The patch titled
swsusp: prevent possible image corruption on resume
has been removed from the -mm tree. Its filename is
swsusp-prevent-possible-image-corruption-on-resume.patch
This patch was probably dropped from -mm because
it has now been merged into a subsystem tree or
into Linus's tree, or because it was folded into
its parent patch in the -mm tree.
From: "Rafael J. Wysocki" <rjw@xxxxxxx>
The function free_pagedir() used by swsusp for freeing its internal data
structures clears the PG_nosave and PG_nosave_free flags for each page
being freed. However, during resume PG_nosave_free set means that the page
in question is "unsafe" (ie. it will be overwritten in the process of
restoring the saved system state from the image), so it should not be used
for the image data. Therefore free_pagedir() should not clear
PG_nosave_free if it's called during resume (otherwise "unsafe" pages freed
by it may be used for storing the image data and the data may get corrupted
later on).
Signed-off-by: Rafael J. Wysocki <rjw@xxxxxxx>
Acked-by: Pavel Machek <pavel@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxx>
---
kernel/power/snapshot.c | 9 +++++----
1 files changed, 5 insertions(+), 4 deletions(-)
diff -puN kernel/power/snapshot.c~swsusp-prevent-possible-image-corruption-on-resume kernel/power/snapshot.c
--- devel/kernel/power/snapshot.c~swsusp-prevent-possible-image-corruption-on-resume 2006-04-18 22:19:58.000000000 -0700
+++ devel-akpm/kernel/power/snapshot.c 2006-04-18 22:19:58.000000000 -0700
@@ -240,14 +240,15 @@ static void copy_data_pages(struct pbe *
* free_pagedir - free pages allocated with alloc_pagedir()
*/
-static void free_pagedir(struct pbe *pblist)
+static void free_pagedir(struct pbe *pblist, int clear_nosave_free)
{
struct pbe *pbe;
while (pblist) {
pbe = (pblist + PB_PAGE_SKIP)->next;
ClearPageNosave(virt_to_page(pblist));
- ClearPageNosaveFree(virt_to_page(pblist));
+ if (clear_nosave_free)
+ ClearPageNosaveFree(virt_to_page(pblist));
free_page((unsigned long)pblist);
pblist = pbe;
}
@@ -389,7 +390,7 @@ struct pbe *alloc_pagedir(unsigned int n
pbe->next = alloc_image_page(gfp_mask, safe_needed);
}
if (!pbe) { /* get_zeroed_page() failed */
- free_pagedir(pblist);
+ free_pagedir(pblist, 1);
pblist = NULL;
} else
create_pbe_list(pblist, nr_pages);
@@ -736,7 +737,7 @@ static int create_image(struct snapshot_
pblist = alloc_pagedir(nr_copy_pages, GFP_ATOMIC, 1);
if (pblist)
copy_page_backup_list(pblist, p);
- free_pagedir(p);
+ free_pagedir(p, 0);
if (!pblist)
error = -ENOMEM;
}
_
Patches currently in -mm which might be from rjw@xxxxxxx are
origin.patch
swsusp-rework-memory-shrinker-rev-2.patch
swsusp-add-architecture-special-saveable-pages-support.patch
swsusp-i386-mark-special-saveable-unsaveable-pages.patch
swsusp-x86_64-mark-special-saveable-unsaveable-pages.patch
swsusp-take-lowmem-reserves-into-account.patch
-
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