| lists.openwall.net | lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC | |
|
Open Source and information security mailing list archives
| ||
|
Date: Tue, 3 Mar 2020 18:43:55 +0100
From: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To: linux-kernel@...r.kernel.org
Cc: Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
stable@...r.kernel.org, Vlastimil Babka <vbabka@...e.cz>,
Anshuman Khandual <anshuman.khandual@....com>,
Michal Hocko <mhocko@...nel.org>,
Michal Hocko <mhocko@...e.com>,
David Hildenbrand <david@...hat.com>, Qian Cai <cai@....pw>,
Oscar Salvador <osalvador@...e.de>,
Mel Gorman <mgorman@...hsingularity.net>,
Mike Rapoport <rppt@...ux.ibm.com>,
Dan Williams <dan.j.williams@...el.com>,
Pavel Tatashin <pavel.tatashin@...rosoft.com>,
Ralph Campbell <rcampbell@...dia.com>,
Andrew Morton <akpm@...ux-foundation.org>,
Linus Torvalds <torvalds@...ux-foundation.org>
Subject: [PATCH 5.5 171/176] mm/debug.c: always print flags in dump_page()
From: Vlastimil Babka <vbabka@...e.cz>
commit 5b57b8f22709f07c0ab5921c94fd66e8c59c3e11 upstream.
Commit 76a1850e4572 ("mm/debug.c: __dump_page() prints an extra line")
inadvertently removed printing of page flags for pages that are neither
anon nor ksm nor have a mapping. Fix that.
Using pr_cont() again would be a solution, but the commit explicitly
removed its use. Avoiding the danger of mixing up split lines from
multiple CPUs might be beneficial for near-panic dumps like this, so fix
this without reintroducing pr_cont().
Link: http://lkml.kernel.org/r/9f884d5c-ca60-dc7b-219c-c081c755fab6@suse.cz
Fixes: 76a1850e4572 ("mm/debug.c: __dump_page() prints an extra line")
Signed-off-by: Vlastimil Babka <vbabka@...e.cz>
Reported-by: Anshuman Khandual <anshuman.khandual@....com>
Reported-by: Michal Hocko <mhocko@...nel.org>
Acked-by: Michal Hocko <mhocko@...e.com>
Cc: David Hildenbrand <david@...hat.com>
Cc: Qian Cai <cai@....pw>
Cc: Oscar Salvador <osalvador@...e.de>
Cc: Mel Gorman <mgorman@...hsingularity.net>
Cc: Mike Rapoport <rppt@...ux.ibm.com>
Cc: Dan Williams <dan.j.williams@...el.com>
Cc: Pavel Tatashin <pavel.tatashin@...rosoft.com>
Cc: Ralph Campbell <rcampbell@...dia.com>
Signed-off-by: Andrew Morton <akpm@...ux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@...ux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
mm/debug.c | 8 +++++---
1 file changed, 5 insertions(+), 3 deletions(-)
--- a/mm/debug.c
+++ b/mm/debug.c
@@ -47,6 +47,7 @@ void __dump_page(struct page *page, cons
struct address_space *mapping;
bool page_poisoned = PagePoisoned(page);
int mapcount;
+ char *type = "";
/*
* If struct page is poisoned don't access Page*() functions as that
@@ -78,9 +79,9 @@ void __dump_page(struct page *page, cons
page, page_ref_count(page), mapcount,
page->mapping, page_to_pgoff(page));
if (PageKsm(page))
- pr_warn("ksm flags: %#lx(%pGp)\n", page->flags, &page->flags);
+ type = "ksm ";
else if (PageAnon(page))
- pr_warn("anon flags: %#lx(%pGp)\n", page->flags, &page->flags);
+ type = "anon ";
else if (mapping) {
if (mapping->host && mapping->host->i_dentry.first) {
struct dentry *dentry;
@@ -88,10 +89,11 @@ void __dump_page(struct page *page, cons
pr_warn("%ps name:\"%pd\"\n", mapping->a_ops, dentry);
} else
pr_warn("%ps\n", mapping->a_ops);
- pr_warn("flags: %#lx(%pGp)\n", page->flags, &page->flags);
}
BUILD_BUG_ON(ARRAY_SIZE(pageflag_names) != __NR_PAGEFLAGS + 1);
+ pr_warn("%sflags: %#lx(%pGp)\n", type, page->flags, &page->flags);
+
hex_only:
print_hex_dump(KERN_WARNING, "raw: ", DUMP_PREFIX_NONE, 32,
sizeof(unsigned long), page,
Powered by blists - more mailing lists