| 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
| ||
|
Message-ID: <20111129003036.17953.68970.stgit@elm3c44.beaverton.ibm.com>
Date: Mon, 28 Nov 2011 16:30:36 -0800
From: "Darrick J. Wong" <djwong@...ibm.com>
To: Andreas Dilger <adilger.kernel@...ger.ca>,
Theodore Tso <tytso@....edu>,
"Darrick J. Wong" <djwong@...ibm.com>
Cc: Sunil Mushran <sunil.mushran@...cle.com>,
Amir Goldstein <amir73il@...il.com>,
Andi Kleen <andi@...stfloor.org>,
Mingming Cao <cmm@...ibm.com>,
Joel Becker <jlbec@...lplan.org>, linux-ext4@...r.kernel.org,
Coly Li <colyli@...il.com>
Subject: [PATCH 24/50] e2fsck: Verify htree root/node checksums
Check htree internal node checksums. If broken, ask user to clear the htree
index and recreate it later.
Signed-off-by: Darrick J. Wong <djwong@...ibm.com>
---
e2fsck/pass2.c | 31 ++++++++++++++++++++++++++-----
e2fsck/problem.c | 10 ++++++++++
e2fsck/problem.h | 6 ++++++
e2fsck/rehash.c | 16 ++++++++++++++--
4 files changed, 56 insertions(+), 7 deletions(-)
diff --git a/e2fsck/pass2.c b/e2fsck/pass2.c
index 103b155..e11ddbf 100644
--- a/e2fsck/pass2.c
+++ b/e2fsck/pass2.c
@@ -522,7 +522,7 @@ static void parse_int_node(ext2_filsys fs,
struct ext2_db_entry2 *db,
struct check_dir_struct *cd,
struct dx_dir_info *dx_dir,
- char *block_buf)
+ char *block_buf, int failed_csum)
{
struct ext2_dx_root_info *root;
struct ext2_dx_entry *ent;
@@ -533,6 +533,7 @@ static void parse_int_node(ext2_filsys fs,
ext2_dirhash_t min_hash = 0xffffffff;
ext2_dirhash_t max_hash = 0;
ext2_dirhash_t hash = 0, prev_hash;
+ int csum_size = 0;
if (db->blockcnt == 0) {
root = (struct ext2_dx_root_info *) (block_buf + 24);
@@ -547,9 +548,20 @@ static void parse_int_node(ext2_filsys fs,
#endif
ent = (struct ext2_dx_entry *) (block_buf + 24 + root->info_length);
+
+ if (failed_csum &&
+ fix_problem(cd->ctx, PR_2_HTREE_ROOT_CSUM_INVALID,
+ &cd->pctx))
+ goto clear_and_exit;
} else {
ent = (struct ext2_dx_entry *) (block_buf+8);
+
+ if (failed_csum &&
+ fix_problem(cd->ctx, PR_2_HTREE_NODE_CSUM_INVALID,
+ &cd->pctx))
+ goto clear_and_exit;
}
+
limit = (struct ext2_dx_countlimit *) ent;
#ifdef DX_DEBUG
@@ -560,8 +572,12 @@ static void parse_int_node(ext2_filsys fs,
#endif
count = ext2fs_le16_to_cpu(limit->count);
- expect_limit = (fs->blocksize - ((char *) ent - block_buf)) /
- sizeof(struct ext2_dx_entry);
+ if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+ csum_size = sizeof(struct ext2_dx_tail);
+ expect_limit = (fs->blocksize -
+ (csum_size + ((char *) ent - block_buf))) /
+ sizeof(struct ext2_dx_entry);
if (ext2fs_le16_to_cpu(limit->limit) != expect_limit) {
cd->pctx.num = ext2fs_le16_to_cpu(limit->limit);
if (fix_problem(cd->ctx, PR_2_HTREE_BAD_LIMIT, &cd->pctx))
@@ -729,6 +745,7 @@ static int check_dir_block(ext2_filsys fs,
struct problem_context pctx;
int dups_found = 0;
int ret;
+ int csum_size = 0;
cd = (struct check_dir_struct *) priv_data;
buf = cd->buf;
@@ -740,6 +757,10 @@ static int check_dir_block(ext2_filsys fs,
if (ctx->progress && (ctx->progress)(ctx, 2, cd->count++, cd->max))
return DIRENT_ABORT;
+ if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+ csum_size = sizeof(struct ext2_dx_tail);
+
/*
* Make sure the inode is still in use (could have been
* deleted in the duplicate/bad blocks pass.
