Upstream information
Description
In the Linux kernel, the following vulnerability has been resolved:riscv: process: Fix kernel gp leakage
childregs represents the registers which are active for the new thread
in user context. For a kernel thread, childregs->gp is never used since
the kernel gp is not touched by switch_to. For a user mode helper, the
gp value can be observed in user space after execve or possibly by other
means.
[From the email thread]
The /* Kernel thread */ comment is somewhat inaccurate in that it is also used
for user_mode_helper threads, which exec a user process, e.g. /sbin/init or
when /proc/sys/kernel/core_pattern is a pipe. Such threads do not have
PF_KTHREAD set and are valid targets for ptrace etc. even before they exec.
childregs is the *user* context during syscall execution and it is observable
from userspace in at least five ways:
1. kernel_execve does not currently clear integer registers, so the starting
register state for PID 1 and other user processes started by the kernel has
sp = user stack, gp = kernel __global_pointer$, all other integer registers
zeroed by the memset in the patch comment.
This is a bug in its own right, but I'm unwilling to bet that it is the only
way to exploit the issue addressed by this patch.
2. ptrace(PTRACE_GETREGSET): you can PTRACE_ATTACH to a user_mode_helper thread
before it execs, but ptrace requires SIGSTOP to be delivered which can only
happen at user/kernel boundaries.
3. /proc/*/task/*/syscall: this is perfectly happy to read pt_regs for
user_mode_helpers before the exec completes, but gp is not one of the
registers it returns.
4. PERF_SAMPLE_REGS_USER: LOCKDOWN_PERF normally prevents access to kernel
addresses via PERF_SAMPLE_REGS_INTR, but due to this bug kernel addresses
are also exposed via PERF_SAMPLE_REGS_USER which is permitted under
LOCKDOWN_PERF. I have not attempted to write exploit code.
5. Much of the tracing infrastructure allows access to user registers. I have
not attempted to determine which forms of tracing allow access to user
registers without already allowing access to kernel registers.
SUSE information
Overall state of this security issue: Resolved
This issue is currently rated as having moderate severity.
| SUSE | |
|---|---|
| Base Score | 5.5 |
| Vector | CVSS:3.1/AV:L/AC:L/PR:L/UI:N/S:U/C:N/I:N/A:H |
| Attack Vector | Local |
| Attack Complexity | Low |
| Privileges Required | Low |
| User Interaction | None |
| Scope | Unchanged |
| Confidentiality Impact | None |
| Integrity Impact | None |
| Availability Impact | High |
| CVSSv3 Version | 3.1 |
Status of this issue by product and package
Please note that this evaluation state might be work in progress, incomplete or outdated. Also information for service packs in the LTSS phase is only included for issues meeting the LTSS criteria. If in doubt, feel free to contact us for clarification. The updates are grouped by state of their lifecycle. SUSE product lifecycles are documented on the lifecycle page.
