WebProcess sandboxing does not apply for open source builds on macOS 12.0 (beta 2 and later)

• Component: WebKit2
• Status: RESOLVED FIXED

[Dinesh Kumar Vyas]

WebProcess sandboxing is broken (for local/public builds) on macOS 12.0 (beta 2 and later), causing instant crash/termination of WebProcess.

Root cause:

ENABLE_SANDBOX_MESSAGE_FILTER is NO for non Apple internal builds and we are using 

        (AppleAVDUserClientMessageFilter)
        (IOMobileFramebufferUserClientMessageFilter)
        (IOSurfaceAcceleratorClientMessageFilter)

Which are undefined and causing crash on compiling sb file.

---------------------------------------------------

Logs:

com.apple.WebKit.WebContent.Orion: Could not compile WebContent sandbox: <internal init prelude>:102:28: illegal argument: 
	(internal-strcmp a b #f)

sandbox initialization failed: <internal init prelude>:102:28: illegal argument: 
	(internal-strcmp a b #f)

com.apple.WebKit.WebContent.Orion: Could not initialize sandbox profile [/Volumes/Macintosh HD/Users/Shared/Development/WebKit/WebKit.framework/Resources/com.apple.WebProcess.sb], error '<internal init prelude>:102:28: illegal argument: 
	(internal-strcmp a b #f)
'
ENABLE_SANDBOX_MESSAGE_FILTER=NO
_OS_VERSION=12.0
WEBKIT2_FRAMEWORK_DIR=/Volumes/Macintosh HD/Users/Shared/Development/WebKit
DARWIN_USER_TEMP_DIR=/private/var/folders/98/bhsc41h91w19w4t4p3l_6_240000gp/T/com.apple.WebKit.WebContent
DARWIN_USER_CACHE_DIR=/private/var/folders/98/bhsc41h91w19w4t4p3l_6_240000gp/C/com.apple.WebKit.WebContent
HOME_DIR=/Users/dineshkumarvyas
HOME_LIBRARY_DIR=/Users/dineshkumarvyas/Library
HOME_LIBRARY_PREFERENCES_DIR=/Users/dineshkumarvyas/Library/Preferences
CPU=arm64
com.apple.WebKit.WebContent.Orion: Unable to apply sandbox

[Dinesh Kumar Vyas]

Created attachment 434065 [details]
Patch to fix WebProcess sandboxing issue for open source builds (on macOS 12.0 beta 2 and later)

Added check for USE(APPLE_INTERNAL_SDK) wherever needed as ENABLE_SANDBOX_MESSAGE_FILTER is always NO/false for open source builds and AppleAVDUserClientMessageFilter, IOSurfaceAcceleratorClientMessageFilter and IOMobileFramebufferUserClientMessageFilter are anavailable there which breaks sandbox compilation using sandbox_compile_file

[Saagar Jha]

Created attachment 434204 [details]
Patch

[Saagar Jha]

Here's a slightly different patch that fixes the conditional instead of conditionalizing on USE(APPLE_INTERNAL_SDK). Like the rest of the profile, it duplicates the allow rule and wraps one side in the check for ENABLE_SANDBOX_MESSAGE_FILTER. I was hoping this would do for now, as it matches what the other code looks like, but I'd be interested to see if there was interest for cleaning this up a bit in across all the message filters in a future patch.

[Per Arne Vollan]

Comment on attachment 434204 [details]
Patch

R=me.

[Radar WebKit Bug Importer]

<rdar://problem/81108098>

[EWS]

Committed r280345 (239992@main): <https://commits.webkit.org/239992@main>

All reviewed patches have been landed. Closing bug and clearing flags on attachment 434204 [details].