From: Dmitry Torokhov dmitry.torokhov@gmail.com

stable inclusion from stable-v4.19.322 commit 9c6d189f0c1c59ba9a32326ec82a0b367a3cd47b category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/IARX6S CVE: CVE-2024-46745

Reference: https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git/commit/?id=...

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[ Upstream commit 206f533a0a7c683982af473079c4111f4a0f9f5e ]

From: Dmitry Torokhov dmitry.torokhov@gmail.com

When exercising uinput interface syzkaller may try setting up device with a really large number of slots, which causes memory allocation failure in input_mt_init_slots(). While this allocation failure is handled properly and request is rejected, it results in syzkaller reports. Additionally, such request may put undue burden on the system which will try to free a lot of memory for a bogus request.

Fix it by limiting allowed number of slots to 100. This can easily be extended if we see devices that can track more than 100 contacts.

Reported-by: Tetsuo Handa penguin-kernel@I-love.SAKURA.ne.jp Reported-by: syzbot syzbot+0122fa359a69694395d5@syzkaller.appspotmail.com Closes: https://syzkaller.appspot.com/bug?extid=0122fa359a69694395d5 Link: https://lore.kernel.org/r/Zqgi7NYEbpRsJfa2@google.com Signed-off-by: Dmitry Torokhov dmitry.torokhov@gmail.com Signed-off-by: Sasha Levin sashal@kernel.org Signed-off-by: Pu Lehui pulehui@huawei.com --- drivers/input/misc/uinput.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+)

diff --git a/drivers/input/misc/uinput.c b/drivers/input/misc/uinput.c index 83d1499fe021..845e3632f8aa 100644 --- a/drivers/input/misc/uinput.c +++ b/drivers/input/misc/uinput.c @@ -425,6 +425,20 @@ static int uinput_validate_absinfo(struct input_dev *dev, unsigned int code, return -EINVAL; }

+ /* + * Limit number of contacts to a reasonable value (100). This + * ensures that we need less than 2 pages for struct input_mt + * (we are not using in-kernel slot assignment so not going to + * allocate memory for the "red" table), and we should have no + * trouble getting this much memory. + */ + if (code == ABS_MT_SLOT && max > 99) { + printk(KERN_DEBUG + "%s: unreasonably large number of slots requested: %d\n", + UINPUT_NAME, max); + return -EINVAL; + } + return 0; }