| Product(s) | Source package | State |
|---|---|---|
| Products under general support and receiving all security fixes. | ||
| SUSE Linux Enterprise Desktop 15 SP5 | kernel-default | Ignore |
| SUSE Linux Enterprise Desktop 15 SP5 | kernel-source | Ignore |
| SUSE Linux Enterprise Desktop 15 SP6 | kernel-default | Ignore |
| SUSE Linux Enterprise Desktop 15 SP6 | kernel-source | Ignore |
| SUSE Linux Enterprise High Performance Computing 12 SP5 | kernel-default | Ignore |
| SUSE Linux Enterprise High Performance Computing 12 SP5 | kernel-source | Ignore |
| SUSE Linux Enterprise High Performance Computing 12 SP5 | kernel-source-azure | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | kernel-default | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | kernel-source | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP5 | kernel-source-azure | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | kernel-default | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | kernel-source | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP6 | kernel-source-azure | Ignore |
| SUSE Linux Enterprise Micro 5.1 | kernel-default | Ignore |
| SUSE Linux Enterprise Micro 5.1 | kernel-rt | Ignore |
| SUSE Linux Enterprise Micro 5.1 | kernel-source-rt | Ignore |
| SUSE Linux Enterprise Micro 5.2 | kernel-default | Ignore |
| SUSE Linux Enterprise Micro 5.2 | kernel-rt | Ignore |
| SUSE Linux Enterprise Micro 5.2 | kernel-source-rt | Ignore |
| SUSE Linux Enterprise Micro 5.3 | kernel-default | Ignore |
| SUSE Linux Enterprise Micro 5.3 | kernel-rt | Ignore |
| SUSE Linux Enterprise Micro 5.3 | kernel-source-rt | Ignore |
| SUSE Linux Enterprise Micro 5.4 | kernel-default | Ignore |
| SUSE Linux Enterprise Micro 5.4 | kernel-rt | Ignore |
| SUSE Linux Enterprise Micro 5.4 | kernel-source-rt | Ignore |
| SUSE Linux Enterprise Micro 5.5 | kernel-source-rt | Ignore |
| SUSE Linux Enterprise Micro 6.0 | kernel-source | Ignore |
| SUSE Linux Enterprise Micro 6.0 | kernel-source-rt | Ignore |
| SUSE Linux Enterprise Module for Basesystem 15 SP5 | kernel-default | Ignore |
| SUSE Linux Enterprise Module for Basesystem 15 SP5 | kernel-source | Ignore |
| SUSE Linux Enterprise Module for Basesystem 15 SP6 | kernel-default | Ignore |
| SUSE Linux Enterprise Module for Basesystem 15 SP6 | kernel-source | Ignore |
| SUSE Linux Enterprise Module for Development Tools 15 SP5 | kernel-default | Ignore |
| SUSE Linux Enterprise Module for Development Tools 15 SP5 | kernel-source | Ignore |
| SUSE Linux Enterprise Module for Development Tools 15 SP6 | kernel-default | Ignore |
| SUSE Linux Enterprise Module for Development Tools 15 SP6 | kernel-source | Ignore |
| SUSE Linux Enterprise Module for Public Cloud 15 SP5 | kernel-source-azure | Ignore |
| SUSE Linux Enterprise Module for Public Cloud 15 SP6 | kernel-source-azure | Ignore |
| SUSE Linux Enterprise Real Time 12 SP5 | kernel-source-rt | Ignore |
| SUSE Linux Enterprise Real Time 15 SP5 | kernel-source-rt | Ignore |
| SUSE Linux Enterprise Real Time 15 SP6 | kernel-source-rt | Ignore |
| SUSE Linux Enterprise Server 12 SP5 | kernel-default | Ignore |
| SUSE Linux Enterprise Server 12 SP5 | kernel-source | Ignore |
| SUSE Linux Enterprise Server 12 SP5 | kernel-source-azure | Ignore |
| SUSE Linux Enterprise Server 12 SP5-LTSS | kernel-source | Ignore |
| SUSE Linux Enterprise Server 12 SP5-LTSS | kernel-source-azure | Ignore |
| SUSE Linux Enterprise Server 15 SP5 | kernel-default | Ignore |
