Ubuntu: (CVE-2021-47276): linux vulnerability
Description
In the Linux kernel, the following vulnerability has been resolved: ftrace: Do not blindly read the ip address in ftrace_bug() It was reported that a bug on arm64 caused a bad ip address to be used for updating into a nop in ftrace_init(), but the error path (rightfully) returned -EINVAL and not -EFAULT, as the bug caused more than one error to occur. But because -EINVAL was returned, the ftrace_bug() tried to report what was at the location of the ip address, and read it directly. This caused the machine to panic, as the ip was not pointing to a valid memory address. Instead, read the ip address with copy_from_kernel_nofault() to safely access the memory, and if it faults, report that the address faulted, otherwise report what was in that location.
Solution(s)
- ubuntu-upgrade-linux
- ubuntu-upgrade-linux-aws
- ubuntu-upgrade-linux-aws-5-4
- ubuntu-upgrade-linux-aws-hwe
- ubuntu-upgrade-linux-azure
- ubuntu-upgrade-linux-azure-4-15
- ubuntu-upgrade-linux-azure-5-4
- ubuntu-upgrade-linux-bluefield
- ubuntu-upgrade-linux-gcp
- ubuntu-upgrade-linux-gcp-4-15
- ubuntu-upgrade-linux-gcp-5-4
- ubuntu-upgrade-linux-gkeop
- ubuntu-upgrade-linux-hwe
- ubuntu-upgrade-linux-hwe-5-4
- ubuntu-upgrade-linux-kvm
- ubuntu-upgrade-linux-oracle
- ubuntu-upgrade-linux-oracle-5-4
- ubuntu-upgrade-linux-raspi
- ubuntu-upgrade-linux-raspi-5-4
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