| commit | df37c4b987640849ad2b4033b4f94d7398eceba6 | [log] [tgz] |
|---|---|---|
| author | Didier Spezia <didier.06@gmail.com> | Wed Aug 26 14:27:19 2015 +0000 |
| committer | Rob Pike <r@golang.org> | Wed Sep 02 20:24:40 2015 +0000 |
| tree | 8a1ffa731e4ac0d0fe180f97a8813ddffabbe64b | |
| parent | dc3540d982ade0d50569abd8d054c9c66e2d9d03 [diff] |
cmd/asm: fix several panics with erroneous input The parser tries to read as much information as possible, issuing some errors when needed. Errors generally do not stop the parsing. With some pathological input, it may result in various panics when the error message itself is built, or when the next operand is parsed. It happens while parsing pseudo-instructions. For instance, the following lines all generate a panic: TEXT TEXT% TEXT 1,1 TEXT $"toto", 0, $1 FUNCDATA DATA 0 DATA(0),1 FUNCDATA(SB GLOBL 0, 1 PCDATA 1 Added corresponding tests. Introduced a writer in the parser to capture error messages for testing purpose. It defaults to os.Stderr. Added an explicit check when symbol names cannot be displayed. Interrupted parsing early when the number of operands is wrong for pseudo-instructions. Note that the last point is a change of behavior, because some operands will not get parsed anymore in case of early error. IMO, it is acceptable, because only the first error of the line is considered anyway. If it is not acceptable, it can probably be improved at the price of a more verbose CL. Fixes #11765 Fixes #11760 Fixes #11759 Change-Id: I9602a848132e358a1bccad794d7555e0823970dd Reviewed-on: https://go-review.googlesource.com/13925 Reviewed-by: Rob Pike <r@golang.org>
Go is an open source programming language that makes it easy to build simple, reliable, and efficient software.
For documentation about how to install and use Go, visit https://golang.org/ or load doc/install-source.html in your web browser.
Our canonical Git repository is located at https://go.googlesource.com/go. There is a mirror of the repository at https://github.com/golang/go.
Please report issues here: https://golang.org/issue/new
Go is the work of hundreds of contributors. We appreciate your help!
To contribute, please read the contribution guidelines: https://golang.org/doc/contribute.html
Unless otherwise noted, the Go source files are distributed under the BSD-style license found in the LICENSE file.
If you have just untarred a binary Go distribution, you need to set the environment variable $GOROOT to the full path of the go directory (the one containing this file). You can omit the variable if you unpack it into /usr/local/go, or if you rebuild from sources by running all.bash (see doc/install-source.html). You should also add the Go binary directory $GOROOT/bin to your shell's path.
For example, if you extracted the tar file into $HOME/go, you might put the following in your .profile:
export GOROOT=$HOME/go export PATH=$PATH:$GOROOT/bin
See https://golang.org/doc/install or doc/install.html for more details.