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authorDarrick J. Wong <darrick.wong@oracle.com>2020-01-13 16:33:46 -0800
committerDarrick J. Wong <darrick.wong@oracle.com>2020-01-16 08:07:24 -0800
commit8a6453a89dc10269adb1fc0cd0ceba928d557c21 (patch)
tree9436eaf0077cc793ca8ebc34405d36633febfdae /fs/xfs
parentb7df5e92055c69666e3c82f31f193120d98f04e3 (diff)
downloadlinux-8a6453a89dc10269adb1fc0cd0ceba928d557c21.tar.bz2
xfs: check log iovec size to make sure it's plausibly a buffer log format
When log recovery is processing buffer log items, we should check that the incoming iovec actually describes a region of memory large enough to contain the log format and the dirty map. Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com> Reviewed-by: Christoph Hellwig <hch@lst.de>
Diffstat (limited to 'fs/xfs')
-rw-r--r--fs/xfs/xfs_buf_item.c17
-rw-r--r--fs/xfs/xfs_buf_item.h1
-rw-r--r--fs/xfs/xfs_log_recover.c6
3 files changed, 24 insertions, 0 deletions
diff --git a/fs/xfs/xfs_buf_item.c b/fs/xfs/xfs_buf_item.c
index be691d1d9fad..5be8973a452c 100644
--- a/fs/xfs/xfs_buf_item.c
+++ b/fs/xfs/xfs_buf_item.c
@@ -27,6 +27,23 @@ static inline struct xfs_buf_log_item *BUF_ITEM(struct xfs_log_item *lip)
STATIC void xfs_buf_do_callbacks(struct xfs_buf *bp);
+/* Is this log iovec plausibly large enough to contain the buffer log format? */
+bool
+xfs_buf_log_check_iovec(
+ struct xfs_log_iovec *iovec)
+{
+ struct xfs_buf_log_format *blfp = iovec->i_addr;
+ char *bmp_end;
+ char *item_end;
+
+ if (offsetof(struct xfs_buf_log_format, blf_data_map) > iovec->i_len)
+ return false;
+
+ item_end = (char *)iovec->i_addr + iovec->i_len;
+ bmp_end = (char *)&blfp->blf_data_map[blfp->blf_map_size];
+ return bmp_end <= item_end;
+}
+
static inline int
xfs_buf_log_format_size(
struct xfs_buf_log_format *blfp)
diff --git a/fs/xfs/xfs_buf_item.h b/fs/xfs/xfs_buf_item.h
index 4a054b11011a..30114b510332 100644
--- a/fs/xfs/xfs_buf_item.h
+++ b/fs/xfs/xfs_buf_item.h
@@ -61,6 +61,7 @@ void xfs_buf_iodone_callbacks(struct xfs_buf *);
void xfs_buf_iodone(struct xfs_buf *, struct xfs_log_item *);
bool xfs_buf_resubmit_failed_buffers(struct xfs_buf *,
struct list_head *);
+bool xfs_buf_log_check_iovec(struct xfs_log_iovec *iovec);
extern kmem_zone_t *xfs_buf_item_zone;
diff --git a/fs/xfs/xfs_log_recover.c b/fs/xfs/xfs_log_recover.c
index 99ec3fba4548..0d683fb96396 100644
--- a/fs/xfs/xfs_log_recover.c
+++ b/fs/xfs/xfs_log_recover.c
@@ -1934,6 +1934,12 @@ xlog_recover_buffer_pass1(
struct list_head *bucket;
struct xfs_buf_cancel *bcp;
+ if (!xfs_buf_log_check_iovec(&item->ri_buf[0])) {
+ xfs_err(log->l_mp, "bad buffer log item size (%d)",
+ item->ri_buf[0].i_len);
+ return -EFSCORRUPTED;
+ }
+
/*
* If this isn't a cancel buffer item, then just return.
*/