From: "Darrick J. Wong" darrick.wong@oracle.com
mainline inclusion from mainline-v5.5-rc1 commit 04df34ac6494b216a911c5571bf4ee299cd34164 category: bugfix bugzilla: https://gitee.com/openeuler/kernel/issues/I5BDCU CVE: NA
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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
Signed-off-by: tangbin tangbin@cmss.chinamobile.com Reviewed-by: Lihong Kou koulihong@huawei.com Reviewed-by: Xuenan Guo guoxuenan@huawei.com Signed-off-by: Laibin Qiu qiulaibin@huawei.com --- fs/xfs/xfs_dir2_readdir.c | 27 ++++++++++++++++++++++----- 1 file changed, 22 insertions(+), 5 deletions(-)
diff --git a/fs/xfs/xfs_dir2_readdir.c b/fs/xfs/xfs_dir2_readdir.c index 2ae98c272c54..fc389a7f3e1a 100644 --- a/fs/xfs/xfs_dir2_readdir.c +++ b/fs/xfs/xfs_dir2_readdir.c @@ -20,6 +20,7 @@ #include "xfs_trace.h" #include "xfs_bmap.h" #include "xfs_trans.h" +#include "xfs_error.h"
/* * Directory file type support functions @@ -119,6 +120,11 @@ 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(mp, filetype))) return 0; @@ -212,12 +218,16 @@ 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; }
/* @@ -226,8 +236,9 @@ 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; }
/* @@ -460,6 +471,12 @@ 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)))