This bug is awaiting verification that the kernel in -proposed solves the problem. Please test the kernel and update this bug with the results. If the problem is solved, change the tag 'verification-needed- xenial' to 'verification-done-xenial'. If the problem still exists, change the tag 'verification-needed-xenial' to 'verification-failed- xenial'.
If verification is not done by 5 working days from today, this fix will be dropped from the source code, and this bug will be closed. See https://wiki.ubuntu.com/Testing/EnableProposed for documentation how to enable and use -proposed. Thank you! ** Tags added: verification-needed-xenial -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux in Ubuntu. https://bugs.launchpad.net/bugs/1847189 Title: Bad posix clock speculation mitigation backport Status in linux package in Ubuntu: Invalid Status in linux source package in Xenial: Fix Committed Bug description: [Impact] Vitaly Nikolenko pointed out that syscall(__NR_clock_gettime, 10, 0) can be used to perform a denial of service (system crash) or possibly execute arbitrary code in the Ubuntu Xenial kernel: https://twitter.com/vnik5287/status/1180666151216435200 [Test Case] Execute the following test program and verify that it prints out "clock_gettime: Invalid argument" rather than triggering a NULL pointer dereference and stack trace in the kernel logs. ========== #include <stdio.h> #include <time.h> int main(void) { int rc = clock_gettime(10, 0); if (rc < 0) perror("clock_gettime"); return rc; } ========== [Regression Potential] Low. The fix is easy to review and fixes a denial of service issue that's trivial to trigger. To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1847189/+subscriptions -- Mailing list: https://launchpad.net/~kernel-packages Post to : kernel-packages@lists.launchpad.net Unsubscribe : https://launchpad.net/~kernel-packages More help : https://help.launchpad.net/ListHelp
