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Power management fix for 5.5-rc8

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Prevent the kernel from crashing during resume from hibernation
 if free pages contain leftover data from the restore kernel and
 init_on_free is set (Alexander Potapenko).
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Merge tag 'pm-5.5-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm

Pull power management fix from Rafael Wysocki:
 "Prevent the kernel from crashing during resume from hibernation if
  free pages contain leftover data from the restore kernel and
  init_on_free is set (Alexander Potapenko)"

* tag 'pm-5.5-rc8' of git://git.kernel.org/pub/scm/linux/kernel/git/rafael/linux-pm:
  PM: hibernate: fix crashes with init_on_free=1
This commit is contained in:
Linus Torvalds 2020-01-23 11:10:21 -08:00
commit 3a83c8c81c
1 changed files with 10 additions and 10 deletions
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20
kernel/power/snapshot.c
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@ -1147,24 +1147,24 @@ void free_basic_memory_bitmaps(void)
void clear_free_pages(void) void clear_free_pages(void)
{ {
#ifdef CONFIG_PAGE_POISONING_ZERO
struct memory_bitmap *bm = free_pages_map; struct memory_bitmap *bm = free_pages_map;
unsigned long pfn; unsigned long pfn;
if (WARN_ON(!(free_pages_map))) if (WARN_ON(!(free_pages_map)))
return; return;
memory_bm_position_reset(bm); if (IS_ENABLED(CONFIG_PAGE_POISONING_ZERO) || want_init_on_free()) {
pfn = memory_bm_next_pfn(bm); memory_bm_position_reset(bm);
while (pfn != BM_END_OF_MAP) {
if (pfn_valid(pfn))
clear_highpage(pfn_to_page(pfn));
pfn = memory_bm_next_pfn(bm); pfn = memory_bm_next_pfn(bm);
while (pfn != BM_END_OF_MAP) {
if (pfn_valid(pfn))
clear_highpage(pfn_to_page(pfn));
pfn = memory_bm_next_pfn(bm);
}
memory_bm_position_reset(bm);
pr_info("free pages cleared after restore\n");
} }
memory_bm_position_reset(bm);
pr_info("free pages cleared after restore\n");
#endif /* PAGE_POISONING_ZERO */
} }
/** /**