Pali Rohár 723f4ef904 cifs: Fix parsing native symlinks relative to the export ... SMB symlink which has SYMLINK_FLAG_RELATIVE set is relative (as opposite of the absolute) and it can be relative either to the current directory (where is the symlink stored) or relative to the top level export path. To what it is relative depends on the first character of the symlink target path. If the first character is path separator then symlink is relative to the export, otherwise to the current directory. Linux (and generally POSIX systems) supports only symlink paths relative to the current directory where is symlink stored. Currently if Linux SMB client reads relative SMB symlink with first character as path separator (slash), it let as is. Which means that Linux interpret it as absolute symlink pointing from the root (/). But this location is different than the top level directory of SMB export (unless SMB export was mounted to the root) and thefore SMB symlinks relative to the export are interpreted wrongly by Linux SMB client. Fix this problem. As Linux does not have equivalent of the path relative to the top of the mount point, convert such symlink target path relative to the current directory. Do this by prepending "../" pattern N times before the SMB target path, where N is the number of path separators found in SMB symlink path. So for example, if SMB share is mounted to Linux path /mnt/share/, symlink is stored in file /mnt/share/test/folder1/symlink (so SMB symlink path is test\folder1\symlink) and SMB symlink target points to \test\folder2\file, then convert symlink target path to Linux path ../../test/folder2/file. Deduplicate code for parsing SMB symlinks in native form from functions smb2_parse_symlink_response() and parse_reparse_native_symlink() into new function smb2_parse_native_symlink() and pass into this new function a new full_path parameter from callers, which specify SMB full path where is symlink stored. This change fixes resolving of the native Windows symlinks relative to the top level directory of the SMB share. Signed-off-by: Pali Rohár <pali@kernel.org> Signed-off-by: Steve French <stfrench@microsoft.com>		2024-11-25 14:50:32 -06:00
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client	cifs: Fix parsing native symlinks relative to the export	2024-11-25 14:50:32 -06:00
common	smb: Update comments about some reparse point tags	2024-09-29 17:28:40 -05:00
server	ksmbd: check outstanding simultaneous SMB operations	2024-11-05 09:26:38 +09:00
Kconfig	smb: move client and server files to common directory fs/smb	2023-05-24 16:29:21 -05:00
Makefile	smb: move client and server files to common directory fs/smb	2023-05-24 16:29:21 -05:00