Bug#842226: dmesg: read kernel buffer failed: Operation not permitted

[Vincent Blut]

On Thu, Oct 27, 2016 at 03:21:14PM +0900, Kyuma Ohta wrote:

Package: src:linux
Version: 4.8.4-1~exp1
Severity: normal

Dear Maintainer,

Using dmesg as non-root user at linux-4.8-trunk, failed to read
kernels' ring buffer as below:
$ dmesg
dmesg: read kernel buffer failed: Operation not permitted

As root user to read, succeeeded.
Is change security policy? If not, please fix.

Hello,

Part of the changelog from the aforementioned kernel:

* security,printk: Enable SECURITY_DMESG_RESTRICT, preventing non-root users reading the kernel log by default (sysctl: kernel.dmesg_restrict)

Regards,
Ohta.

Cheers,
Vincent

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