CONFIG_SHADOW_CALL_STACK=y # CONFIG_SHADOW_CALL_STACK_VMAP is not set # CONFIG_DEBUG_STACK_USAGE is not set
By default, shadow stacks are not virtually allocated to minimize memory overhead, but CONFIG_SHADOW_CALL_STACK_VMAP can be enabled for better stack exhaustion protection. With CONFIG_DEBUG_STACK_USAGE, the kernel will also print out shadow stack usage in addition to normal stack usage which can be helpful when debugging issues.
The Chrome Security team values having multiple lines of defense. Web browsers are complex, and malicious web pages may try to find and exploit browser bugs to steal data. Additional lines of defense, like sandboxes, make it harder for attackers to access your computer, even if bugs in the browser are exploited. With Site Isolation, Chrome has gained a new line of defense that helps protect your accounts on the Web as well.
Site Isolation ensures that pages from different sites end up in different sandboxed processes in the browser. Chrome can thus limit the entire process to accessing data from only one site, making it harder for an attacker to steal cross-site data. We started isolating all sites for desktop users back in Chrome 67, and now we’re excited to enable it on Android for sites that users log into in Chrome 77. We've also strengthened Site Isolation on desktop to help defend against even fully compromised processes.
Site Isolation helps defend against two types of threats. First, attackers may try to use advanced "side channel" attacks to leak sensitive data from a process through unexpected means. For example, Spectre attacks take advantage of CPU performance features to access data that should be off limits. With Site Isolation, it is harder for the attacker to get cross-site data into their process in the first place.
Second, even more powerful attackers may discover security bugs in the browser, allowing them to completely hijack the sandboxed process. On desktop platforms, Site Isolation can now catch these misbehaving processes and limit their access to cross-site data. We're working to bring this level of hijacked process protection to Android in the future as well.
Thanks to this extra line of defense, Chrome can now help keep your web accounts even more secure. We are still making improvements to get the full benefits of Site Isolation, but this change gives Chrome a solid foundation for protecting your data.
If you’d like to learn more, check out our technical write up on the Chromium blog.
REVOKED
SUSPENDED
KEY_COMPROMISE
CA_COMPROMISE
SUPERSEDED
SOFTWARE_FLAW.
Posted by Adam Bacchus, Sebastian Porst, and Patrick Mutchler — Android Security & Privacy
[Cross-posted from the Android Developers Blog]
We’re constantly looking for ways to further improve the security and privacy of our products, and the ecosystems they support. At Google, we understand the strength of open platforms and ecosystems, and that the best ideas don’t always come from within. It is for this reason that we offer a broad range of vulnerability reward programs, encouraging the community to help us improve security for everyone. Today, we’re expanding on those efforts with some big changes to Google Play Security Reward Program (GPSRP), as well as the launch of the new Developer Data Protection Reward Program (DDPRP).
We are increasing the scope of GPSRP to include all apps in Google Play with 100 million or more installs. These apps are now eligible for rewards, even if the app developers don’t have their own vulnerability disclosure or bug bounty program. In these scenarios, Google helps responsibly disclose identified vulnerabilities to the affected app developer. This opens the door for security researchers to help hundreds of organizations identify and fix vulnerabilities in their apps. If the developers already have their own programs, researchers can collect rewards directly from them on top of the rewards from Google. We encourage app developers to start their own vulnerability disclosure or bug bounty program to work directly with the security researcher community.
Vulnerability data from GPSRP helps Google create automated checks that scan all apps available in Google Play for similar vulnerabilities. Affected app developers are notified through the Play Console as part of the App Security Improvement (ASI) program, which provides information on the vulnerability and how to fix it. Over its lifetime, ASI has helped more than 300,000 developers fix more than 1,000,000 apps on Google Play. In 2018 alone, the program helped over 30,000 developers fix over 75,000 apps. The downstream effect means that those 75,000 vulnerable apps are not distributed to users until the issue is fixed.
To date, GPSRP has paid out over $265,000 in bounties. Recent scope and reward increases have resulted in $75,500 in rewards across July & August alone. With these changes, we anticipate even further engagement from the security research community to bolster the success of the program.
Today, we are also launching the Developer Data Protection Reward Program. DDPRP is a bounty program, in collaboration with HackerOne, meant to identify and mitigate data abuse issues in Android apps, OAuth projects, and Chrome extensions. It recognizes the contributions of individuals who help report apps that are violating Google Play, Google API, or Google Chrome Web Store Extensions program policies.
The program aims to reward anyone who can provide verifiably and unambiguous evidence of data abuse, in a similar model as Google’s other vulnerability reward programs. In particular, the program aims to identify situations where user data is being used or sold unexpectedly, or repurposed in an illegitimate way without user consent. If data abuse is identified related to an app or Chrome extension, that app or extension will accordingly be removed from Google Play or Google Chrome Web Store. In the case of an app developer abusing access to Gmail restricted scopes, their API access will be removed. While no reward table or maximum reward is listed at this time, depending on impact, a single report could net as large as a $50,000 bounty.
As 2019 continues, we look forward to seeing what researchers find next. Thank you to the entire community for contributing to keeping our platforms and ecosystems safe. Happy bug hunting!
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