By the way, on 4.19, this is now only readable by root. So, now returns
EACCESS when user tries to read it.
$ cat /proc/self/stack
cat: /proc/self/stack: Permission denied
f8a00cef17206ecd1b30d3d9f99e10d9fa707aa7 proc: restrict kernel stack
dumps to root
** Also affects: linux (Ubuntu)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Disco)
Importance: Undecided
Status: New
** Also affects: linux-kvm (Ubuntu Disco)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: linux-kvm (Ubuntu Bionic)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Xenial)
Importance: Undecided
Status: New
** Also affects: linux-kvm (Ubuntu Xenial)
Importance: Undecided
Status: New
** Also affects: linux (Ubuntu Cosmic)
Importance: Undecided
Status: New
** Also affects: linux-kvm (Ubuntu Cosmic)
Importance: Undecided
Status: New
** Changed in: linux (Ubuntu Xenial)
Status: New => Invalid
** Changed in: linux (Ubuntu Bionic)
Status: New => Invalid
--
You received this bug notification because you are a member of Kernel
Packages, which is subscribed to linux-kvm in Ubuntu.
https://bugs.launchpad.net/bugs/1805105
Title:
/proc/self/stack does not exist in kvm kernel, causing failures in
kernel security test
Status in QA Regression Testing:
Fix Released
Status in ubuntu-kernel-tests:
New
Status in linux package in Ubuntu:
Incomplete
Status in linux-kvm package in Ubuntu:
New
Status in linux source package in Xenial:
Invalid
Status in linux-kvm source package in Xenial:
New
Status in linux source package in Bionic:
Invalid
Status in linux-kvm source package in Bionic:
New
Status in linux source package in Cosmic:
Incomplete
Status in linux-kvm source package in Cosmic:
New
Status in linux source package in Disco:
Incomplete
Status in linux-kvm source package in Disco:
New
Bug description:
Linux larry 4.18.0-1005-kvm #5-Ubuntu SMP Thu Nov 15 20:22:03 UTC 2018
x86_64 x86_64 x86_64 GNU/Linux
# ls /proc/self/stack
ls: cannot access '/proc/self/stack': No such file or directory
Thus:
FAIL: test_095_kernel_symbols_missing_proc_self_stack
(__main__.KernelSecurityTest)
kernel addresses in /proc/self/stack are zeroed out
----------------------------------------------------------------------
Traceback (most recent call last):
File "./test-kernel-security.py", line 1352, in
test_095_kernel_symbols_missing_proc_self_stack
self._check_pK_files(self._095_kernel_symbols_missing_proc_self_stack,
expected=expected)
File "./test-kernel-security.py", line 1199, in _check_pK_files
test_function(expected_restricted)
File "./test-kernel-security.py", line 1296, in
_095_kernel_symbols_missing_proc_self_stack
'/proc/self/stack does not exist')
AssertionError: /proc/self/stack does not exist
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