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Get a pathref handle on the file system root. This will serve as
"basedir" for filename_convert_dirfsp_rel() to turn an absolute path
into one relative to the handle created here.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Soon we'll have a caller that needs the last component as a relative
file name. Make sure it does not have to call get_lcomp or so.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Unused so far, but soon we'll call this routine with a basedir that's
somewhere below the share root.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This avoids a full path traversal if /proc/self/fd is available.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Use the /proc/self/fd trick to make get_real_filename_fullscan_at look
a bit nicer and faster in strace. Direct SMB_VFS_OPENAT also is
cheaper in user space, we don't need the full fd_openat and
non_widelink_open magic here.
Also avoid opening ".", which can fail where a full path open would
succeed: If the directory in question does not give "x" perms to the
user, we get a handle on the dir as such but can't cd into it.
I haven't seen real-world cases of this, but one of our tests creates
such a scenario. I have further refactoring in my local tree that make
this patch necessary.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
So far fd_openat needed to be called with cwd_fsp and "." if you
wanted to open the share root, this enables using the absolute share
path. The next patch will remove sending the "." with cwd_fsp as a
simplification. Enable that with this little change.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Make it clear that non_widelink_open being called for absolute paths
is not done during regular operations, i.e. when we have passed our
pathnames through filename_convert_dirfsp and we work on a real
dirfsp.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
We can't deal with snapdir paths in non_widelink_open fully with
snapdirseverywhere active: There is no way for
shadow_copy2_parent_pathname() to work when a snapshot directory is
below the directory that we want to calculate the parent for. What is
the parent directory supposed to point at? I don't know.
For me the only way out is to accept that we should ignore what
happens behind shadow_copy2's path manipulation in core
smbd. This *might* open symlink races, but the whole point of
snapshots is that they are r/o copies of the real active file system
and as such they should be immune to those races.
Found while trying to refactor code around fd_openat()
P.S: This code will go away pretty soon
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
If we do the S_ISLNK check in the lower level, the if-condition is
simpler and we get the close_file_free() call for free.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This is always a bug, we should never do this. In one iteration of my
code I was doing this, which led to an invalid fallback code, which
itself lead to an infinite recursion. Make this more obvious with an
assert.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Tue Nov 12 15:13:03 UTC 2024 on atb-devel-224
openat(-1, "relative path", ..) is invalid. I've tried to also tighten
this down to just relative paths (i.e. base_name[0] != '/'), but
non_widelink_open makes modifications further down that make this more
difficult.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
A valid tcon will have changed fsp_get_pathref_fd() to AT_FDCWD, -100
on Linux.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
The next patch will add another excluding condition, this change
keeps the if-condition that is changed here simple.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
vfs_GetWd depends upon a current tcon in fake_acls, otherwise it will
call openat with an invalid dirfd on a relative pathname.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
We have to undo the fsp allocation and open we've done. Not noticed,
it's probably highly unlikely OpenDir_fsp() fails.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Ralph Böhme <slow@samba.org>
Autobuild-Date(master): Tue Nov 12 13:26:10 UTC 2024 on atb-devel-224
Use reopen_from_fsp(), this will use the /proc/self/fd/<fd> trick if
available, no need to go through non_widelink_open
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This emulates openat, and trying to open a non-existing file should
result in ENOENT and not ENOATTR
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This function is pretty simple, this avoids a few calls to
map_errno_from_nt_status in the callers
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Inspired by Coverity finding CID 1609584 Overflowed constant -- not
sure it fixes it.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
This is an addition without an overflow check. Do it right there.
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Consolidate saving/replacing ndr->offset right around the push_uint32
Signed-off-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Signed-off-by: Thomas Klausner <wiz@gatalith.at>
Reviewed-by: Volker Lendecke <vl@samba.org>
Reviewed-by: Ralph Boehme <slow@samba.org>
Autobuild-User(master): Volker Lendecke <vl@samba.org>
Autobuild-Date(master): Mon Nov 11 16:47:46 UTC 2024 on atb-devel-224
