Minki/linux
1
0
Fork 1
mirror of https://github.com/torvalds/linux.git synced 2024-11-22 20:22:09 +00:00
Code Issues Packages Projects Releases Wiki Activity

xfs: check log iovec size to make sure it's plausibly a buffer log format

Browse Source 
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>
This commit is contained in:
Darrick J. Wong 2020-01-13 16:33:46 -08:00
parent b7df5e9205
commit 8a6453a89d
3 changed files with 24 additions and 0 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

17
fs/xfs/xfs_buf_item.c
View File

@ -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)

1
fs/xfs/xfs_buf_item.h
View File

@ -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;

6
fs/xfs/xfs_log_recover.c
View File

@ -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.
*/