Can you please provide full system details and the steps to reproduce.
** Summary changed: - Fix-compat_sys_recvmsg-on-x32-archs + Fix-compat_sys_recvmmsg-on-x32-archs -- You received this bug notification because you are a member of Kernel Packages, which is subscribed to linux-armadaxp in Ubuntu. https://bugs.launchpad.net/bugs/1274349 Title: Fix-compat_sys_recvmmsg-on-x32-archs Status in “linux” package in Ubuntu: Confirmed Status in “linux-armadaxp” package in Ubuntu: Invalid Status in “linux-ec2” package in Ubuntu: Invalid Status in “linux-fsl-imx51” package in Ubuntu: Invalid Status in “linux-lts-quantal” package in Ubuntu: Invalid Status in “linux-lts-raring” package in Ubuntu: Invalid Status in “linux-lts-saucy” package in Ubuntu: Invalid Status in “linux-mvl-dove” package in Ubuntu: Invalid Status in “linux-ti-omap4” package in Ubuntu: Invalid Status in “linux” source package in Lucid: Invalid Status in “linux-armadaxp” source package in Lucid: Invalid Status in “linux-ec2” source package in Lucid: Invalid Status in “linux-fsl-imx51” source package in Lucid: Invalid Status in “linux-lts-quantal” source package in Lucid: Invalid Status in “linux-lts-raring” source package in Lucid: Invalid Status in “linux-lts-saucy” source package in Lucid: Invalid Status in “linux-mvl-dove” source package in Lucid: Invalid Status in “linux-ti-omap4” source package in Lucid: Invalid Status in “linux” source package in Precise: Invalid Status in “linux-armadaxp” source package in Precise: Invalid Status in “linux-ec2” source package in Precise: Invalid Status in “linux-fsl-imx51” source package in Precise: Invalid Status in “linux-lts-quantal” source package in Precise: Invalid Status in “linux-lts-raring” source package in Precise: Fix Released Status in “linux-lts-saucy” source package in Precise: Fix Released Status in “linux-mvl-dove” source package in Precise: Invalid Status in “linux-ti-omap4” source package in Precise: Invalid Status in “linux” source package in Quantal: Invalid Status in “linux-armadaxp” source package in Quantal: Invalid Status in “linux-ec2” source package in Quantal: Invalid Status in “linux-fsl-imx51” source package in Quantal: Invalid Status in “linux-lts-quantal” source package in Quantal: Invalid Status in “linux-lts-raring” source package in Quantal: Invalid Status in “linux-lts-saucy” source package in Quantal: Invalid Status in “linux-mvl-dove” source package in Quantal: Invalid Status in “linux-ti-omap4” source package in Quantal: Invalid Status in “linux” source package in Saucy: Fix Released Status in “linux-armadaxp” source package in Saucy: Invalid Status in “linux-ec2” source package in Saucy: Invalid Status in “linux-fsl-imx51” source package in Saucy: Invalid Status in “linux-lts-quantal” source package in Saucy: Invalid Status in “linux-lts-raring” source package in Saucy: Invalid Status in “linux-lts-saucy” source package in Saucy: Invalid Status in “linux-mvl-dove” source package in Saucy: Invalid Status in “linux-ti-omap4” source package in Saucy: Invalid Status in “linux” source package in Trusty: Confirmed Status in “linux-armadaxp” source package in Trusty: Invalid Status in “linux-ec2” source package in Trusty: Invalid Status in “linux-fsl-imx51” source package in Trusty: Invalid Status in “linux-lts-quantal” source package in Trusty: Invalid Status in “linux-lts-raring” source package in Trusty: Invalid Status in “linux-lts-saucy” source package in Trusty: Invalid Status in “linux-mvl-dove” source package in Trusty: Invalid Status in “linux-ti-omap4” source package in Trusty: Invalid Bug description: The timeout pointer parameter is provided by userland (hence the __user annotation) but for x32 syscalls it's simply cast to a kernel pointer and is passed to __sys_recvmmsg which will eventually directly dereference it for both reading and writing. Other callers to __sys_recvmmsg properly copy from userland to the kernel first. The impact is a sort of arbitrary kernel write-where-what primitive by unprivileged users where the to-be-written area must contain valid timespec data initially (the first 64 bit long field must be positive and the second one must be < 1G). Break-Fix: ee4fa23c4bfcc635d077a9633d405610de45bc70 2def2ef2ae5f3990aabdbe8a755911902707d268 To manage notifications about this bug go to: https://bugs.launchpad.net/ubuntu/+source/linux/+bug/1274349/+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