lkml.org 
[lkml]   [2022]   [Jan]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
From
SubjectRe: [PATCH v2] arm64: extable: fix load_unaligned_zeropad() reg indices
Date
On Tue, 25 Jan 2022 10:22:17 -0800, Evgenii Stepanov wrote:
> In ex_handler_load_unaligned_zeropad() we erroneously extract the data and
> addr register indices from ex->type rather than ex->data. As ex->type will
> contain EX_TYPE_LOAD_UNALIGNED_ZEROPAD (i.e. 4):
> * We'll always treat X0 as the address register, since EX_DATA_REG_ADDR is
> extracted from bits [9:5]. Thus, we may attempt to dereference an
> arbitrary address as X0 may hold an arbitrary value.
> * We'll always treat X4 as the data register, since EX_DATA_REG_DATA is
> extracted from bits [4:0]. Thus we will corrupt X4 and cause arbitrary
> behaviour within load_unaligned_zeropad() and its caller.
>
> [...]

Applied to arm64 (for-next/fixes), thanks!

[1/1] arm64: extable: fix load_unaligned_zeropad() reg indices
https://git.kernel.org/arm64/c/afa1bf69aac3

--
Catalin

\
 
 \ /
  Last update: 2022-01-26 19:58    [W:0.034 / U:0.340 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site