linux-kernel - [PATCH] mm/memblock: validate the creation of debugfs files

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-next>] [day] [month] [year] [list]

Message-Id: <1439579292-15458-1-git-send-email-kuleshovmail@gmail.com>
Date:	Sat, 15 Aug 2015 01:08:11 +0600
From:	Alexander Kuleshov <kuleshovmail@...il.com>
To:	Tomas Winkler <tomas.winkler@...el.com>
Cc:	linux-kernel@...r.kernel.org,
	Alexander Kuleshov <kuleshovmail@...il.com>
Subject: [PATCH] mm/memblock: validate the creation of debugfs files

Signed-off-by: Alexander Kuleshov <kuleshovmail@...il.com>
---
 mm/memblock.c | 24 +++++++++++++++++++++---
 1 file changed, 21 insertions(+), 3 deletions(-)

diff --git a/mm/memblock.c b/mm/memblock.c
index 87108e7..c09e911 100644
--- a/mm/memblock.c
+++ b/mm/memblock.c
@@ -1692,16 +1692,34 @@ static const struct file_operations memblock_debug_fops = {
 
 static int __init memblock_init_debugfs(void)
 {
+	struct dentry *f;
 	struct dentry *root = debugfs_create_dir("memblock", NULL);
 	if (!root)
 		return -ENXIO;
-	debugfs_create_file("memory", S_IRUGO, root, &memblock.memory, &memblock_debug_fops);
-	debugfs_create_file("reserved", S_IRUGO, root, &memblock.reserved, &memblock_debug_fops);
+
+	f = debugfs_create_file("memory", S_IRUGO, root, &memblock.memory, &memblock_debug_fops);
+	if (!f) {
+		pr_err("Failed to create memory debugfs file\n");
+		goto err_out;
+	}
+
+	f = debugfs_create_file("reserved", S_IRUGO, root, &memblock.reserved, &memblock_debug_fops);
+	if (!f) {
+		pr_err("Failed to create reserved debugfs file\n");
+		goto err_out;
+	}
+
 #ifdef CONFIG_HAVE_MEMBLOCK_PHYS_MAP
-	debugfs_create_file("physmem", S_IRUGO, root, &memblock.physmem, &memblock_debug_fops);
+	f = debugfs_create_file("physmem", S_IRUGO, root, &memblock.physmem, &memblock_debug_fops);
+	if (!f) {
+		pr_err("Failed to create physmem debugfs file\n");
+		goto err_out;
+	}
 #endif
 
 	return 0;
+err_out:
+	return -ENOMEM;
 }
 __initcall(memblock_init_debugfs);
 
-- 
2.5.0

--
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at  http://vger.kernel.org/majordomo-info.html
Please read the FAQ at  http://www.tux.org/lkml/