Commit Graph

9 Commits

Author SHA1 Message Date
Sebastian Lackner
5055f39bd5 fusefrontend: Allow to set/remove xattr on directory without read permission.
Setting/removing extended attributes on directories was partially fixed with
commit eff35e60b6. However, on most file systems
it is also possible to do these operations without read access (see tests).

Since we cannot open a write-access fd to a directory, we have to use the
/proc/self/fd trick (already used for ListXAttr) for the other operations aswell.
For simplicity, let's separate the Linux and Darwin code again (basically revert
commit f320b76fd1), and always use the
/proc/self/fd trick on Linux. On Darwin we use the best-effort approach with
openBackingFile() as a fallback.

More discussion about the available options is available in
https://github.com/rfjakob/gocryptfs/issues/308.
2019-01-05 12:34:40 +01:00
Jakob Unterwurzacher
b214be5e3f fusefrontend: xattr: fix operations on files without read permissions
* listxattr is fixed via the /proc/self/fd trick
* setxattr,removexattr are fixed by opening the file O_WRONLY

Fixes https://github.com/rfjakob/gocryptfs/issues/308
2019-01-02 20:48:46 +01:00
Jakob Unterwurzacher
7995a8358e syscallcompat: add Fgetxattr / Fsetxattr wrappers
These take care of buffer sizing and parsing.
2019-01-02 16:56:23 +01:00
Jakob Unterwurzacher
4fae240153 fusefrontend: make Readlink() symlink-safe
Now symlink-safe through Readlinkat().
2019-01-01 16:24:25 +01:00
Jakob Unterwurzacher
1bab400fca Fix three golint warnings
We are clean again.

Warnings were:

internal/fusefrontend/fs.go:443:14: should omit type string from declaration
of var cTarget; it will be inferred from the right-hand side
internal/fusefrontend/xattr.go:26:1: comment on exported method FS.GetXAttr
should be of the form "GetXAttr ..."
internal/syscallcompat/sys_common.go:9:7: exported const PATH_MAX should have
comment or be unexported
2018-06-19 20:16:21 +02:00
Jakob Unterwurzacher
bde7ba57b0 darwin does not have PATH_MAX
Define our own, with the value from Linux.
2018-06-08 00:47:48 +02:00
Sebastian Lackner
a85dbcab38 fusefrontend: Use Linkat syscall to implement Link 2017-12-25 15:07:37 +01:00
Jakob Unterwurzacher
2ceef01afe syscallcompat: add Faccessat
Add faccessat(2) with a hack for symlink, because the
kernel does not actually looks at the passed flags.

From man 2 faccessat:

   C library/kernel differences
       The  raw faccessat() system call takes only the first three argu‐
       ments.  The AT_EACCESS and AT_SYMLINK_NOFOLLOW flags are actually
       implemented  within  the  glibc wrapper function for faccessat().
2017-12-07 00:05:28 +01:00
Jakob Unterwurzacher
f97494e89b syscallcompat: add Readlinkat
We need readlinkat to implement Readlink
symlink-race-free.
2017-12-06 21:07:24 +01:00