netdev - [BUG] net: rocker: accessing the data mapped to streaming DMA

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [day] [month] [year] [list]

Date:   Sun, 2 Aug 2020 22:26:16 +0800
From:   Jia-Ju Bai <baijiaju@...nghua.edu.cn>
To:     jiri@...nulli.us, davem@...emloft.net, kuba@...nel.org
Cc:     netdev@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: [BUG] net: rocker: accessing the data mapped to streaming DMA

In rocker_dma_test_offset(), "buf" is mapped to streaming DMA on line 203:
   dma_handle = pci_map_single(..., buf, ...);

Then, "buf" is accessed on line 229:
   expect[i] = ~buf[i];

This access may cause data inconsistency between CPU cache and hardware.

I am not sure how to properly fix this problem, and thus I only report it.


Best wishes,
Jia-Ju Bai