linux-kernel - Re: [PATCH] ACPI: bus: Match first 9 bytes of device IDs

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <CAHmME9rzS5rAKoAfv7+N_R71pWduV=a=gJJoKPoLtYx7m7CFEg@mail.gmail.com>
Date:   Fri, 25 Feb 2022 19:39:30 +0100
From:   "Jason A. Donenfeld" <Jason@...c4.com>
To:     Ard Biesheuvel <ardb@...nel.org>, Alexander Graf <graf@...zon.com>
Cc:     ACPI Devel Maling List <linux-acpi@...r.kernel.org>,
        Linux Kernel Mailing List <linux-kernel@...r.kernel.org>,
        Len Brown <lenb@...nel.org>,
        "Rafael J. Wysocki" <rafael@...nel.org>,
        Greg KH <gregkh@...uxfoundation.org>,
        "Woodhouse, David" <dwmw@...zon.co.uk>
Subject: Re: [PATCH] ACPI: bus: Match first 9 bytes of device IDs

Okay, the final piece, userspace:

/sys/bus/acpi/devices/QEMUVGID:00/modalias gives:
    acpi:QEMUVGID:VM_GEN_COUNTER:

modinfo -F alias vmgenid.ko gives:
    acpi*:VM_GEN_COUNTER:*

udev src uses fnmatch.

Bash confirms a match:

$ [[ "acpi:QEMUVGID:VM_GEN_COUNTER:" == acpi*:VM_GEN_COUNTER:* ]] &&
echo matches
matches

So I think with ACPI_ID_LEN --> 16 we are good to go.

Jason