Stream: git-wasmtime

Topic: wasmtime / Issue #2008 Symlink check makes WASI unusable ...

Wasmtime GitHub notifications bot (Jul 10 2020 at 14:24):

whitequark opened Issue #2008:

I'm trying to debug another wasmtime misbehavior (it seems that under Windows and Windows only it does not truncate existing files) under wine. I cannot use wasmtime to write to an existing file because it has a symlink check, which always fails if the file exists:

 DEBUG wasi_common::path                              > path_get cur_path = "foo.json"
 DEBUG wasi_common::path                              > path_get path_stack = []
 DEBUG wasi_common::sys::windows::path                > out_path="Z:\\home\\whitequark\\xxx\\build\\foo.json"
 DEBUG wasi_common::sys::windows::path                > readlinkat error=50
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > error=Notsup
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > wiggle abi; module="wasi_snapshot_preview1" function="fd_write"
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > fd=Fd(1) iovs=*guest 0x6003f0/2
ERROR: Can't open output file `foo.json' for writing: Not supported
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > nwritten=68
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > success=No error occurred. System call completed successfully. (Errno::Success(0))

Wasmtime GitHub notifications bot (Jul 10 2020 at 14:24):

whitequark labeled Issue #2008:

I'm trying to debug another wasmtime misbehavior (it seems that under Windows and Windows only it does not truncate existing files) under wine. I cannot use wasmtime to write to an existing file because it has a symlink check, which always fails if the file exists:

 DEBUG wasi_common::path                              > path_get cur_path = "foo.json"
 DEBUG wasi_common::path                              > path_get path_stack = []
 DEBUG wasi_common::sys::windows::path                > out_path="Z:\\home\\whitequark\\xxx\\build\\foo.json"
 DEBUG wasi_common::sys::windows::path                > readlinkat error=50
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > error=Notsup
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > wiggle abi; module="wasi_snapshot_preview1" function="fd_write"
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > fd=Fd(1) iovs=*guest 0x6003f0/2
ERROR: Can't open output file `foo.json' for writing: Not supported
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > nwritten=68
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > success=No error occurred. System call completed successfully. (Errno::Success(0))

Wasmtime GitHub notifications bot (Jul 10 2020 at 14:41):

whitequark commented on Issue #2008:

Seems this could fix it?

diff --git a/crates/wasi-common/src/sys/windows/path.rs b/crates/wasi-common/src/sys/windows/path.rs
index 50a234474..79e0df7f1 100644
--- a/crates/wasi-common/src/sys/windows/path.rs
+++ b/crates/wasi-common/src/sys/windows/path.rs
@@ -139,6 +139,9 @@ pub(crate) fn readlinkat(dirfd: &OsDir, s_path: &str) -> Result<String> {
     };
     if let Some(code) = err.raw_os_error() {
         log::debug!("readlinkat error={:?}", code);
+        if code as u32 == winerror::ERROR_NOT_SUPPORTED {
+            return Err(Errno::Inval);
+        }
         if code as u32 == winerror::ERROR_INVALID_NAME {
             if s_path.ends_with('/') {
                 // strip "/" and check if exists

Wasmtime GitHub notifications bot (Jul 10 2020 at 14:54):

abrown labeled Issue #2008:

I'm trying to debug another wasmtime misbehavior (it seems that under Windows and Windows only it does not truncate existing files) under wine. I cannot use wasmtime to write to an existing file because it has a symlink check, which always fails if the file exists:

 DEBUG wasi_common::path                              > path_get cur_path = "foo.json"
 DEBUG wasi_common::path                              > path_get path_stack = []
 DEBUG wasi_common::sys::windows::path                > out_path="Z:\\home\\whitequark\\xxx\\build\\foo.json"
 DEBUG wasi_common::sys::windows::path                > readlinkat error=50
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > error=Notsup
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > wiggle abi; module="wasi_snapshot_preview1" function="fd_write"
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > fd=Fd(1) iovs=*guest 0x6003f0/2
ERROR: Can't open output file `foo.json' for writing: Not supported
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > nwritten=68
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > success=No error occurred. System call completed successfully. (Errno::Success(0))

Wasmtime GitHub notifications bot (Jul 10 2020 at 14:54):

abrown labeled Issue #2008:

I'm trying to debug another wasmtime misbehavior (it seems that under Windows and Windows only it does not truncate existing files) under wine. I cannot use wasmtime to write to an existing file because it has a symlink check, which always fails if the file exists:

 DEBUG wasi_common::path                              > path_get cur_path = "foo.json"
 DEBUG wasi_common::path                              > path_get path_stack = []
 DEBUG wasi_common::sys::windows::path                > out_path="Z:\\home\\whitequark\\xxx\\build\\foo.json"
 DEBUG wasi_common::sys::windows::path                > readlinkat error=50
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > error=Notsup
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > wiggle abi; module="wasi_snapshot_preview1" function="fd_write"
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > fd=Fd(1) iovs=*guest 0x6003f0/2
ERROR: Can't open output file `foo.json' for writing: Not supported
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > nwritten=68
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > success=No error occurred. System call completed successfully. (Errno::Success(0))

Wasmtime GitHub notifications bot (Jul 10 2020 at 14:54):

github-actions[bot] commented on Issue #2008:

Subscribe to Label Action

cc @kubkon

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This issue or pull request has been labeled: "wasi"

Thus the following users have been cc'd because of the following labels:

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Wasmtime GitHub notifications bot (Mar 20 2021 at 17:59):

bjorn3 commented on Issue #2008:

Is this still the case after the rewrite of the wasi implementation?

Wasmtime GitHub notifications bot (Mar 21 2021 at 21:49):

pchickey commented on Issue #2008:

All of that path resolution code has been completely rewritten, it now resides in cap-std and has a different design than before. However, I don't think I have enough information to reproduce these bugs and check. @whitequark can you provide a bit more context?

Wasmtime GitHub notifications bot (Mar 21 2021 at 23:37):

whitequark commented on Issue #2008:

I'm going to try to reproduce this and comment with the steps as well as close the issue if it's fixed.

Wasmtime GitHub notifications bot (Mar 24 2021 at 10:03):

whitequark commented on Issue #2008:

This is no longer an issue on main :tada:

Wasmtime GitHub notifications bot (Mar 24 2021 at 10:03):

whitequark closed Issue #2008:

I'm trying to debug another wasmtime misbehavior (it seems that under Windows and Windows only it does not truncate existing files) under wine. I cannot use wasmtime to write to an existing file because it has a symlink check, which always fails if the file exists:

 DEBUG wasi_common::path                              > path_get cur_path = "foo.json"
 DEBUG wasi_common::path                              > path_get path_stack = []
 DEBUG wasi_common::sys::windows::path                > out_path="Z:\\home\\whitequark\\xxx\\build\\foo.json"
 DEBUG wasi_common::sys::windows::path                > readlinkat error=50
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > error=Notsup
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > wiggle abi; module="wasi_snapshot_preview1" function="fd_write"
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > fd=Fd(1) iovs=*guest 0x6003f0/2
ERROR: Can't open output file `foo.json' for writing: Not supported
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > nwritten=68
 TRACE wasi_common::wasi::wasi_snapshot_preview1      > success=No error occurred. System call completed successfully. (Errno::Success(0))

Last updated: Dec 23 2024 at 12:05 UTC