| SUSE Linux Enterprise Server 15 SP5 | kernel-source | Ignore |
| SUSE Linux Enterprise Server 15 SP5 | kernel-source-azure | Ignore |
| SUSE Linux Enterprise Server 15 SP6 | kernel-default | Ignore |
| SUSE Linux Enterprise Server 15 SP6 | kernel-source | Ignore |
| SUSE Linux Enterprise Server 15 SP6 | kernel-source-azure | Ignore |
| SUSE Linux Enterprise Server for SAP Applications 12 SP5 | kernel-default | Ignore |
| SUSE Linux Enterprise Server for SAP Applications 12 SP5 | kernel-source | Ignore |
| SUSE Linux Enterprise Server for SAP Applications 12 SP5 | kernel-source-azure | Ignore |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | kernel-default | Ignore |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | kernel-source | Ignore |
| SUSE Linux Enterprise Server for SAP Applications 15 SP5 | kernel-source-azure | Ignore |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | kernel-default | Ignore |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | kernel-source | Ignore |
| SUSE Linux Enterprise Server for SAP Applications 15 SP6 | kernel-source-azure | Ignore |
| SUSE Manager Proxy 4.3 | kernel-default | Ignore |
| SUSE Manager Proxy 4.3 | kernel-source | Ignore |
| SUSE Manager Retail Branch Server 4.3 | kernel-default | Ignore |
| SUSE Manager Retail Branch Server 4.3 | kernel-source | Ignore |
| SUSE Manager Server 4.3 | kernel-default | Ignore |
| SUSE Manager Server 4.3 | kernel-source | Ignore |
| SUSE Real Time Module 15 SP5 | kernel-source-rt | Ignore |
| SUSE Real Time Module 15 SP6 | kernel-source-rt | Ignore |
| openSUSE Leap 15.5 | kernel-default | Ignore |
| openSUSE Leap 15.5 | kernel-source | Ignore |
| openSUSE Leap 15.5 | kernel-source-azure | Ignore |
| openSUSE Leap 15.5 | kernel-source-rt | Ignore |
| openSUSE Leap 15.6 | kernel-default | Ignore |
| openSUSE Leap 15.6 | kernel-source | Ignore |
| openSUSE Leap 15.6 | kernel-source-azure | Ignore |
| openSUSE Leap 15.6 | kernel-source-rt | Ignore |
| Products under Long Term Service Pack support and receiving important and critical security fixes. | ||
| SUSE Linux Enterprise Desktop 15 SP4 | kernel-source | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP2 | kernel-source | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP2-ESPOS | kernel-source | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS | kernel-default | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP2-LTSS | kernel-source | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP3 | kernel-source | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP3-ESPOS | kernel-source | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS | kernel-default | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP3-LTSS | kernel-source | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP4 | kernel-source | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-default | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP4-ESPOS | kernel-source | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | kernel-default | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP4-LTSS | kernel-source | Ignore |
| SUSE Linux Enterprise Module for Basesystem 15 SP2 | kernel-source | Ignore |
| SUSE Linux Enterprise Module for Basesystem 15 SP3 | kernel-source | Ignore |
| SUSE Linux Enterprise Module for Basesystem 15 SP4 | kernel-source | Ignore |
| SUSE Linux Enterprise Module for Development Tools 15 SP2 | kernel-source | Ignore |
| SUSE Linux Enterprise Module for Development Tools 15 SP3 | kernel-source | Ignore |
