linux-kernel - Re: 2.6.24.2: 4KSTACKS + pcdrw + dm + mount -> stack overflow: ide-cd related? dm-related?

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: <Pine.LNX.4.64.0802261207140.30955@jikos.suse.cz>
Date:	Tue, 26 Feb 2008 12:10:34 +0100 (CET)
From:	Jiri Kosina <jkosina@...e.cz>
To:	Jan Kara <jack@...e.cz>
cc:	Andrew Morton <akpm@...ux-foundation.org>, Nix <nix@...eri.org.uk>,
	Peter Osterlund <petero2@...ia.com>,
	linux-kernel@...r.kernel.org, dm-devel@...hat.com,
	Jan Kara <jack@....cz>
Subject: Re: 2.6.24.2: 4KSTACKS + pcdrw + dm + mount -> stack overflow: ide-cd
 related? dm-related?

On Mon, 25 Feb 2008, Jan Kara wrote:

>   Yes, exactly two of them. One is  non-trivial to get rid of - it's
> used for encoding of filename before we write it, 

Why can't we do just



UDF: Optimize stack usage

Signed-off-by: Jiri Kosina <jkosina@...e.cz>

diff --git a/fs/udf/namei.c b/fs/udf/namei.c
index 112a5fb..706a2b5 100644
--- a/fs/udf/namei.c
+++ b/fs/udf/namei.c
@@ -336,7 +336,7 @@ static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 {
 	struct super_block *sb = dir->i_sb;
 	struct fileIdentDesc *fi = NULL;
-	char name[UDF_NAME_LEN], fname[UDF_NAME_LEN];
+	char *name, *fname;
 	int namelen;
 	loff_t f_pos;
 	int flen;
@@ -352,6 +352,14 @@ static struct fileIdentDesc *udf_add_entry(struct inode *dir,
 	struct extent_position epos = {};
 	struct udf_inode_info *dinfo;
 
+	name = kmalloc(sizeof(char) * UDF_NAME_LEN, GFP_KERNEL);
+	fname = kmalloc(sizeof(char) * UDF_NAME_LEN, GFP_KERNEL);
+
+	if (!name || !fname) {
+		*err = -ENOMEM;
+		return NULL;
+	}
+
 	if (dentry) {
 		if (!dentry->d_name.len) {
 			*err = -EINVAL;
diff --git a/fs/udf/super.c b/fs/udf/super.c
index f3ac4ab..42e3ba8 100644
--- a/fs/udf/super.c
+++ b/fs/udf/super.c
@@ -1345,7 +1345,7 @@ static void udf_load_logicalvolint(struct super_block *sb, kernel_extent_ad loc)
  *	July 1, 1997 - Andrew E. Mileski
  *	Written, tested, and released.
  */
-static int udf_process_sequence(struct super_block *sb, long block,
+static int noinline udf_process_sequence(struct super_block *sb, long block,
 				long lastblock, kernel_lb_addr *fileset)
 {
 	struct buffer_head *bh = NULL;
--
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/