diff options
| author | Jiri Slaby <jslaby@suse.cz> | 2020-07-30 12:55:46 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-07-31 20:22:06 +0200 |
| commit | f3af1b68fc96b14b93d1013ce7965723dc53ebbc (patch) | |
| tree | 99802b547781d2caf80832a8062a36a0420d1ed3 /drivers/tty | |
| parent | 7df5081cbf5e1c342acd30850a483ef504519937 (diff) | |
| download | linux-f3af1b68fc96b14b93d1013ce7965723dc53ebbc.tar.bz2 | |
tty: keyboard, do not speculate on func_table index
It is very unlikely for processor to speculate on the func_table index.
The index is uchar and func_table is of size 256. So the compiler would
need to screw up and generate a really bad code.
But to stay on the safe side, forbid speculation on this user passed
index.
Signed-off-by: Jiri Slaby <jslaby@suse.cz>
Cc: Jiri Kosina <jikos@kernel.org>
Link: https://lore.kernel.org/r/20200730105546.24268-1-jslaby@suse.cz
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/tty')
| -rw-r--r-- | drivers/tty/vt/keyboard.c | 3 |
1 files changed, 2 insertions, 1 deletions
diff --git a/drivers/tty/vt/keyboard.c b/drivers/tty/vt/keyboard.c index 568b2171f335..a768069b0f9a 100644 --- a/drivers/tty/vt/keyboard.c +++ b/drivers/tty/vt/keyboard.c @@ -32,6 +32,7 @@ #include <linux/tty.h> #include <linux/tty_flip.h> #include <linux/mm.h> +#include <linux/nospec.h> #include <linux/string.h> #include <linux/init.h> #include <linux/slab.h> @@ -2019,7 +2020,7 @@ int vt_do_kdgkb_ioctl(int cmd, struct kbsentry __user *user_kdgkb, int perm) goto reterr; } kbs->kb_string[sizeof(kbs->kb_string)-1] = '\0'; - i = kbs->kb_func; + i = array_index_nospec(kbs->kb_func, MAX_NR_FUNC); switch (cmd) { case KDGKBSENT: |