@@ -175,7 +175,7 @@ static errcode_t journal_add_revoke_to_trans(journal_transaction_t *trans,
void *buf;
size_t i, offset;
blk64_t curr_blk;
- int csum_size = 0;
+ int sz, csum_size = 0;
struct buffer_head *bh;
errcode_t err;
@@ -204,9 +204,15 @@ static errcode_t journal_add_revoke_to_trans(journal_transaction_t *trans,
jrb->r_header.h_sequence = ext2fs_cpu_to_be32(trans->tid);
offset = sizeof(*jrb);
+ if (JFS_HAS_INCOMPAT_FEATURE(trans->journal,
+ JFS_FEATURE_INCOMPAT_64BIT))
+ sz = 8;
+ else
+ sz = 4;
+
for (i = 0; i < revoke_len; i++) {
/* Block full, write to journal */
- if (offset > trans->journal->j_blocksize - csum_size) {
+ if (offset + sz >= trans->journal->j_blocksize - csum_size) {
jrb->r_count = ext2fs_cpu_to_be32(offset);
jbd2_revoke_csum_set(trans->journal, bh);
@@ -233,16 +239,13 @@ static errcode_t journal_add_revoke_to_trans(journal_transaction_t *trans,
}
if (JFS_HAS_INCOMPAT_FEATURE(trans->journal,
- JFS_FEATURE_INCOMPAT_64BIT)) {
+ JFS_FEATURE_INCOMPAT_64BIT))
*((__u64 *)(&((char *)buf)[offset])) =
ext2fs_cpu_to_be64(revoke_list[i]);
- offset += 8;
-
- } else {
+ else
*((__u32 *)(&((char *)buf)[offset])) =
ext2fs_cpu_to_be32(revoke_list[i]);
- offset += 4;
- }
+ offset += sz;
}
if (offset > 0) {
@@ -839,15 +839,23 @@ static int scan_revoke_records(journal_t *journal, struct buffer_head *bh,
{
journal_revoke_header_t *header;
int offset, max;
+ int csum_size = 0;
+ __u32 rcount;
int record_len = 4;
header = (journal_revoke_header_t *) bh->b_data;
offset = sizeof(journal_revoke_header_t);
- max = ext2fs_be32_to_cpu(header->r_count);
+ rcount = ext2fs_be32_to_cpu(header->r_count);
if (!jbd2_revoke_block_csum_verify(journal, header))
return -EINVAL;
+ if (journal_has_csum_v2or3(journal))
+ csum_size = sizeof(struct journal_revoke_tail);
+ if (rcount > journal->j_blocksize - csum_size)
+ return -EINVAL;
+ max = rcount;
+
if (JFS_HAS_INCOMPAT_FEATURE(journal, JFS_FEATURE_INCOMPAT_64BIT))
record_len = 8;
@@ -583,7 +583,7 @@ static void write_one_revoke_record(journal_t *journal,
{
int csum_size = 0;
struct buffer_head *descriptor;
- int offset;
+ int sz, offset;
journal_header_t *header;
/* If we are already aborting, this all becomes a noop. We
@@ -600,9 +600,14 @@ static void write_one_revoke_record(journal_t *journal,
if (journal_has_csum_v2or3(journal))
csum_size = sizeof(struct journal_revoke_tail);
+ if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_64BIT))
+ sz = 8;
+ else
+ sz = 4;
+
/* Make sure we have a descriptor with space left for the record */
if (descriptor) {
- if (offset >= journal->j_blocksize - csum_size) {
+ if (offset + sz >= journal->j_blocksize - csum_size) {
flush_descriptor(journal, descriptor, offset, write_op);
descriptor = NULL;
}
@@ -625,16 +630,13 @@ static void write_one_revoke_record(journal_t *journal,
*descriptorp = descriptor;
}
- if (JFS_HAS_INCOMPAT_FEATURE(journal, JFS_FEATURE_INCOMPAT_64BIT)) {
- * ((__u64 *)(&descriptor->b_data[offset])) =
- ext2fs_cpu_to_be64(record->blocknr);
- offset += 8;
-
- } else {
- * ((__u32 *)(&descriptor->b_data[offset])) =
