[PATCH] vfs_glusterfs: Make sure posix acls are formatted "before setting"/"after getting"
Andrew Bartlett
abartlet at samba.org
Fri Aug 9 18:44:37 MDT 2013
On Fri, 2013-08-09 at 17:50 -0500, Christopher R. Hertel wrote:
> I've updated the patch (fixed the formatting to meet Samba standards).
> +1 for the attached.
>
> Need one more approval so that I can commit.
Reviewed-by: Andrew Bartlett <abartlet at samba.org>
This happened because we swapped out the use of the libc ACL <-> xattr
code at the last moment.
I'm surprised the normalised form is little, not big endian (network
byte order), but I'll take that much on trust.
> Chris -)-----
>
> On 08/07/2013 10:13 AM, Raghavendra Talur wrote:
> >
> >
> >
> > vfs_glusterfs: format acls and xattr correctly
> >
> > 1. In case of setting acls
> > The format to set acls using xattr by setxattr call
> > prescribes the acl entries to be in little endian format.
> > This patch converts the values to little endian.
> >
> > 2. In case of getting acls
> > As acl entries are always stored in little endian byte order,
> > we have to convert the data to cpu's native byte order before
> > using it.
> >
> > I have attached the patch.
> >
> >>From 877534ac5f98cb3aff57151c0aea754bfb078e65 Mon Sep 17 00:00:00 2001
> > From: Raghavendra Talur <rtalur at redhat.com>
> > Date: Wed, 7 Aug 2013 18:22:29 +0530
> > Subject: [PATCH] vfs_glusterfs: format acls and xattr correctly
> >
> > 1. In case of setting acls
> > The format to set acls using xattr by setxattr call
> > prescribes the acl entries to be in little endian format.
> > This patch converts the values to little endian.
> >
> > 2. In case of getting acls
> > As acl entries are always stored in little endian byte order,
> > we have to convert the data to cpu's native byte order before
> > using it.
> >
> > Signed-off-by: Raghavendra Talur <rtalur at redhat.com>
> > ---
> > source3/modules/vfs_glusterfs.c | 58 +++++++++++++++++++++++++++++++++++------
> > 1 file changed, 50 insertions(+), 8 deletions(-)
> >
> > diff --git a/source3/modules/vfs_glusterfs.c b/source3/modules/vfs_glusterfs.c
> > index 1323e0e..39e9b9f 100644
> > --- a/source3/modules/vfs_glusterfs.c
> > +++ b/source3/modules/vfs_glusterfs.c
> > @@ -1023,6 +1023,45 @@ struct gluster_acl_header {
> > struct gluster_ace entries[];
> > };
> >
> > +static int gluster_ace_cmp (const void *val1, const void *val2)
> > +{
> > + const struct gluster_ace *ace1 = NULL;
> > + const struct gluster_ace *ace2 = NULL;
> > + int ret = 0;
> > +
> > + ace1 = val1;
> > + ace2 = val2;
> > +
> > + ret = (ace1->tag - ace2->tag);
> > + if (!ret)
> > + ret = (ace1->id - ace2->id);
> > +
> > + return ret;
> > +}
> > +
> > +static void gluster_acl_normalize (struct gluster_acl_header *acl, int count)
> > +{
> > + qsort (acl->entries, count, sizeof (struct gluster_ace *),
> > + gluster_ace_cmp);
> > +}
> > +
> > +static void gluster_acl_to_xattr (struct gluster_acl_header *acl, int count)
> > +{
> > + struct gluster_ace *ace;
> > + int i;
> > +
> > + ace = acl->entries;
> > +
> > + SIVAL(&acl->version, 0, acl->version);
> > +
> > + for (i = 0; i < count; i++) {
> > + SSVAL(&ace->tag, 0, ace->tag);
> > + SSVAL(&ace->perm, 0, ace->perm);
> > + SIVAL(&ace->id, 0, ace->id);
> > + ace++;
> > + }
> > +}
> > +
> > static SMB_ACL_T gluster_to_smb_acl(const char *buf, size_t xattr_size,
> > TALLOC_CTX *mem_ctx)
> > {
> > @@ -1059,9 +1098,9 @@ static SMB_ACL_T gluster_to_smb_acl(const char *buf, size_t xattr_size,
> >
> > hdr = (void *)buf;
> >
> > - if (ntohl(hdr->version) != GLUSTER_ACL_VERSION) {
> > + if (GLUSTER_ACL_VERSION != IVAL(&hdr->version, 0)) {
> > DEBUG(0, ("Unknown gluster ACL version: %d\n",
> > - ntohl(hdr->version)));
> > + IVAL(&hdr->version, 0)));
> > return NULL;
> > }
> >
> > @@ -1084,7 +1123,7 @@ static SMB_ACL_T gluster_to_smb_acl(const char *buf, size_t xattr_size,
> > ace = hdr->entries;
> >
> > for (i = 0; i < count; i++) {
> > - tag = ntohs(ace->tag);
> > + tag = SVAL(&ace->tag, 0);
> >
> > switch(tag) {
> > case GLUSTER_ACL_USER:
> > @@ -1110,7 +1149,7 @@ static SMB_ACL_T gluster_to_smb_acl(const char *buf, size_t xattr_size,
> > return NULL;
> > }
> >
> > - id = ntohl(ace->id);
> > + id = IVAL(&ace->id, 0);
> >
> > switch(smb_ace->a_type) {
> > case SMB_ACL_USER:
> > @@ -1123,7 +1162,7 @@ static SMB_ACL_T gluster_to_smb_acl(const char *buf, size_t xattr_size,
> > break;
> > }
> >
> > - perm = ntohs(ace->perm);
> > + perm = SVAL(&ace->perm, 0);
> >
> > smb_ace->a_perm = 0;
> > smb_ace->a_perm |=
> > @@ -1169,7 +1208,7 @@ static ssize_t smb_to_gluster_acl(SMB_ACL_T theacl, char *buf, size_t len)
> > ace = hdr->entries;
> > smb_ace = theacl->acl;
> >
> > - hdr->version = htonl(GLUSTER_ACL_VERSION);
> > + hdr->version = GLUSTER_ACL_VERSION;
> >
> > for (i = 0; i < count; i++) {
> > switch(smb_ace->a_type) {
> > @@ -1198,7 +1237,7 @@ static ssize_t smb_to_gluster_acl(SMB_ACL_T theacl, char *buf, size_t len)
> > return -1;
> > }
> >
> > - ace->tag = ntohs(tag);
> > + ace->tag = tag;
> >
> > switch(smb_ace->a_type) {
> > case SMB_ACL_USER:
> > @@ -1212,7 +1251,7 @@ static ssize_t smb_to_gluster_acl(SMB_ACL_T theacl, char *buf, size_t len)
> > break;
> > }
> >
> > - ace->id = ntohl(id);
> > + ace->id = id;
> >
> > ace->perm = 0;
> > ace->perm |=
> > @@ -1226,6 +1265,9 @@ static ssize_t smb_to_gluster_acl(SMB_ACL_T theacl, char *buf, size_t len)
> > smb_ace++;
> > }
> >
> > + gluster_acl_normalize (hdr, count);
> > + gluster_acl_to_xattr (hdr, count);
> > +
> > return size;
> > }
> >
>
--
Andrew Bartlett http://samba.org/~abartlet/
Authentication Developer, Samba Team http://samba.org
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