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vfs_streams_xattr: restrict which fcntl's are allowed on streams

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BUG: https://bugzilla.samba.org/show_bug.cgi?id=15126
MR: https://gitlab.com/samba-team/samba/-/merge_requests/2643

Signed-off-by: Ralph Boehme <slow@samba.org>
Reviewed-by: Volker Lendecke <vl@samba.org>
(cherry picked from commit 51243e3849736acbbf1d8f52cc02cdec5995fde4)
This commit is contained in:
Ralph Boehme 2022-07-29 07:07:25 +02:00 committed by Jule Anger
parent a3f3f26a6b
commit 82342c7439
1 changed files with 33 additions and 0 deletions
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33
source3/modules/vfs_streams_xattr.c
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@ -1551,6 +1551,38 @@ static bool streams_xattr_strict_lock_check(struct vfs_handle_struct *handle,
return true;
}
static int streams_xattr_fcntl(vfs_handle_struct *handle,
files_struct *fsp,
int cmd,
va_list cmd_arg)
{
va_list dup_cmd_arg;
void *arg;
int ret;
if (fsp_is_alternate_stream(fsp)) {
switch (cmd) {
case F_GETFL:
case F_SETFL:
break;
default:
DBG_ERR("Unsupported fcntl() cmd [%d] on [%s]\n",
cmd, fsp_str_dbg(fsp));
errno = EINVAL;
return -1;
}
}
va_copy(dup_cmd_arg, cmd_arg);
arg = va_arg(dup_cmd_arg, void *);
ret = SMB_VFS_NEXT_FCNTL(handle, fsp, cmd, arg);
va_end(dup_cmd_arg);
return ret;
}
static struct vfs_fn_pointers vfs_streams_xattr_fns = {
.fs_capabilities_fn = streams_xattr_fs_capabilities,
.connect_fn = streams_xattr_connect,
@ -1579,6 +1611,7 @@ static struct vfs_fn_pointers vfs_streams_xattr_fns = {
.kernel_flock_fn = streams_xattr_kernel_flock,
.linux_setlease_fn = streams_xattr_linux_setlease,
.strict_lock_check_fn = streams_xattr_strict_lock_check,
.fcntl_fn = streams_xattr_fcntl,
.fchown_fn = streams_xattr_fchown,
.fchmod_fn = streams_xattr_fchmod,