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fix(runtime-core) Remove a panic when generating globals with a corrupted module #995

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merged 4 commits into from
Nov 21, 2019

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Hywan
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@Hywan Hywan commented Nov 21, 2019

Fix #979.

When we try to get a global that doesn't exist, a panic is
generated. This patch skips such panic and let a proper error be
generated.

Before this patch:

$ cargo run -- run panic_index_oob_all_backends.wasm
panic

With this patch:

$ cargo run -- run panic_index_oob_all_backends.wasm
Error: Can't instantiate module: LinkError([Generic { message: "Trying to read the `0` global that isn\'t properly initialized." }])

Fix wasmerio#979.

When we try to get a global that doesn't exist, a panic is
generated. This patch just skip that path, and let a proper error be
generated later.

With this patch, we get:

```sh
$ cargo run -- run panic_index_oob_all_backends.wasm
Error: ExportNotFound { name: "main" }
```

which is kind of the expected behavior in such situation.
Before this patch:

```
$ cargo run -- run panic_index_oob_all_backends.wasm
Error: ExportNotFound { name: "main" }
```

With this patch:

```sh
$ cargo run -- run panic_index_oob_all_backends.wasm
Error: Can't instantiate module: LinkError([Generic { message: "Trying to read the `0` global that isn\'t properly initialized." }])
```
@Hywan Hywan added bug Something isn't working 📦 lib-deprecated About the deprecated crates labels Nov 21, 2019
@Hywan Hywan requested a review from bjfish as a code owner November 21, 2019 10:00
@Hywan Hywan changed the title fix(runtime-core) Fix a panic when generating globals with a corrupted module fix(runtime-core) Remove a panic when generating globals with a corrupted module Nov 21, 2019
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Hywan commented Nov 21, 2019

bors try

bors bot added a commit that referenced this pull request Nov 21, 2019
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bors bot commented Nov 21, 2019

try

Build succeeded

@syrusakbary
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bors r+

bors bot added a commit that referenced this pull request Nov 21, 2019
995: fix(runtime-core) Remove a panic when generating globals with a corrupted module r=syrusakbary a=Hywan

Fix #979.

When we try to get a global that doesn't exist, a panic is
generated. This patch skips such panic and let a proper error be
generated.

Before this patch:

```
$ cargo run -- run panic_index_oob_all_backends.wasm
Error: ExportNotFound { name: "main" }
```

With this patch:

```sh
$ cargo run -- run panic_index_oob_all_backends.wasm
Error: Can't instantiate module: LinkError([Generic { message: "Trying to read the `0` global that isn\'t properly initialized." }])
```

Co-authored-by: Ivan Enderlin <[email protected]>
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bors bot commented Nov 21, 2019

Build succeeded

@bors bors bot merged commit 7313672 into wasmerio:master Nov 21, 2019
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[wasmer all backends] index OOB panic in LocalBacking::generate_globals
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