linux-kernel - [RFC PATCH v1 4/6] proc: Allow to use the allowlist filter in userns

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Date:   Wed, 25 Jan 2023 16:28:51 +0100
From:   Alexey Gladkov <legion@...nel.org>
To:     LKML <linux-kernel@...r.kernel.org>, containers@...ts.linux.dev,
        linux-fsdevel@...r.kernel.org
Cc:     Alexey Dobriyan <adobriyan@...il.com>,
        Al Viro <viro@...iv.linux.org.uk>,
        Andrew Morton <akpm@...ux-foundation.org>,
        Christian Brauner <brauner@...nel.org>,
        Val Cowan <vcowan@...hat.com>
Subject: [RFC PATCH v1 4/6] proc: Allow to use the allowlist filter in userns

Signed-off-by: Alexey Gladkov <legion@...nel.org>
---
 fs/proc/proc_allowlist.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/fs/proc/proc_allowlist.c b/fs/proc/proc_allowlist.c
index 2153acb8e467..c605f73622bd 100644
--- a/fs/proc/proc_allowlist.c
+++ b/fs/proc/proc_allowlist.c
@@ -100,7 +100,7 @@ static int open_allowlist(struct inode *inode, struct file *file)
 	struct proc_fs_info *fs_info = proc_sb_info(inode->i_sb);
 	int ret;
 
-	if (!capable(CAP_SYS_ADMIN))
+	if (!ns_capable(current_user_ns(), CAP_SYS_ADMIN))
 		return -EPERM;
 
 	// we need this because shrink_dcache_sb() can't drop our own dentry.
@@ -199,7 +199,7 @@ static const struct proc_ops proc_allowlist_ops = {
 static int __init proc_allowlist_init(void)
 {
 	struct proc_dir_entry *pde;
-	pde = proc_create("allowlist", S_IRUSR | S_IWUSR, NULL, &proc_allowlist_ops);
+	pde = proc_create("allowlist", S_IRUSR | S_IWUSR | S_IRGRP | S_IWGRP | S_IROTH | S_IWOTH, NULL, &proc_allowlist_ops);
 	pde_make_permanent(pde);
 	pde_make_allowlist(pde);
 	return 0;
-- 
2.33.6