diff options
Diffstat (limited to 'mm')
| -rw-r--r-- | mm/filemap.c | 25 | ||||
| -rw-r--r-- | mm/hugetlb.c | 6 | ||||
| -rw-r--r-- | mm/kasan/kasan.c | 20 | ||||
| -rw-r--r-- | mm/mempolicy.c | 2 |
4 files changed, 48 insertions, 5 deletions
diff --git a/mm/filemap.c b/mm/filemap.c index 3461d97ecb30..da7a35d83de7 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -195,6 +195,30 @@ void __delete_from_page_cache(struct page *page, void *shadow, else cleancache_invalidate_page(mapping, page); + VM_BUG_ON_PAGE(page_mapped(page), page); + if (!IS_ENABLED(CONFIG_DEBUG_VM) && unlikely(page_mapped(page))) { + int mapcount; + + pr_alert("BUG: Bad page cache in process %s pfn:%05lx\n", + current->comm, page_to_pfn(page)); + dump_page(page, "still mapped when deleted"); + dump_stack(); + add_taint(TAINT_BAD_PAGE, LOCKDEP_NOW_UNRELIABLE); + + mapcount = page_mapcount(page); + if (mapping_exiting(mapping) && + page_count(page) >= mapcount + 2) { + /* + * All vmas have already been torn down, so it's + * a good bet that actually the page is unmapped, + * and we'd prefer not to leak it: if we're wrong, + * some other bad page check should catch it later. + */ + page_mapcount_reset(page); + atomic_sub(mapcount, &page->_count); + } + } + page_cache_tree_delete(mapping, page, shadow); page->mapping = NULL; @@ -205,7 +229,6 @@ void __delete_from_page_cache(struct page *page, void *shadow, __dec_zone_page_state(page, NR_FILE_PAGES); if (PageSwapBacked(page)) __dec_zone_page_state(page, NR_SHMEM); - VM_BUG_ON_PAGE(page_mapped(page), page); /* * At this point page must be either written or cleaned by truncate. diff --git a/mm/hugetlb.c b/mm/hugetlb.c index 01f2b48c8618..aefba5a9cc47 100644 --- a/mm/hugetlb.c +++ b/mm/hugetlb.c @@ -2751,7 +2751,7 @@ static int hugetlb_sysctl_handler_common(bool obey_mempolicy, int ret; if (!hugepages_supported()) - return -ENOTSUPP; + return -EOPNOTSUPP; table->data = &tmp; table->maxlen = sizeof(unsigned long); @@ -2792,7 +2792,7 @@ int hugetlb_overcommit_handler(struct ctl_table *table, int write, int ret; if (!hugepages_supported()) - return -ENOTSUPP; + return -EOPNOTSUPP; tmp = h->nr_overcommit_huge_pages; @@ -3502,7 +3502,7 @@ static int hugetlb_no_page(struct mm_struct *mm, struct vm_area_struct *vma, * COW. Warn that such a situation has occurred as it may not be obvious */ if (is_vma_resv_set(vma, HPAGE_RESV_UNMAPPED)) { - pr_warning("PID %d killed due to inadequate hugepage pool\n", + pr_warn_ratelimited("PID %d killed due to inadequate hugepage pool\n", current->pid); return ret; } diff --git a/mm/kasan/kasan.c b/mm/kasan/kasan.c index bc0a8d8b8f42..1ad20ade8c91 100644 --- a/mm/kasan/kasan.c +++ b/mm/kasan/kasan.c @@ -20,6 +20,7 @@ #include <linux/init.h> #include <linux/kernel.h> #include <linux/kmemleak.h> +#include <linux/linkage.h> #include <linux/memblock.h> #include <linux/memory.h> #include <linux/mm.h> @@ -60,6 +61,25 @@ void kasan_unpoison_shadow(const void *address, size_t size) } } +static void __kasan_unpoison_stack(struct task_struct *task, void *sp) +{ + void *base = task_stack_page(task); + size_t size = sp - base; + + kasan_unpoison_shadow(base, size); +} + +/* Unpoison the entire stack for a task. */ +void kasan_unpoison_task_stack(struct task_struct *task) +{ + __kasan_unpoison_stack(task, task_stack_page(task) + THREAD_SIZE); +} + +/* Unpoison the stack for the current task beyond a watermark sp value. */ +asmlinkage void kasan_unpoison_remaining_stack(void *sp) +{ + __kasan_unpoison_stack(current, sp); +} /* * All functions below always inlined so compiler could diff --git a/mm/mempolicy.c b/mm/mempolicy.c index 4c4187c0e1de..9a3f6b90e628 100644 --- a/mm/mempolicy.c +++ b/mm/mempolicy.c @@ -532,7 +532,7 @@ retry: nid = page_to_nid(page); if (node_isset(nid, *qp->nmask) == !!(flags & MPOL_MF_INVERT)) continue; - if (PageTail(page) && PageAnon(page)) { + if (PageTransCompound(page) && PageAnon(page)) { get_page(page); pte_unmap_unlock(pte, ptl); lock_page(page); |