linux-kernel - Re: [PATCH] x86: copy srat table and unmap in acpi_parse

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

Date:	Thu, 17 Jan 2008 14:09:56 -0800
From:	Yinghai Lu <Yinghai.Lu@....COM>
To:	Ingo Molnar <mingo@...e.hu>
Cc:	LKML <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH] x86: copy srat table and unmap in acpi_parse_table

On Thursday 17 January 2008 12:43:43 pm Ingo Molnar wrote:
> 
> * Yinghai Lu <Yinghai.Lu@....COM> wrote:
> 
> > [PATCH] x86: copy srat table and unmap in acpi_parse_table
> > 
> > 
> > the old acpi_numa_slit_init was saving old address in early stage 
> > acpi_slit and acpi_parse_table can not unmap address that. the patch 
> > copy the slit in the callback, so we could unmap table in 
> > acpi_parse_table instead of outside track it.
> > 
> > need to revert
> > "
> > commit d8d28f25f33c6a035cdfb1d421c79293d16e5c58
> > Author: Ingo Molnar <mingo@...e.hu>
> > Date:   Thu Jan 17 15:26:42 2008 +0100
> > 
> >     x86: ACPI: fix mapping leaks
> > 
> >     ioremap_early() is stateful, hence we cannot tolerate mapping leaks.
> > "
> > 
> > before appling this patch
> 
> do you mean your patch should be applied first, then the 
> d8d28f25f33c6a03 patch should applied as second?

d8d28f25f33c6a03  is not needed

> 
> Or if d8d28f25f33c6a03 really needs to be reverted to get your system to 
> boot properly, which particular bit of it was causing trouble for you? 
> (or the whole thing?)

we need to call acpi_os_unmap_memory in acpi_table_parse or just after it.

call it in acpi_table_parse is much cleaner

the problem is that acpi_numa_slit_init do bad assumaption that it still can use address after it's callback function.
so we need to copy the slit.

YH
--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/