linux-kernel - [PATCH] kgdb: could not write to the last of valid memory with kgdb.

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 linux-cve-announce PHC
Open Source and information security mailing list archives

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

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

Message-ID: <48C5BDA0.90105@tripeaks.co.jp>
Date:	Tue, 09 Sep 2008 09:04:48 +0900
From:	Atsuo Igarashi <atsuo_igarashi@...peaks.co.jp>
To:	jason.wessel@...driver.com
CC:	linux-kernel@...r.kernel.org,
	Atsuo Igarashi <atsuo_igarashi@...peaks.co.jp>,
	Yoichi Yuasa <yoichi_yuasa@...peaks.co.jp>
Subject: [PATCH] kgdb: could not write to the last of valid memory with kgdb.

Hi,

I'm using i.MX31 ARM11 board which has 104Mbyte valid memory.
When I'd invoked a print command to write the last of valid memory from gdb,
there was no response from kgdb.

It seems that the following line causes this problem.

kernel/kgdb.c: write_mem_msg()
...
 491 			flush_icache_range(addr, addr + length + 1);

If the last byte of valid memory is specified, the last cache line and the next
cache line will be flushed by the ARM11 V6's function from flush_icache_range().
I'm not sure why the 2nd parameter has +1, I assume this +1 is unnecessary for
ARM11 V6's cache.
I send a patch to remove this +1, does anyone know necessity for other architectures?

Regards,

Signed-off-by Atsuo Igarashi <atsuo_igarashi@...peaks.co.jp>

View attachment "kgdb_write_mem_msg.diff" of type "text/x-diff" (416 bytes)