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Bug#983839: marked as done (linux-image-5.10.0-3-amd64: /proc/kallsyms shouldn't be readable by non-root)

Your message dated Sat, 06 Mar 2021 15:34:39 +0100
with message-id <d30735c2a5530efc14ad29a418e6a52880f8efa5.camel@decadent.org.uk>
and subject line Re: Bug#983839: linux-image-5.10.0-3-amd64: /proc/kallsyms shouldn't be readable by non-root
has caused the Debian Bug report #983839,
regarding linux-image-5.10.0-3-amd64: /proc/kallsyms shouldn't be readable by non-root
to be marked as done.

This means that you claim that the problem has been dealt with.
If this is not the case it is now your responsibility to reopen the
Bug report if necessary, and/or fix the problem forthwith.

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-- 
983839: https://bugs.debian.org/cgi-bin/bugreport.cgi?bug=983839
Debian Bug Tracking System
Contact owner@bugs.debian.org with problems
--- Begin Message --- 
Package: src:linux
Version: 5.10.13-1
Severity: normal

$ wc /proc/kallsyms 
168114 567685 7891149 /proc/kallsyms

https://dustri.org/b/spectre-exploits-in-the-wild.html

The above article says that Fedora no longer makes kallsyms available to
unprivileged users to make attacks on the kernel more difficult.  I think
the Debian kernels should do the same.

-- Package-specific info:
** Version:
Linux version 5.10.0-3-amd64 (debian-kernel@lists.debian.org) (gcc-10 (Debian 10.2.1-6) 10.2.1 20210110, GNU ld (GNU Binutils for Debian) 2.35.1) #1 SMP Debian 5.10.13-1 (2021-02-06)

** Command line:
BOOT_IMAGE=/vmlinuz-5.10.0-3-amd64 root=UUID=6b40496e-ccb0-48fd-8764-167e82fcd779 ro security=selinux nosmt lockdown=confidentiality quiet

** Not tainted

-- System Information:
Debian Release: bullseye/sid
  APT prefers testing
  APT policy: (500, 'testing'), (1, 'experimental')
Architecture: amd64 (x86_64)

Kernel: Linux 5.10.0-3-amd64 (SMP w/2 CPU threads)
Locale: LANG=en_AU.UTF-8, LC_CTYPE=en_AU.UTF-8 (charmap=UTF-8), LANGUAGE=en_AU:en
Shell: /bin/sh linked to /bin/dash
Init: systemd (via /run/systemd/system)
LSM: SELinux: enabled - Mode: Permissive - Policy name: default

Versions of packages linux-image-5.10.0-3-amd64 depends on:
ii  initramfs-tools [linux-initramfs-tool]  0.139
ii  kmod                                    28-1
ii  linux-base                              4.6

Versions of packages linux-image-5.10.0-3-amd64 recommends:
ii  apparmor             2.13.6-9
ii  firmware-linux-free  20200122-1

Versions of packages linux-image-5.10.0-3-amd64 suggests:
pn  debian-kernel-handbook  <none>
ii  grub-pc                 2.04-15
pn  linux-doc-5.10          <none>

Versions of packages linux-image-5.10.0-3-amd64 is related to:
pn  firmware-amd-graphics     <none>
pn  firmware-atheros          <none>
pn  firmware-bnx2             <none>
pn  firmware-bnx2x            <none>
pn  firmware-brcm80211        <none>
pn  firmware-cavium           <none>
pn  firmware-intel-sound      <none>
pn  firmware-intelwimax       <none>
pn  firmware-ipw2x00          <none>
pn  firmware-ivtv             <none>
ii  firmware-iwlwifi          20201218-3
pn  firmware-libertas         <none>
pn  firmware-linux-nonfree    <none>
pn  firmware-misc-nonfree     <none>
pn  firmware-myricom          <none>
pn  firmware-netxen           <none>
pn  firmware-qlogic           <none>
pn  firmware-realtek          <none>
pn  firmware-samsung          <none>
pn  firmware-siano            <none>
pn  firmware-ti-connectivity  <none>
pn  xen-hypervisor            <none>

-- no debconf information

--- End Message ---
--- Begin Message --- 
/proc/kallsyms shows all-zero addresses when opened by an unprivileged
user, so it isn't an information leak.

Ben.

-- 
Ben Hutchings
Knowledge is power.  France is bacon.

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