MGASA-2020-0140

This update is based on upstream 5.5.9 and fixes at least the following security vulnerabilities:

In the Linux kernel 5.4.0-rc2, there is a use-after-free (read) in the _blkaddtrace function in kernel/trace/blktrace.c (which is used to fill out a blkio_trace structure and place it in a per-cpu sub-buffer) (CVE-2019-19768).

There is a use-after-free vulnerability in the Linux kernel through 5.5.2 in the vcdoresize function in drivers/tty/vt/vt.c (CVE-2020-8647).

There is a use-after-free vulnerability in the Linux kernel through 5.5.2 in the nttyreceivebufcommon function in drivers/tty/n_tty.c (CVE-2020-8648).

There is a use-after-free vulnerability in the Linux kernel through 5.5.2 in the vgaconinvertregion function in drivers/video/console/vgacon.c. (CVE-2020-8649).

An issue was discovered in the Linux kernel through 5.5.6. setfdc in drivers/block/floppy.c leads to a waittil_ready out-of-bounds read because the FDC index is not checked for errors before assigning it, aka CID-2e90ca68b0d2 (CVE-2020-9383).

An issue was discovered in the Linux kernel 5.4 and 5.5 through 5.5.6 on the AArch64 architecture. It ignores the top byte in the address passed to the brk system call, potentially moving the memory break downwards when the application expects it to move upwards, aka CID- dcde237319e6. This has been observed to cause heap corruption with the GNU C Library malloc implementation (CVE-2020-9391).

Other notable changes in this update: - kernel is built with the updated gcc-8.4.0, thus fixing the issue with nvidia drivers complaining about gcc mismatch and failing the dkms-nvidia* builds. - ahci: Add Intel Comet Lake H RAID PCI ID - update Amd Sensor Fusion Hub driver to v4 - replace staging exfat driver with new upstream exfat driver - update rtl8812au driver for more hw support (mga#26178) - fscrypt: don't evict dirty inodes after removing key