| 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
| ||
|
Message-Id: <201011271558.14786.linux@rainbow-software.org>
Date: Sat, 27 Nov 2010 15:58:08 +0100
From: Ondrej Zary <linux@...nbow-software.org>
To: "Rafael J. Wysocki" <rjw@...k.pl>
Cc: Hugh Dickins <hughd@...gle.com>,
Andrew Morton <akpm@...ux-foundation.org>,
KAMEZAWA Hiroyuki <kamezawa.hiroyu@...fujitsu.com>,
KOSAKI Motohiro <kosaki.motohiro@...fujitsu.com>,
Kernel development list <linux-kernel@...r.kernel.org>,
Balbir Singh <balbir@...ibm.com>
Subject: Re: 2.6.35.5: hibernation broken... AGAIN
On Saturday 27 November 2010 00:10:04 Rafael J. Wysocki wrote:
> On Friday, November 26, 2010, Ondrej Zary wrote:
> > On Thursday 18 November 2010, Hugh Dickins wrote:
> > > On Wed, 17 Nov 2010, Ondrej Zary wrote:
> > > > On Wednesday 17 November 2010 22:12:01 Rafael J. Wysocki wrote:
> > > > > On Wednesday, November 17, 2010, Andrew Morton wrote:
> > > > > > On Wed, 17 Nov 2010 21:53:52 +0100
> > > > > >
> > > > > > "Rafael J. Wysocki" <rjw@...k.pl> wrote:
> > > > > > > On Wednesday, November 17, 2010, Ondrej Zary wrote:
> > > > > > > > Hello,
> > > > > > > > the nasty memory-corrupting hibernation bug
> > > > > > > > https://bugzilla.kernel.org/show_bug.cgi?id=15753 is back
> > > > > > > > since 2.6.35.5. 2.6.35.4 works fine, 2.6.35.5 crashes after
> > > > > > > > two days.
> > >
> > > That's distressing, for both and all of us: I'm sorry.
> > >
> > > > > > > > It seems to be caused by
> > > > > > > > b77c254d8d66e5e9aa81239fedba9f3d568097d9.
> > > > > >
> > > > > > commit b77c254d8d66e5e9aa81239fedba9f3d568097d9
> > > > > > Author: Hugh Dickins <hughd@...gle.com>
> > > > > > Date: Thu Sep 9 16:38:09 2010 -0700
> > > > > >
> > > > > > swap: prevent reuse during hibernation
> > >
> > > Embarrassing: I suspect that I've been confused, not for the first
> > > time, by the fork-like nature of hibernation and its images.
> > > I wonder if this patch below fixes it, Ondrej?
> > >
> > > (And is it kernel swsusp or user swsusp that you're using? May not
> > > matter at all, but will help us to think more clearly about it,
> > > if the corruption remains after this patch.)
> > >
> > > Rafael, do you agree that this patch was actually required even for
> > > your original commit 452aa6999e6703ffbddd7f6ea124d3968915f3e3
> > > mm/pm: force GFP_NOIO during suspend/hibernation and resume?
> > >
> > > Or am I still just as confused? Or if not, are there more forking
> > > places which require a similar patch?
> > >
> > > Not signing it off yet,
> > > Hugh
> >
> > Could you please do that? The patch fixes the problem.
>
> Can you check if the problem is also fixed by the patch below, please?
The patch does not apply to 2.6.35.4, 2.6.35.5 and also 2.6.36. What version
should I test?