- ext2fs_cpu_to_be32(record->blocknr);
- offset += 4;
- }
+ if (JBD2_HAS_INCOMPAT_FEATURE(journal, JBD2_FEATURE_INCOMPAT_64BIT)) {
+ * ((__be64 *)(&descriptor->b_data[offset])) =
+ cpu_to_be64(record->blocknr);
+ else
+ * ((__be32 *)(&descriptor->b_data[offset])) =
+ cpu_to_be32(record->blocknr);
+ offset += sz;
*offsetp = offset;
}
new file mode 100644
@@ -0,0 +1,8 @@
+test_filesys: recovering journal
+../e2fsck/e2fsck: Invalid argument while recovering ext3 journal of test_filesys
+
+test_filesys: ***** FILE SYSTEM WAS MODIFIED *****
+
+test_filesys: ********** WARNING: Filesystem still has errors **********
+
+Exit status is 12
new file mode 100644
@@ -0,0 +1,8 @@
+test_filesys: recovering journal
+Pass 1: Checking inodes, blocks, and sizes
+Pass 2: Checking directory structure
+Pass 3: Checking directory connectivity
+Pass 4: Checking reference counts
+Pass 5: Checking group summary information
+test_filesys: 11/512 files (9.1% non-contiguous), 1066/2048 blocks
+Exit status is 0
new file mode 100644
GIT binary patch
literal 8648
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z{>jKmO4PiOIZ^3am{^&Z=VN_=i}DJBE;>oCioccd>nF0BO1z)+-16Ss+k0iF&6IwY
zRyO^%K!dZkcOZYFq3Zi=#hl~wXMg6<PE9%bO@H-gZpAIP!}lGX@P60DNc}01hYNNV
z*{S9S?`zkbTlMGHwX5Hb3hS?n-T!gp&&<sIUE%L5|9?63HaPpe-rh>Hn^mQiMc-0;
z)*1v&)7E!SUM<#E^(}wO&(B+CCg~il=sFwXUp&=4`)$N*kM$87!|QsIqvRME{%8KE
zw>kRq+>d(eG+X5dZ!4a4N-;4oG#tGCj(w|hTpa@g!;j;iUjJ8COuM{rhj@ZY%FQn&
zh5YZIrzuBA?W@kuD*X9x?(B0@f$9z{kh*93|NlLmXa7MwM&ngnAo`CykTm$u4kUlw
z{IzrQdFK~)U-Gy7Hv8rh{yhGd_PockSCxR0JV*Zg_b}|w-`>4;<FYiMz=H#4|8M><
z`}#-mXW{0bOIH1R(0q#-D2@j_SdbxqHyPyU1@A4Hf&L&D9GHJ2Vs8A4V~JYdug}~f
zu~w^I_lkAq#+;m^23IEQmwmgjyR+-PV>ZjT!>1N+iO3KAQor%d&wuyctowSS{crs8
zKMQyLd6<&_KmPW`|K_LsKf$8l%VLA&|I;1ToG+PG@A~_E*R%iKAI}F!9<wLcoum3j
zLtr!nMnhmU1V%$(Gz3ONU^E0qLtr!nMnhmU1V%$(Gz3ONU^E0qLtr!nMnhmU1V%$(
zGz3ONU^E0qLtr!nMnhmU1V%$(XorCPt!8KN1i$0|_}Mj#V9#)OmhZI$E?!^&01SK{
AN&o-=
literal 0
HcmV?d00001
new file mode 100644
@@ -0,0 +1 @@
+corrupt revoke r_count buffer overflow
Check the value of r_count to ensure that we never try to read revoke records past the end of the revoke block. It turns out that the journal writing code in debugfs was also playing fast and loose with the r_count, so fix that as well. The Coverity bug was 1297508. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> --- debugfs/do_journal.c | 19 +++++++++++-------- e2fsck/recovery.c | 10 +++++++++- e2fsck/revoke.c | 26 ++++++++++++++------------ tests/j_corrupt_revoke_rcount/expect.1 | 8 ++++++++ tests/j_corrupt_revoke_rcount/expect.2 | 8 ++++++++ tests/j_corrupt_revoke_rcount/image.gz | Bin tests/j_corrupt_revoke_rcount/name | 1 + 7 files changed, 51 insertions(+), 21 deletions(-) create mode 100644 tests/j_corrupt_revoke_rcount/expect.1 create mode 100644 tests/j_corrupt_revoke_rcount/expect.2 create mode 100644 tests/j_corrupt_revoke_rcount/image.gz create mode 100644 tests/j_corrupt_revoke_rcount/name -- To unsubscribe from this list: send the line "unsubscribe linux-ext4" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html