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[XFS] Fix xfs_bulkstat_one size checks & error handling 

The 32-bit xfs_blkstat_one handler was failing because
a size check checked whether the remaining (32-bit)
user buffer was less than the (64-bit) bulkstat buffer,
and failed with ENOMEM if so.  Move this check
into the respective handlers so that they check the
correct sizes.

Also, the formatters were returning negative errors
or positive bytes copied; this was odd in the positive
error value world of xfs, and handled wrong by at least
some of the callers, which treated the bytes returned
as an error value.  Move the bytes-used assignment
into the formatters.

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
This commit is contained in:
sandeen@sandeen.net 2008-11-25 21:20:12 -06:00 committed by Lachlan McIlroy
parent 2ee4fa5cb7
commit 65fbaf2489
3 changed files with 39 additions and 28 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

44
fs/xfs/linux-2.6/xfs_ioctl32.c
View File

@ -192,35 +192,43 @@ xfs_bstime_store_compat(
return 0;
}
/* Return 0 on success or positive error (to xfs_bulkstat()) */
STATIC int
xfs_bulkstat_one_fmt_compat(
void __user *ubuffer,
int ubsize,
int *ubused,
const xfs_bstat_t *buffer)
{
compat_xfs_bstat_t __user *p32 = ubuffer;
if (put_user(buffer->bs_ino, &p32->bs_ino) ||
put_user(buffer->bs_mode, &p32->bs_mode) ||
put_user(buffer->bs_nlink, &p32->bs_nlink) ||
put_user(buffer->bs_uid, &p32->bs_uid) ||
put_user(buffer->bs_gid, &p32->bs_gid) ||
put_user(buffer->bs_rdev, &p32->bs_rdev) ||
put_user(buffer->bs_blksize, &p32->bs_blksize) ||
put_user(buffer->bs_size, &p32->bs_size) ||
if (ubsize < sizeof(*p32))
return XFS_ERROR(ENOMEM);
if (put_user(buffer->bs_ino, &p32->bs_ino) ||
put_user(buffer->bs_mode, &p32->bs_mode) ||
put_user(buffer->bs_nlink, &p32->bs_nlink) ||
put_user(buffer->bs_uid, &p32->bs_uid) ||
put_user(buffer->bs_gid, &p32->bs_gid) ||
put_user(buffer->bs_rdev, &p32->bs_rdev) ||
put_user(buffer->bs_blksize, &p32->bs_blksize) ||
put_user(buffer->bs_size, &p32->bs_size) ||
xfs_bstime_store_compat(&p32->bs_atime, &buffer->bs_atime) ||
xfs_bstime_store_compat(&p32->bs_mtime, &buffer->bs_mtime) ||
xfs_bstime_store_compat(&p32->bs_ctime, &buffer->bs_ctime) ||
put_user(buffer->bs_blocks, &p32->bs_blocks) ||
put_user(buffer->bs_xflags, &p32->bs_xflags) ||
put_user(buffer->bs_extsize, &p32->bs_extsize) ||
put_user(buffer->bs_extents, &p32->bs_extents) ||
put_user(buffer->bs_gen, &p32->bs_gen) ||
put_user(buffer->bs_projid, &p32->bs_projid) ||
put_user(buffer->bs_dmevmask, &p32->bs_dmevmask) ||
put_user(buffer->bs_dmstate, &p32->bs_dmstate) ||
put_user(buffer->bs_blocks, &p32->bs_blocks) ||
put_user(buffer->bs_xflags, &p32->bs_xflags) ||
put_user(buffer->bs_extsize, &p32->bs_extsize) ||
put_user(buffer->bs_extents, &p32->bs_extents) ||
put_user(buffer->bs_gen, &p32->bs_gen) ||
put_user(buffer->bs_projid, &p32->bs_projid) ||
put_user(buffer->bs_dmevmask, &p32->bs_dmevmask) ||
put_user(buffer->bs_dmstate, &p32->bs_dmstate) ||
put_user(buffer->bs_aextents, &p32->bs_aextents))
return -XFS_ERROR(EFAULT);
return sizeof(*p32);
return XFS_ERROR(EFAULT);
if (ubused)
*ubused = sizeof(*p32);
return 0;
}
STATIC int

21
fs/xfs/xfs_itable.c
View File

@ -188,14 +188,21 @@ xfs_bulkstat_one_dinode(
}
}
/* Return 0 on success or positive error */
STATIC int
xfs_bulkstat_one_fmt(
void __user *ubuffer,
int ubsize,
int *ubused,
const xfs_bstat_t *buffer)
{
if (ubsize < sizeof(*buffer))
return XFS_ERROR(ENOMEM);
if (copy_to_user(ubuffer, buffer, sizeof(*buffer)))
return -EFAULT;
return sizeof(*buffer);
return XFS_ERROR(EFAULT);
if (ubused)
*ubused = sizeof(*buffer);
return 0;
}
/*
@ -223,8 +230,6 @@ xfs_bulkstat_one_int(
if (!buffer || xfs_internal_inum(mp, ino))
return XFS_ERROR(EINVAL);
if (ubsize < sizeof(*buf))
return XFS_ERROR(ENOMEM);
buf = kmem_alloc(sizeof(*buf), KM_SLEEP);
@ -239,15 +244,11 @@ xfs_bulkstat_one_int(
xfs_bulkstat_one_dinode(mp, ino, dip, buf);
}
error = formatter(buffer, buf);
if (error < 0) {
error = EFAULT;
error = formatter(buffer, ubsize, ubused, buf);
if (error)
goto out_free;
}
*stat = BULKSTAT_RV_DIDONE;
if (ubused)
*ubused = error;
out_free:
kmem_free(buf);

2
fs/xfs/xfs_itable.h
View File

@ -71,6 +71,8 @@ xfs_bulkstat_single(
typedef int (*bulkstat_one_fmt_pf)( /* used size in bytes or negative error */
void __user *ubuffer, /* buffer to write to */
int ubsize, /* remaining user buffer sz */
int *ubused, /* bytes used by formatter */
const xfs_bstat_t *buffer); /* buffer to read from */
int