diff options
| -rw-r--r-- | mm/madvise.c | 34 |
1 files changed, 20 insertions, 14 deletions
diff --git a/mm/madvise.c b/mm/madvise.c index a09d2d3dfae9..31da09412934 100644 --- a/mm/madvise.c +++ b/mm/madvise.c @@ -605,34 +605,40 @@ static long madvise_remove(struct vm_area_struct *vma, /* * Error injection support for memory error handling. */ -static int madvise_hwpoison(int bhv, unsigned long start, unsigned long end) +static int madvise_inject_error(int behavior, + unsigned long start, unsigned long end) { - struct page *p; + struct page *page; + if (!capable(CAP_SYS_ADMIN)) return -EPERM; + for (; start < end; start += PAGE_SIZE << - compound_order(compound_head(p))) { + compound_order(compound_head(page))) { int ret; - ret = get_user_pages_fast(start, 1, 0, &p); + ret = get_user_pages_fast(start, 1, 0, &page); if (ret != 1) return ret; - if (PageHWPoison(p)) { - put_page(p); + if (PageHWPoison(page)) { + put_page(page); continue; } - if (bhv == MADV_SOFT_OFFLINE) { - pr_info("Soft offlining page %#lx at %#lx\n", - page_to_pfn(p), start); - ret = soft_offline_page(p, MF_COUNT_INCREASED); + + if (behavior == MADV_SOFT_OFFLINE) { + pr_info("Soft offlining pfn %#lx at process virtual address %#lx\n", + page_to_pfn(page), start); + + ret = soft_offline_page(page, MF_COUNT_INCREASED); if (ret) return ret; continue; } - pr_info("Injecting memory failure for page %#lx at %#lx\n", - page_to_pfn(p), start); - ret = memory_failure(page_to_pfn(p), 0, MF_COUNT_INCREASED); + pr_info("Injecting memory failure for pfn %#lx at process virtual address %#lx\n", + page_to_pfn(page), start); + + ret = memory_failure(page_to_pfn(page), 0, MF_COUNT_INCREASED); if (ret) return ret; } @@ -756,7 +762,7 @@ SYSCALL_DEFINE3(madvise, unsigned long, start, size_t, len_in, int, behavior) #ifdef CONFIG_MEMORY_FAILURE if (behavior == MADV_HWPOISON || behavior == MADV_SOFT_OFFLINE) - return madvise_hwpoison(behavior, start, start+len_in); + return madvise_inject_error(behavior, start, start + len_in); #endif if (!madvise_behavior_valid(behavior)) return error; |