| SUSE Linux Enterprise Module for Development Tools 15 SP4 | kernel-source | Ignore |
| SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE | kernel-default | Ignore |
| SUSE Linux Enterprise Server 11 SP4 LTSS EXTREME CORE | kernel-source | Ignore |
| SUSE Linux Enterprise Server 15 SP2 | kernel-source | Ignore |
| SUSE Linux Enterprise Server 15 SP2-LTSS | kernel-default | Ignore |
| SUSE Linux Enterprise Server 15 SP2-LTSS | kernel-source | Ignore |
| SUSE Linux Enterprise Server 15 SP3 | kernel-source | Ignore |
| SUSE Linux Enterprise Server 15 SP3-LTSS | kernel-default | Ignore |
| SUSE Linux Enterprise Server 15 SP3-LTSS | kernel-source | Ignore |
| SUSE Linux Enterprise Server 15 SP4 | kernel-source | Ignore |
| SUSE Linux Enterprise Server 15 SP4-LTSS | kernel-default | Ignore |
| SUSE Linux Enterprise Server 15 SP4-LTSS | kernel-source | Ignore |
| SUSE Linux Enterprise Server for SAP Applications 15 SP2 | kernel-default | Ignore |
| SUSE Linux Enterprise Server for SAP Applications 15 SP2 | kernel-source | Ignore |
| SUSE Linux Enterprise Server for SAP Applications 15 SP3 | kernel-default | Ignore |
| SUSE Linux Enterprise Server for SAP Applications 15 SP3 | kernel-source | Ignore |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | kernel-default | Ignore |
| SUSE Linux Enterprise Server for SAP Applications 15 SP4 | kernel-source | Ignore |
| Products past their end of life and not receiving proactive updates anymore. | ||
| HPE Helion OpenStack 8 | kernel-source | Ignore |
| SUSE CaaS Platform 4.0 | kernel-source | Ignore |
| SUSE CaaS Platform Toolchain 3 | kernel-source | Ignore |
| SUSE Enterprise Storage 6 | kernel-source | Ignore |
| SUSE Enterprise Storage 7 | kernel-source | Ignore |
| SUSE Enterprise Storage 7.1 | kernel-default | Ignore |
| SUSE Enterprise Storage 7.1 | kernel-source | Ignore |
| SUSE Linux Enterprise Desktop 11 SP4 | kernel-source | Ignore |
| SUSE Linux Enterprise Desktop 12 SP3 | kernel-source | Ignore |
| SUSE Linux Enterprise Desktop 12 SP4 | kernel-source | Ignore |
| SUSE Linux Enterprise Desktop 15 | kernel-source | Ignore |
| SUSE Linux Enterprise Desktop 15 SP1 | kernel-source | Ignore |
| SUSE Linux Enterprise Desktop 15 SP2 | kernel-source | Ignore |
| SUSE Linux Enterprise Desktop 15 SP3 | kernel-source | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 | kernel-source | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP1 | kernel-source | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP1-ESPOS | kernel-source | Ignore |
| SUSE Linux Enterprise High Performance Computing 15 SP1-LTSS | kernel-source | Ignore |
| SUSE Linux Enterprise High Performance Computing 15-ESPOS | kernel-source | Ignore |
| SUSE Linux Enterprise High Performance Computing 15-LTSS | kernel-source | Ignore |
| SUSE Linux Enterprise Micro 5.0 | kernel-default | Ignore |
| SUSE Linux Enterprise Module for Basesystem 15 | kernel-source | Ignore |
| SUSE Linux Enterprise Module for Basesystem 15 SP1 | kernel-source | Ignore |
| SUSE Linux Enterprise Module for Development Tools 15 | kernel-source | Ignore |
| SUSE Linux Enterprise Module for Development Tools 15 SP1 | kernel-source | Ignore |
| SUSE Linux Enterprise Real Time 15 SP2 | kernel-source | Ignore |
| SUSE Linux Enterprise Real Time 15 SP3 | kernel-source | Ignore |
| SUSE Linux Enterprise Real Time 15 SP3 | kernel-source-rt | Ignore |
| SUSE Linux Enterprise Real Time 15 SP4 | kernel-source | Ignore |
