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xfs: namecheck directory entry names before listing them

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Actually call namecheck on directory entry names before we hand them
over to userspace.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Brian Foster <bfoster@redhat.com>
This commit is contained in:
Darrick J. Wong 2019-10-28 16:12:34 -07:00
parent 16c6e92c7e
commit 04df34ac64
1 changed files with 22 additions and 5 deletions
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27
fs/xfs/xfs_dir2_readdir.c
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@ -17,6 +17,7 @@
#include "xfs_trace.h"
#include "xfs_bmap.h"
#include "xfs_trans.h"
#include "xfs_error.h"
/*
* Directory file type support functions
@ -115,6 +116,11 @@ xfs_dir2_sf_getdents(
ino = dp->d_ops->sf_get_ino(sfp, sfep);
filetype = dp->d_ops->sf_get_ftype(sfep);
ctx->pos = off & 0x7fffffff;
if (!xfs_dir2_namecheck(sfep->name, sfep->namelen)) {
XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW,
dp->i_mount);
return -EFSCORRUPTED;
}
if (!dir_emit(ctx, (char *)sfep->name, sfep->namelen, ino,
xfs_dir3_get_dtype(dp->i_mount, filetype)))
return 0;
@ -208,12 +214,16 @@ xfs_dir2_block_getdents(
/*
* If it didn't fit, set the final offset to here & return.
*/
if (!xfs_dir2_namecheck(dep->name, dep->namelen)) {
XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW,
dp->i_mount);
error = -EFSCORRUPTED;
goto out_rele;
}
if (!dir_emit(ctx, (char *)dep->name, dep->namelen,
be64_to_cpu(dep->inumber),
xfs_dir3_get_dtype(dp->i_mount, filetype))) {
xfs_trans_brelse(args->trans, bp);
return 0;
}
xfs_dir3_get_dtype(dp->i_mount, filetype)))
goto out_rele;
}
/*
@ -222,8 +232,9 @@ xfs_dir2_block_getdents(
*/
ctx->pos = xfs_dir2_db_off_to_dataptr(geo, geo->datablk + 1, 0) &
0x7fffffff;
out_rele:
xfs_trans_brelse(args->trans, bp);
return 0;
return error;
}
/*
@ -456,6 +467,12 @@ xfs_dir2_leaf_getdents(
filetype = dp->d_ops->data_get_ftype(dep);
ctx->pos = xfs_dir2_byte_to_dataptr(curoff) & 0x7fffffff;
if (!xfs_dir2_namecheck(dep->name, dep->namelen)) {
XFS_ERROR_REPORT(__func__, XFS_ERRLEVEL_LOW,
dp->i_mount);
error = -EFSCORRUPTED;
break;
}
if (!dir_emit(ctx, (char *)dep->name, dep->namelen,
be64_to_cpu(dep->inumber),
xfs_dir3_get_dtype(dp->i_mount, filetype)))