mirror/linux
1
0
Fork 0
mirror of https://github.com/torvalds/linux.git synced 2024-11-21 19:46:16 +00:00
Code Issues Actions Packages Projects Releases Wiki Activity

cdrom: Avoid barrier_nospec() in cdrom_ioctl_media_changed()

Browse Source 
The barrier_nospec() after the array bounds check is overkill and
painfully slow for arches which implement it.

Furthermore, most arches don't implement it, so they remain exposed to
Spectre v1 (which can affect pretty much any CPU with branch
prediction).

Instead, clamp the user pointer to a valid range so it's guaranteed to
be a valid array index even when the bounds check mispredicts.

Fixes: 8270cb10c0 ("cdrom: Fix spectre-v1 gadget")
Signed-off-by: Josh Poimboeuf <jpoimboe@kernel.org>
Link: https://lore.kernel.org/r/1d86f4d9d8fba68e5ca64cdeac2451b95a8bf872.1729202937.git.jpoimboe@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
This commit is contained in:
Josh Poimboeuf 2024-10-17 15:09:02 -07:00 committed by Jens Axboe
parent de7007e9e6
commit b0bf1afde7
1 changed files with 1 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

2
drivers/cdrom/cdrom.c
View File

@ -2313,7 +2313,7 @@ static int cdrom_ioctl_media_changed(struct cdrom_device_info *cdi,
return -EINVAL;
/* Prevent arg from speculatively bypassing the length check */
barrier_nospec();
arg = array_index_nospec(arg, cdi->capacity);
info = kmalloc(sizeof(*info), GFP_KERNEL);
if (!info)