppy.c~floppy-add-an-extra-bound-check-on-ioctl-arguments drivers/block/floppy.c
--- a/drivers/block/floppy.c~floppy-add-an-extra-bound-check-on-ioctl-arguments
+++ a/drivers/block/floppy.c
@@ -3497,6 +3497,9 @@ static int fd_ioctl(struct block_device
((cmd & 0x80) && !capable(CAP_SYS_ADMIN)))
return -EPERM;
+ if (size < 0 || size > sizeof(inparam))
+ return -EINVAL;
+
/* copyin */
CLEARSTRUCT(&inparam);
if (_IOC_DIR(cmd) & _IOC_WRITE)
_
Patches currently in -mm which might be from arjan@xxxxxxxxxxxxx are
floppy-add-an-extra-bound-check-on-ioctl-arguments.patch
floppy-add-an-extra-bound-check-on-ioctl-arguments-fix.patch
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