linux-kernel - [PATCH v2 1/2] mm: mmap: map MAP_STACK to VM

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]

Message-Id: <20250506-map-map_stack-to-vm_nohugepage-only-if-thp-is-enabled-v2-1-f11f0c794872@kuka.com>
Date: Tue, 06 May 2025 15:44:32 +0200
From: Ignacio Moreno Gonzalez via B4 Relay <devnull+Ignacio.MorenoGonzalez.kuka.com@...nel.org>
To: lorenzo.stoakes@...cle.com
Cc: Liam.Howlett@...cle.com, akpm@...ux-foundation.org, 
 yang@...amperecomputing.com, linux-mm@...ck.org, 
 linux-kernel@...r.kernel.org, 
 Ignacio Moreno Gonzalez <Ignacio.MorenoGonzalez@...a.com>, 
 stable@...r.kernel.org
Subject: [PATCH v2 1/2] mm: mmap: map MAP_STACK to VM_NOHUGEPAGE only if
 THP is enabled

From: Ignacio Moreno Gonzalez <Ignacio.MorenoGonzalez@...a.com>

commit c4608d1bf7c6 ("mm: mmap: map MAP_STACK to VM_NOHUGEPAGE") maps
the mmap option MAP_STACK to VM_NOHUGEPAGE. This is also done if
CONFIG_TRANSPARENT_HUGETABLES is not defined. But in that case, the
VM_NOHUGEPAGE does not make sense.

Fixes: c4608d1bf7c6 ("mm: mmap: map MAP_STACK to VM_NOHUGEPAGE")
Cc: stable@...r.kernel.org
Reviewed-by: Lorenzo Stoakes <lorenzo.stoakes@...cle.com>
Reviewed-by: Yang Shi <yang@...amperecomputing.com>
Signed-off-by: Ignacio Moreno Gonzalez <Ignacio.MorenoGonzalez@...a.com>
---
 include/linux/mman.h | 2 ++
 1 file changed, 2 insertions(+)

diff --git a/include/linux/mman.h b/include/linux/mman.h
index bce214fece16b9af3791a2baaecd6063d0481938..f4c6346a8fcd29b08d43f7cd9158c3eddc3383e1 100644
--- a/include/linux/mman.h
+++ b/include/linux/mman.h
@@ -155,7 +155,9 @@ calc_vm_flag_bits(struct file *file, unsigned long flags)
 	return _calc_vm_trans(flags, MAP_GROWSDOWN,  VM_GROWSDOWN ) |
 	       _calc_vm_trans(flags, MAP_LOCKED,     VM_LOCKED    ) |
 	       _calc_vm_trans(flags, MAP_SYNC,	     VM_SYNC      ) |
+#ifdef CONFIG_TRANSPARENT_HUGEPAGE
 	       _calc_vm_trans(flags, MAP_STACK,	     VM_NOHUGEPAGE) |
+#endif
 	       arch_calc_vm_flag_bits(file, flags);
 }
 

-- 
2.39.5