CVE-2021-47276: ftrace: Do not blindly read the ip address in ftrace_bug()

First published: Tue May 21 2024(Updated: )

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.

Credit: 416baaa9-dc9f-4396-8d5f-8c081fb06d67

Never miss a vulnerability like this again

Sign up to SecAlerts for real-time vulnerability data matched to your software, aggregated from hundreds of sources.

Read MoreStart Free Trial

• agent/title
• agent/references
• agent/description
• agent/type
• agent/first-publish-date
• agent/author
• agent/event
• collector/mitre-cve
• source/MITRE
• agent/source
• agent/guess-ai
• agent/software-canonical-lookup
• agent/software-canonical-lookup-request
• collector/nvd-api
• source/NVD
• agent/last-modified-date
• agent/remedy
• agent/weakness
• agent/severity
• agent/softwarecombine
• agent/tags
• vendor/linux
• canonical/red hat kernel-devel
• canonical/linux kernel
• version/linux kernel/2.6.28
• version/linux kernel/4.5
• version/linux kernel/4.10
• version/linux kernel/4.15
• version/linux kernel/4.20
• version/linux kernel/5.5
• version/linux kernel/5.11
• version/linux kernel/5.13-rc1
• version/linux kernel/5.13-rc2
• version/linux kernel/5.13-rc3
• version/linux kernel/5.13-rc4
• version/linux kernel/5.13-rc5