> Rafael
>
> ---
> kernel/power/hibernate.c | 36 ++++++++++++++++++++++++++----------
> kernel/power/power.h | 1 +
> kernel/power/user.c | 1 +
> 3 files changed, 28 insertions(+), 10 deletions(-)
>
> Index: linux-2.6/kernel/power/hibernate.c
> ===================================================================
> --- linux-2.6.orig/kernel/power/hibernate.c
> +++ linux-2.6/kernel/power/hibernate.c
> @@ -29,6 +29,21 @@
> #include "power.h"
>
>
> +static gfp_t saved_gfp_mask;
> +
> +static void hibernate_restrict_gfp_mask(void)
> +{
> + saved_gfp_mask = clear_gfp_allowed_mask(GFP_IOFS);
> +}
> +
> +void hibernate_restore_gfp_mask(void)
> +{
> + if (saved_gfp_mask) {
> + set_gfp_allowed_mask(saved_gfp_mask);
> + saved_gfp_mask = 0;
> + }
> +}
> +
> static int nocompress = 0;
> static int noresume = 0;
> static char resume_file[256] = CONFIG_PM_STD_PARTITION;
> @@ -327,7 +342,6 @@ static int create_image(int platform_mod
> int hibernation_snapshot(int platform_mode)
> {
> int error;
> - gfp_t saved_mask;
>
> error = platform_begin(platform_mode);
> if (error)
> @@ -339,7 +353,7 @@ int hibernation_snapshot(int platform_mo
> goto Close;
>
> suspend_console();
> - saved_mask = clear_gfp_allowed_mask(GFP_IOFS);
> + hibernate_restrict_gfp_mask();
> error = dpm_suspend_start(PMSG_FREEZE);
> if (error)
> goto Recover_platform;
> @@ -348,7 +362,10 @@ int hibernation_snapshot(int platform_mo
> goto Recover_platform;
>
> error = create_image(platform_mode);
> - /* Control returns here after successful restore */
> + /*
> + * Control returns here (1) after the image has been created or the
> + * image creation has failed and (2) after a successful restore.
> + */
>
> Resume_devices:
> /* We may need to release the preallocated image pages here. */
> @@ -357,7 +374,10 @@ int hibernation_snapshot(int platform_mo
>
> dpm_resume_end(in_suspend ?
> (error ? PMSG_RECOVER : PMSG_THAW) : PMSG_RESTORE);
> - set_gfp_allowed_mask(saved_mask);
> +
> + if (error || !in_suspend)
> + hibernate_restore_gfp_mask();
> +
> resume_console();
> Close:
> platform_end(platform_mode);
> @@ -452,17 +472,16 @@ static int resume_target_kernel(bool pla
> int hibernation_restore(int platform_mode)
> {
> int error;
> - gfp_t saved_mask;
>
> pm_prepare_console();
> suspend_console();
> - saved_mask = clear_gfp_allowed_mask(GFP_IOFS);
> + hibernate_restrict_gfp_mask();
> error = dpm_suspend_start(PMSG_QUIESCE);
> if (!error) {
> error = resume_target_kernel(platform_mode);
> dpm_resume_end(PMSG_RECOVER);
> }
> - set_gfp_allowed_mask(saved_mask);
> + hibernate_restore_gfp_mask();
> resume_console();
> pm_restore_console();
> return error;
> @@ -476,7 +495,6 @@ int hibernation_restore(int platform_mod
> int hibernation_platform_enter(void)
> {
> int error;
> - gfp_t saved_mask;
>
> if (!hibernation_ops)
> return -ENOSYS;
> @@ -492,7 +510,6 @@ int hibernation_platform_enter(void)
>
> entering_platform_hibernation = true;
> suspend_console();
> - saved_mask = clear_gfp_allowed_mask(GFP_IOFS);
> error = dpm_suspend_start(PMSG_HIBERNATE);
> if (error) {
> if (hibernation_ops->recover)
> @@ -536,7 +553,6 @@ int hibernation_platform_enter(void)
> Resume_devices:
> entering_platform_hibernation = false;
> dpm_resume_end(PMSG_RESTORE);
> - set_gfp_allowed_mask(saved_mask);
> resume_console();
>
> Close:
> Index: linux-2.6/kernel/power/power.h
> ===================================================================
> --- linux-2.6.orig/kernel/power/power.h
> +++ linux-2.6/kernel/power/power.h
> @@ -52,6 +52,7 @@ static inline char *check_image_kernel(s
> extern int hibernation_snapshot(int platform_mode);
> extern int hibernation_restore(int platform_mode);
> extern int hibernation_platform_enter(void);
> +extern void hibernate_restore_gfp_mask(void);
>
> #else /* !CONFIG_HIBERNATION */
>
> Index: linux-2.6/kernel/power/user.c
> ===================================================================
> --- linux-2.6.orig/kernel/power/user.c
> +++ linux-2.6/kernel/power/user.c
> @@ -263,6 +263,7 @@ static long snapshot_ioctl(struct file *
> case SNAPSHOT_UNFREEZE:
> if (!data->frozen || data->ready)
> break;
> + hibernate_restore_gfp_mask();
> thaw_processes();
> usermodehelper_enable();
> data->frozen = 0;
--
Ondrej Zary
--
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/
Powered by blists - more mailing lists