@@ -829,7 +850,7 @@ static int check_dir_block(ext2_filsys fs,
(rec_len == fs->blocksize) &&
(dirent->name_len == 0) &&
(ext2fs_le16_to_cpu(limit->limit) ==
- ((fs->blocksize-8) /
+ ((fs->blocksize - (8 + csum_size)) /
sizeof(struct ext2_dx_entry))))
dx_db->type = DX_DIRBLOCK_NODE;
}
@@ -1116,7 +1137,7 @@ out_htree:
cd->pctx.dir = cd->pctx.ino;
if ((dx_db->type == DX_DIRBLOCK_ROOT) ||
(dx_db->type == DX_DIRBLOCK_NODE))
- parse_int_node(fs, db, cd, dx_dir, buf);
+ parse_int_node(fs, db, cd, dx_dir, buf, 0);
}
#endif /* ENABLE_HTREE */
if (offset != fs->blocksize) {
diff --git a/e2fsck/problem.c b/e2fsck/problem.c
index 96b0de5..2e9ab7f 100644
--- a/e2fsck/problem.c
+++ b/e2fsck/problem.c
@@ -1374,6 +1374,16 @@ static struct e2fsck_problem problem_table[] = {
N_("i_file_acl_hi @F %N, @s zero.\n"),
PROMPT_CLEAR, PR_PREEN_OK },
+ /* htree root node fails checksum */
+ { PR_2_HTREE_ROOT_CSUM_INVALID,
+ N_("@p @h %d: root node fails checksum\n"),
+ PROMPT_CLEAR_HTREE, PR_PREEN_OK },
+
+ /* htree internal node fails checksum */
+ { PR_2_HTREE_NODE_CSUM_INVALID,
+ N_("@p @h %d: node fails checksum\n"),
+ PROMPT_CLEAR_HTREE, PR_PREEN_OK },
+
/* Pass 3 errors */
/* Pass 3: Checking directory connectivity */
diff --git a/e2fsck/problem.h b/e2fsck/problem.h
index a1e7ffb..08c06e1 100644
--- a/e2fsck/problem.h
+++ b/e2fsck/problem.h
@@ -821,6 +821,12 @@ struct problem_context {
/* i_file_acl_hi should be zero */
#define PR_2_I_FILE_ACL_HI_ZERO 0x020048
+/* htree root node fails checksum */
+#define PR_2_HTREE_ROOT_CSUM_INVALID 0x020049
+
+/* htree node fails checksum */
+#define PR_2_HTREE_NODE_CSUM_INVALID 0x02004A
+
/*
* Pass 3 errors
*/
diff --git a/e2fsck/rehash.c b/e2fsck/rehash.c
index 15993b3..a472aad 100644
--- a/e2fsck/rehash.c
+++ b/e2fsck/rehash.c
@@ -495,6 +495,7 @@ static struct ext2_dx_root_info *set_root_node(ext2_filsys fs, char *buf,
struct ext2_dx_root_info *root;
struct ext2_dx_countlimit *limits;
int filetype = 0;
+ int csum_size = 0;
if (fs->super->s_feature_incompat & EXT2_FEATURE_INCOMPAT_FILETYPE)
filetype = EXT2_FT_DIR << 8;
@@ -519,8 +520,13 @@ static struct ext2_dx_root_info *set_root_node(ext2_filsys fs, char *buf,
root->indirect_levels = 0;
root->unused_flags = 0;
+ if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+ csum_size = sizeof(struct ext2_dx_tail);
+
limits = (struct ext2_dx_countlimit *) (buf+32);
- limits->limit = (fs->blocksize - 32) / sizeof(struct ext2_dx_entry);
+ limits->limit = (fs->blocksize - (32 + csum_size)) /
+ sizeof(struct ext2_dx_entry);
limits->count = 0;
return root;
@@ -531,14 +537,20 @@ static struct ext2_dx_entry *set_int_node(ext2_filsys fs, char *buf)
{
struct ext2_dir_entry *dir;
struct ext2_dx_countlimit *limits;
+ int csum_size = 0;
memset(buf, 0, fs->blocksize);
dir = (struct ext2_dir_entry *) buf;
dir->inode = 0;
(void) ext2fs_set_rec_len(fs, fs->blocksize, dir);
+ if (EXT2_HAS_RO_COMPAT_FEATURE(fs->super,
+ EXT4_FEATURE_RO_COMPAT_METADATA_CSUM))
+ csum_size = sizeof(struct ext2_dx_tail);
+
limits = (struct ext2_dx_countlimit *) (buf+8);
- limits->limit = (fs->blocksize - 8) / sizeof(struct ext2_dx_entry);
+ limits->limit = (fs->blocksize - (8 + csum_size)) /
+ sizeof(struct ext2_dx_entry);
limits->count = 0;
return (struct ext2_dx_entry *) limits;
--
To unsubscribe from this list: send the line "unsubscribe linux-ext4" in
the body of a message to majordomo@...r.kernel.org
More majordomo info at http://vger.kernel.org/majordomo-info.html
Powered by blists - more mailing lists