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    Subject[RFC][PATCH 13/27] elevate mount count for extended attributes
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    Date

    This basically audits the callers of xattr_permission(), which
    calls permission() and can perform writes to the filesystem.

    Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
    ---

    lxc-dave/fs/nfsd/nfs4proc.c | 7 ++++++-
    lxc-dave/fs/xattr.c | 14 ++++++++++++++
    2 files changed, 20 insertions(+), 1 deletion(-)

    diff -puN fs/nfsd/nfs4proc.c~C-xattr fs/nfsd/nfs4proc.c
    --- lxc/fs/nfsd/nfs4proc.c~C-xattr 2006-07-12 11:09:14.000000000 -0700
    +++ lxc-dave/fs/nfsd/nfs4proc.c 2006-07-12 11:09:30.000000000 -0700
    @@ -604,13 +604,18 @@ nfsd4_setattr(struct svc_rqst *rqstp, st
    return status;
    }
    }
    + status = mnt_want_write(current_fh->fh_export->ex_mnt);
    + if (status)
    + return status;
    status = nfs_ok;
    if (setattr->sa_acl != NULL)
    status = nfsd4_set_nfs4_acl(rqstp, current_fh, setattr->sa_acl);
    if (status)
    - return status;
    + goto out;
    status = nfsd_setattr(rqstp, current_fh, &setattr->sa_iattr,
    0, (time_t)0);
    +out:
    + mnt_drop_write(current_fh->fh_export->ex_mnt);
    return status;
    }

    diff -puN fs/xattr.c~C-xattr fs/xattr.c
    --- lxc/fs/xattr.c~C-xattr 2006-07-12 11:09:14.000000000 -0700
    +++ lxc-dave/fs/xattr.c 2006-07-12 11:09:30.000000000 -0700
    @@ -12,6 +12,7 @@
    #include <linux/smp_lock.h>
    #include <linux/file.h>
    #include <linux/xattr.h>
    +#include <linux/mount.h>
    #include <linux/namei.h>
    #include <linux/security.h>
    #include <linux/syscalls.h>
    @@ -210,7 +211,11 @@ sys_setxattr(char __user *path, char __u
    error = user_path_walk(path, &nd);
    if (error)
    return error;
    + error = mnt_want_write(nd.mnt);
    + if (error)
    + return error;
    error = setxattr(nd.dentry, name, value, size, flags);
    + mnt_drop_write(nd.mnt);
    path_release(&nd);
    return error;
    }
    @@ -225,7 +230,11 @@ sys_lsetxattr(char __user *path, char __
    error = user_path_walk_link(path, &nd);
    if (error)
    return error;
    + error = mnt_want_write(nd.mnt);
    + if (error)
    + return error;
    error = setxattr(nd.dentry, name, value, size, flags);
    + mnt_drop_write(nd.mnt);
    path_release(&nd);
    return error;
    }
    @@ -241,9 +250,14 @@ sys_fsetxattr(int fd, char __user *name,
    f = fget(fd);
    if (!f)
    return error;
    + error = mnt_want_write(f->f_vfsmnt);
    + if (error)
    + goto out_fput;
    dentry = f->f_dentry;
    audit_inode(NULL, dentry->d_inode);
    error = setxattr(dentry, name, value, size, flags);
    + mnt_drop_write(f->f_vfsmnt);
    +out_fput:
    fput(f);
    return error;
    }
    _
    -
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