linux-kernel - [PATCH v2 4/4] tmpfs: opt-in for IOP_MAY_FAST

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: <20251106180103.923856-5-mjguzik@gmail.com>
Date: Thu,  6 Nov 2025 19:01:02 +0100
From: Mateusz Guzik <mjguzik@...il.com>
To: brauner@...nel.org
Cc: viro@...iv.linux.org.uk,
	jack@...e.cz,
	linux-kernel@...r.kernel.org,
	linux-fsdevel@...r.kernel.org,
	linux-ext4@...r.kernel.org,
	tytso@....edu,
	torvalds@...ux-foundation.org,
	josef@...icpanda.com,
	linux-btrfs@...r.kernel.org,
	Mateusz Guzik <mjguzik@...il.com>
Subject: [PATCH v2 4/4] tmpfs: opt-in for IOP_MAY_FAST_EXEC

Signed-off-by: Mateusz Guzik <mjguzik@...il.com>
---
 mm/shmem.c | 9 +++++++++
 1 file changed, 9 insertions(+)

diff --git a/mm/shmem.c b/mm/shmem.c
index c819cecf1ed9..265456bc6bf0 100644
--- a/mm/shmem.c
+++ b/mm/shmem.c
@@ -3106,6 +3106,15 @@ static struct inode *__shmem_get_inode(struct mnt_idmap *idmap,
 	}
 
 	lockdep_annotate_inode_mutex_key(inode);
+
+	if (S_ISDIR(mode)) {
+		WARN_ON_ONCE(inode_state_read_once(inode) & I_NEW);
+		/* satisfy an assert inside */
+		inode_state_set_raw(inode, I_NEW);
+		inode_enable_fast_may_exec(inode);
+		inode_state_clear_raw(inode, I_NEW);
+	}
+
 	return inode;
 }
 
-- 
2.48.1