Hi,
On 7/14/20 10:27 AM, Andy Shevchenko wrote:
On Tue, Jul 14, 2020 at 11:21 AM Andy Shevchenko
<andy.shevchenko@xxxxxxxxx> wrote:
On Tue, Jul 14, 2020 at 11:15 AM Hans de Goede <hdegoede@xxxxxxxxxx> wrote:
Commit 35d13c7a0512 ("platform/x86: thinkpad_acpi: Use strndup_user()
in dispatch_proc_write()") cleaned up dispatch_proc_write() by replacing
the code to copy the passed in data from userspae with strndup_user().
user space
Ack, do you want me to send a v2, or can you fix this up after applying.
But strndup_user() expects a 0 terminated input buffer and the buffer
passed to dispatch_proc_write() is NOT 0 terminated.
Second though, perhaps it's a simple wrong count parameter?
strndup_user(..., min(count, PAGE_SIZE)) or so would work?
I honestly have not looked at a better fix and given that you've just come
up with 2 suggestions which may or may not work, combined with
where we are in the 5.8 cycle I believe it would be best to just
play it safe and go with the revert for 5.8.
If you then take a second attempt at cleaning this up for 5.9 and
send it to me, I can test it for you.
Regards,
Hans
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