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Retry operations that have been shown to throw EINTR
errors on CIFS.
Todo: Solution for this pain in the back:
warning: unix.Getdents returned errno 2 in the middle of data
rm: cannot remove 'linux-3.0.old3/Documentation/ABI/removed': Input/output error
Progress towards fixing https://github.com/rfjakob/gocryptfs/issues/483 .
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Instead, use the new toFuseCtx() function introduced
in an earlier commit.
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We need
https://github.com/hanwen/go-fuse/commit/fd7328faf9fdf75709f7ba7df7072aaf4eeb18b3
to fix a crash reported in https://github.com/rfjakob/gocryptfs/issues/430 :
2019/10/30 17:14:16 Unknown opcode 2016
panic: runtime error: invalid memory address or nil pointer dereference
[signal SIGSEGV: segmentation violation code=0x1 addr=0x20 pc=0x508d38]
This patch is only in the v2.x.x branch. Upgrade to v2, as the
old API is also supported there.
Running
git grep hanwen/go-fuse | grep -v hanwen/go-fuse/v2
to check for forgotten references comes back clean.
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Handled the same way in GlusterFS, disorderfs, libfuse.
Fixes https://github.com/rfjakob/gocryptfs/issues/394
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For Linux, everything effectively stays the same. For both path-based and
fd-based Utimens() calls, we use unix.UtimesNanoAt(). To avoid introducing
a separate syscall wrapper for futimens() (as done in go-fuse, for example),
we instead use the /proc/self/fd - trick.
On macOS, this changes quite a lot:
* Path-based Utimens() calls were previously completely broken, since
unix.UtimensNanoAt() ignores the passed file descriptor. Note that this
cannot be fixed easily since there IS no appropriate syscall available on
macOS prior to High Sierra (10.13). We emulate this case by using
Fchdir() + setattrlist().
* Fd-based Utimens() calls were previously translated to f.GetAttr() (to
fill any empty parameters) and syscall.Futimes(), which does not does
support nanosecond precision. Both issues can be fixed by switching to
fsetattrlist().
Fixes https://github.com/rfjakob/gocryptfs/issues/350
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We never want Fchmodat to follow symlinks, so follow what
Qemu does, and call our function FchmodatNofollow.
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Instead of manually adjusting the user after creating the symlink,
adjust effective permissions and let the kernel deal with it.
Related to https://github.com/rfjakob/gocryptfs/issues/338.
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Instead of manually adjusting the user and mode after creating the
device file, adjust effective permissions and let the kernel deal
with it.
Related to https://github.com/rfjakob/gocryptfs/issues/338.
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Revert commit fcaca5fc94d981aa637beb752edc8cb3c2265e96.
Instead of manually adjusting the user and mode after creating the
directory, adjust effective permissions and let the kernel deal with it.
Related to https://github.com/rfjakob/gocryptfs/issues/338.
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Revert commit b22cc03c7516b2003880db8375d26c76d6dff093.
Instead of manually adjusting the user and mode after creating the
file, adjust effective permissions and let the kernel deal with it.
Related to https://github.com/rfjakob/gocryptfs/issues/338.
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Fixes https://github.com/rfjakob/gocryptfs/issues/259
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Check for O_NWFOLLOW and O_EXCL separately to
make the logic clearer.
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This fixes the "0100 directory" problem in reverse mode,
and should be slightly faster.
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These were silently ignored until now (!) but
are rejected by Go 1.11 stdlib.
Drop the flags so the tests work again, until
we figure out a better solution.
https://github.com/golang/go/issues/20130
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O_DIRECT has no direct equivalent on MacOS
(check out https://github.com/libuv/libuv/issues/1600 for details).
Just define it to zero there.
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Now that we have Fstatat we can use it in Getdents to
get rid of the path name.
Also, add an emulated version of getdents for MacOS. This allows
to drop the !HaveGetdents special cases from fusefrontend.
Modify the getdents test to test both native getdents and the emulated
version.
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Fstatat has recently been added to x/sys/unix. Make
it available for use in gocryptfs.
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I'm unsure why I did not notice this earlier, but the
syscall wrappers provided by x/sys/unix seem to do just
fine.
Drop our own version.
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...and fix the instances where the AT_SYMLINK_NOFOLLOW /
O_NOFOLLOW / O_EXCL flag was missing.
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Fixes the same problem as described in 72b975867a3b9bdf53fc2da62e2ba4a328d7e4ab,
except for directories instead of device nodes.
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If the user manages to replace the directory with
a symlink at just the right time, we could be tricked
into chown'ing the wrong file.
This change fixes the race by using fchownat, which
unfortunately is not available on darwin, hence a compat
wrapper is added.
Scenario, as described by @slackner at
https://github.com/rfjakob/gocryptfs/issues/177 :
1. Create a forward mount point with `plaintextnames` enabled
2. Mount as root user with `allow_other`
3. For testing purposes create a file `/tmp/file_owned_by_root`
which is owned by the root user
4. As a regular user run inside of the GoCryptFS mount:
```
mkdir tempdir
mknod tempdir/file_owned_by_root p &
mv tempdir tempdir2
ln -s /tmp tempdir
```
When the steps are done fast enough and in the right order
(run in a loop!), the device file will be created in
`tempdir`, but the `lchown` will be executed by following
the symlink. As a result, the ownership of the file located
at `/tmp/file_owned_by_root` will be changed.
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Dup2 is not implemented on linux/arm64.
Fixes https://github.com/rfjakob/gocryptfs/issues/121 .
Also adds cross-compilation to CI.
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Protip: find naked *at syscalls using:
git grep "syscall." | grep "at(" | grep -v syscallcompat
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Also, replace remaining naked syscall.Openat calls.
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Adds a poor man's renameat implementation for OSX.
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...and convert all calls to syscall.{Fallocate,Openat}
to syscallcompat .
Both syscalls are not available on OSX. We emulate Openat and just
return EOPNOTSUPP for Fallocate.
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We will get more of them as OSX also lacks support for openat.
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