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3fa0af4cc8
Avoid unshifted ouids for socket file operations as observed when using
AppArmor profiles in unprivileged containers with LXD or Incus.
For example, root inside container and uid 1000000 outside, with
`owner /root/sock rw,` profile entry for nc:
/root$ nc -lkU sock & nc -U sock
==> dmesg
apparmor="DENIED" operation="connect" class="file"
namespace="root//lxd-podia_<var-snap-lxd-common-lxd>" profile="sockit"
name="/root/sock" pid=3924 comm="nc" requested_mask="wr" denied_mask="wr"
fsuid=1000000 ouid=0 [<== should be 1000000]
Fix by performing uid mapping as per common_perm_cond() in lsm.c
Signed-off-by: Gabriel Totev <gabriel.totev@zetier.com>
Fixes: c05e705812 ("apparmor: add fine grained af_unix mediation")
Signed-off-by: John Johansen <john.johansen@canonical.com>
Linux kernel
============
There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.
In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``. The formatted documentation can also be read online at:
https://www.kernel.org/doc/html/latest/
There are various text files in the Documentation/ subdirectory,
several of them using the reStructuredText markup notation.
Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.