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[PATCH] FUSE: pass file handle in setattr

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This patch passes the file handle supplied in iattr to userspace, in case the
->setattr() was invoked from sys_ftruncate().  This solves the permission
checking (or lack thereof) in ftruncate() for the class of filesystems served
by an unprivileged userspace process.

Signed-off-by: Miklos Szeredi <miklos@szeredi.hu>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Miklos Szeredi 2005-11-07 00:59:52 -08:00 committed by Linus Torvalds
parent fd72faac95
commit befc649c22
2 changed files with 29 additions and 15 deletions
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28
fs/fuse/dir.c
View File

@ -763,29 +763,29 @@ static int fuse_dir_fsync(struct file *file, struct dentry *de, int datasync)
return file ? fuse_fsync_common(file, de, datasync, 1) : 0;
}
static unsigned iattr_to_fattr(struct iattr *iattr, struct fuse_attr *fattr)
static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg)
{
unsigned ivalid = iattr->ia_valid;
unsigned fvalid = 0;
memset(fattr, 0, sizeof(*fattr));
if (ivalid & ATTR_MODE)
fvalid |= FATTR_MODE, fattr->mode = iattr->ia_mode;
arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode;
if (ivalid & ATTR_UID)
fvalid |= FATTR_UID, fattr->uid = iattr->ia_uid;
arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid;
if (ivalid & ATTR_GID)
fvalid |= FATTR_GID, fattr->gid = iattr->ia_gid;
arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid;
if (ivalid & ATTR_SIZE)
fvalid |= FATTR_SIZE, fattr->size = iattr->ia_size;
arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size;
/* You can only _set_ these together (they may change by themselves) */
if ((ivalid & (ATTR_ATIME | ATTR_MTIME)) == (ATTR_ATIME | ATTR_MTIME)) {
fvalid |= FATTR_ATIME | FATTR_MTIME;
fattr->atime = iattr->ia_atime.tv_sec;
fattr->mtime = iattr->ia_mtime.tv_sec;
arg->valid |= FATTR_ATIME | FATTR_MTIME;
arg->atime = iattr->ia_atime.tv_sec;
arg->mtime = iattr->ia_mtime.tv_sec;
}
if (ivalid & ATTR_FILE) {
struct fuse_file *ff = iattr->ia_file->private_data;
arg->valid |= FATTR_FH;
arg->fh = ff->fh;
}
return fvalid;
}
static int fuse_setattr(struct dentry *entry, struct iattr *attr)
@ -820,7 +820,7 @@ static int fuse_setattr(struct dentry *entry, struct iattr *attr)
return -EINTR;
memset(&inarg, 0, sizeof(inarg));
inarg.valid = iattr_to_fattr(attr, &inarg.attr);
iattr_to_fattr(attr, &inarg);
req->in.h.opcode = FUSE_SETATTR;
req->in.h.nodeid = get_node_id(inode);
req->inode = inode;

16
include/linux/fuse.h
View File

@ -61,6 +61,7 @@ struct fuse_kstatfs {
#define FATTR_SIZE (1 << 3)
#define FATTR_ATIME (1 << 4)
#define FATTR_MTIME (1 << 5)
#define FATTR_FH (1 << 6)
/**
* Flags returned by the OPEN request
@ -154,7 +155,20 @@ struct fuse_link_in {
struct fuse_setattr_in {
__u32 valid;
__u32 padding;
struct fuse_attr attr;
__u64 fh;
__u64 size;
__u64 unused1;
__u64 atime;
__u64 mtime;
__u64 unused2;
__u32 atimensec;
__u32 mtimensec;
__u32 unused3;
__u32 mode;
__u32 unused4;
__u32 uid;
__u32 gid;
__u32 unused5;
};
struct fuse_open_in {