| SUSE Linux Enterprise Real Time 15 SP4 | kernel-source-rt | Ignore |
| SUSE Linux Enterprise Server 11 SP4 | kernel-source | Ignore |
| SUSE Linux Enterprise Server 11 SP4 LTSS | kernel-default | Ignore |
| SUSE Linux Enterprise Server 11 SP4 LTSS | kernel-source | Ignore |
| SUSE Linux Enterprise Server 11 SP4-LTSS | kernel-source | Ignore |
| SUSE Linux Enterprise Server 12 SP3 | kernel-source | Ignore |
| SUSE Linux Enterprise Server 12 SP3-BCL | kernel-source | Ignore |
| SUSE Linux Enterprise Server 12 SP3-ESPOS | kernel-source | Ignore |
| SUSE Linux Enterprise Server 12 SP3-LTSS | kernel-source | Ignore |
| SUSE Linux Enterprise Server 12 SP4 | kernel-source | Ignore |
| SUSE Linux Enterprise Server 12 SP4-ESPOS | kernel-source | Ignore |
| SUSE Linux Enterprise Server 12 SP4-LTSS | kernel-default | Ignore |
| SUSE Linux Enterprise Server 12 SP4-LTSS | kernel-source | Ignore |
| SUSE Linux Enterprise Server 15 | kernel-source | Ignore |
| SUSE Linux Enterprise Server 15 SP1 | kernel-source | Ignore |
| SUSE Linux Enterprise Server 15 SP1-BCL | kernel-source | Ignore |
| SUSE Linux Enterprise Server 15 SP1-LTSS | kernel-default | Ignore |
| SUSE Linux Enterprise Server 15 SP1-LTSS | kernel-source | Ignore |
| SUSE Linux Enterprise Server 15 SP2-BCL | kernel-source | Ignore |
| SUSE Linux Enterprise Server 15 SP3-BCL | kernel-source | Ignore |
| SUSE Linux Enterprise Server 15-LTSS | kernel-default | Ignore |
| SUSE Linux Enterprise Server 15-LTSS | kernel-source | Ignore |
| SUSE Linux Enterprise Server for SAP Applications 12 SP3 | kernel-source | Ignore |
| SUSE Linux Enterprise Server for SAP Applications 12 SP4 | kernel-default | Ignore |
| SUSE Linux Enterprise Server for SAP Applications 12 SP4 | kernel-source | Ignore |
| SUSE Linux Enterprise Server for SAP Applications 15 | kernel-source | Ignore |
| SUSE Linux Enterprise Server for SAP Applications 15 SP1 | kernel-source | Ignore |
| SUSE Manager Proxy 4.0 | kernel-source | Ignore |
| SUSE Manager Proxy 4.1 | kernel-source | Ignore |
| SUSE Manager Proxy 4.2 | kernel-source | Ignore |
| SUSE Manager Retail Branch Server 4.0 | kernel-source | Ignore |
| SUSE Manager Retail Branch Server 4.1 | kernel-source | Ignore |
| SUSE Manager Retail Branch Server 4.2 | kernel-source | Ignore |
| SUSE Manager Server 4.0 | kernel-source | Ignore |
| SUSE Manager Server 4.1 | kernel-source | Ignore |
| SUSE Manager Server 4.2 | kernel-source | Ignore |
| SUSE OpenStack Cloud 8 | kernel-source | Ignore |
| SUSE OpenStack Cloud 9 | kernel-default | Ignore |
| SUSE OpenStack Cloud 9 | kernel-source | Ignore |
| SUSE OpenStack Cloud Crowbar 8 | kernel-source | Ignore |
| SUSE OpenStack Cloud Crowbar 9 | kernel-default | Ignore |
| SUSE OpenStack Cloud Crowbar 9 | kernel-source | Ignore |
| SUSE Real Time Module 15 SP3 | kernel-source-rt | Ignore |
| SUSE Real Time Module 15 SP4 | kernel-source-rt | Ignore |
| openSUSE Leap 15.3 | kernel-source | Ignore |
| openSUSE Leap 15.3 | kernel-source-rt | Ignore |
| openSUSE Leap 15.4 | kernel-source | Ignore |
| openSUSE Leap 15.4 | kernel-source-azure | Ignore |
| openSUSE Leap 15.4 | kernel-source-rt | Ignore |
| Products at an unknown state of their lifecycle. | ||
| SUSE Linux Enterprise Server 12 SP5-LTSS-EXTENDED-SECURITY | kernel-source | Ignore |
| SUSE Linux Enterprise Server 12 SP5-LTSS-EXTENDED-SECURITY | kernel-source-azure | Ignore |
SUSE Timeline for this CVE
CVE page created: Sun May 19 12:00:08 2024CVE page last modified: Sat Oct 5 00:21:49 2024