From f3af1b68fc96b14b93d1013ce7965723dc53ebbc Mon Sep 17 00:00:00 2001 From: Jiri Slaby Date: Thu, 30 Jul 2020 12:55:46 +0200 Subject: 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 Cc: Jiri Kosina Link: https://lore.kernel.org/r/20200730105546.24268-1-jslaby@suse.cz Signed-off-by: Greg Kroah-Hartman --- drivers/tty/vt/keyboard.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'drivers/tty') 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 #include #include +#include #include #include #include @@ -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: -- cgit v1.2.3