[FS#3741] Bus error on musl tzset

[OpenWrt Bugs]

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A new Flyspray task has been opened.  Details are below. 

User who did this - selvamuthukumar (selvamuthukumar) 

Attached to Project - OpenWrt/LEDE Project
Summary - Bus error on musl tzset 
Task Type - Bug Report
Category - Toolchain
Status - Unconfirmed
Assigned To - 
Operating System - All
Severity - Low
Priority - Very Low
Reported Version - Trunk
Due in Version - Undecided
Due Date - Undecided
Details - toolchain/musl/patches/110-read_timezone_from_fs.patch - Adds support for reading timezone from /etc/TZ.
It does mmap of the file. There is a possible race condition here. If /etc/TZ is truncated between mmap and read, read can cause bus error (SIGBUS).

More information can be found at the following URL:
https://bugs.openwrt.org/index.php?do=details&task_id=3741

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