musl: x87 floating-point stack adjustment imbalance — GLSA 202003-13

An x87 stack handling error in musl might allow an attacker to have an application dependent impact.

Affected packages

Package	sys-libs/musl on all architectures
Affected versions	< 1.1.24
Unaffected versions	>= 1.1.24

Background

musl is an implementation of the C standard library built on top of the Linux system call API, including interfaces defined in the base language standard, POSIX, and widely agreed-upon extensions.

Description

A flaw in musl libc’s arch-specific math assembly code for i386 was found which can lead to x87 stack overflow in the execution of subsequent math code.

Impact

Impact depends on how the application built against musl libc handles the ABI-violating x87 state.

Workaround

There is no known workaround at this time.

Resolution

All musl users should upgrade to the latest version:

 # emerge --sync
 # emerge --ask --oneshot --verbose ">=sys-libs/musl-1.1.24"

References

CVE-2019-14697

Release date
March 14, 2020

Latest revision
March 15, 2020: 2

Severity
normal

Exploitable
local, remote

Bugzilla entries

711276