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| author | Rafael J. Wysocki <rjw@sisk.pl> | 2005-09-27 21:45:43 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2005-09-28 07:46:41 -0700 |
| commit | 0f7347c20c410c300be0db4c132945fd02e54110 (patch) | |
| tree | 8f8a059eaed60c6d4f98a62f7dde447d4a76b9e3 /kernel | |
| parent | f65a4d10c8a4eb9f919cf416e5dcd720b7d20f50 (diff) | |
| download | linux-0f7347c20c410c300be0db4c132945fd02e54110.tar.gz linux-0f7347c20c410c300be0db4c132945fd02e54110.tar.bz2 linux-0f7347c20c410c300be0db4c132945fd02e54110.zip | |
[PATCH] swsusp: avoid problems if there are too many pages to save
The following patch makes swsusp avoid problems during resume if there are
too many pages to save on suspend. It adds a constant that allows us to
verify if we are going to save too many pages and implements the check
(this is done as early as we can tell that the check will trigger, which is
in swsusp_alloc()).
Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl>
Acked-by: Pavel Machek <pavel@suse.cz>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'kernel')
| -rw-r--r-- | kernel/power/power.h | 5 | ||||
| -rw-r--r-- | kernel/power/swsusp.c | 4 |
2 files changed, 8 insertions, 1 deletions
diff --git a/kernel/power/power.h b/kernel/power/power.h index 9c9167d910dd..6748de23e83c 100644 --- a/kernel/power/power.h +++ b/kernel/power/power.h @@ -9,6 +9,9 @@ #define SUSPEND_CONSOLE (MAX_NR_CONSOLES-1) #endif +#define MAX_PBES ((PAGE_SIZE - sizeof(struct new_utsname) \ + - 4 - 3*sizeof(unsigned long) - sizeof(int) \ + - sizeof(void *)) / sizeof(swp_entry_t)) struct swsusp_info { struct new_utsname uts; @@ -18,7 +21,7 @@ struct swsusp_info { unsigned long image_pages; unsigned long pagedir_pages; suspend_pagedir_t * suspend_pagedir; - swp_entry_t pagedir[768]; + swp_entry_t pagedir[MAX_PBES]; } __attribute__((aligned(PAGE_SIZE))); diff --git a/kernel/power/swsusp.c b/kernel/power/swsusp.c index 0dfb24948907..acf79ac1cb6d 100644 --- a/kernel/power/swsusp.c +++ b/kernel/power/swsusp.c @@ -931,6 +931,10 @@ static int swsusp_alloc(void) if (!enough_swap()) return -ENOSPC; + if (MAX_PBES < nr_copy_pages / PBES_PER_PAGE + + !!(nr_copy_pages % PBES_PER_PAGE)) + return -ENOSPC; + if (!(pagedir_save = alloc_pagedir(nr_copy_pages))) { printk(KERN_ERR "suspend: Allocating pagedir failed.\n"); return -ENOMEM; |