linux-kernel - [PATCH v2 15/70] mm/mmap: Change vm_brk_flags() to use mm_populate

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

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Date:   Tue, 12 Jan 2021 11:11:45 -0500
From:   "Liam R. Howlett" <Liam.Howlett@...cle.com>
To:     maple-tree@...ts.infradead.org, linux-mm@...ck.org,
        linux-kernel@...r.kernel.org
Cc:     Andrew Morton <akpm@...gle.com>, Song Liu <songliubraving@...com>,
        Davidlohr Bueso <dave@...olabs.net>,
        "Paul E . McKenney" <paulmck@...nel.org>,
        Matthew Wilcox <willy@...radead.org>,
        Jerome Glisse <jglisse@...hat.com>,
        David Rientjes <rientjes@...gle.com>,
        Axel Rasmussen <axelrasmussen@...gle.com>,
        Suren Baghdasaryan <surenb@...gle.com>,
        Vlastimil Babka <vbabka@...e.cz>,
        Rik van Riel <riel@...riel.com>,
        Peter Zijlstra <peterz@...radead.org>
Subject: [PATCH v2 15/70] mm/mmap: Change vm_brk_flags() to use mm_populate_vma()

Skip searching for the vma to populate after creating it by passing in a pointer.

Signed-off-by: Liam R. Howlett <Liam.Howlett@...cle.com>
---
 mm/mmap.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/mm/mmap.c b/mm/mmap.c
index f500d5e490f1c..cab665a6daa05 100644
--- a/mm/mmap.c
+++ b/mm/mmap.c
@@ -3045,10 +3045,10 @@ int vm_brk_flags(unsigned long addr, unsigned long request, unsigned long flags)
 	// This vma left intentionally blank.
 	mas_walk(&mas);
 	ret = do_brk_flags(&mas, &vma, addr, len, flags);
-	populate = ((mm->def_flags & VM_LOCKED) != 0);
 	mmap_write_unlock(mm);
+	populate = ((mm->def_flags & VM_LOCKED) != 0);
 	if (populate && !ret)
-		mm_populate(addr, len);
+		mm_populate_vma(vma, addr, addr + len);
 	return ret;
 }
 EXPORT_SYMBOL(vm_brk_flags);
-- 
2.28.0