Subject: CVE-2024-26703: tracing/timerlat: Move hrtimer_init to timerlat_fd open()

From: Greg Kroah-Hartman <[email-masked]>

Description
===========

In the Linux kernel, the following vulnerability has been resolved:

tracing/timerlat: Move hrtimer_init to timerlat_fd open()

Currently, the timerlat's hrtimer is initialized at the first read of
timerlat_fd, and destroyed at close(). It works, but it causes an error
if the user program open() and close() the file without reading.

Here's an example:

 # echo NO_OSNOISE_WORKLOAD > /sys/kernel/debug/tracing/osnoise/options
 # echo timerlat > /sys/kernel/debug/tracing/current_tracer

 # cat <<EOF > ./timerlat_load.py
 # !/usr/bin/env python3

 timerlat_fd = open("/sys/kernel/tracing/osnoise/per_cpu/cpu0/timerlat_fd", 'r')
 timerlat_fd.close();
 EOF

 # ./taskset -c 0 ./timerlat_load.py
<BOOM>

 BUG: kernel NULL pointer dereference, address: 0000000000000010
 #PF: supervisor read access in kernel mode
 #PF: error_code(0x0000) - not-present page
 PGD 0 P4D 0
 Oops: 0000 [#1] PREEMPT SMP NOPTI
 CPU: 1 PID: 2673 Comm: python3 Not tainted 6.6.13-200.fc39.x86_64 #1
 Hardware name: QEMU Standard PC (Q35 + ICH9, 2009), BIOS 1.16.3-1.fc39 04/01/2014
 RIP: 0010:hrtimer_active+0xd/0x50
 Code: 2e 0f 1f 84 00 00 00 00 00 0f 1f 40 00 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 90 f3 0f 1e fa 0f 1f 44 00 00 48 8b 57 30 <8b> 42 10 a8 01 74 09 f3 90 8b 42 10 a8 01 75 f7 80 7f 38 00 75 1d
 RSP: 0018:ffffb031009b7e10 EFLAGS: 00010286
 RAX: 000000000002db00 RBX: ffff9118f786db08 RCX: 0000000000000000
 RDX: 0000000000000000 RSI: ffff9117a0e64400 RDI: ffff9118f786db08
 RBP: ffff9118f786db80 R08: ffff9117a0ddd420 R09: ffff9117804d4f70
 R10: 0000000000000000 R11: 0000000000000000 R12: ffff9118f786db08
 R13: ffff91178fdd5e20 R14: ffff9117840978c0 R15: 0000000000000000
 FS:  00007f2ffbab1740(0000) GS:ffff9118f7840000(0000) knlGS:0000000000000000
 CS:  0010 DS: 0000 ES: 0000 CR0: 0000000080050033
 CR2: 0000000000000010 CR3: 00000001b402e000 CR4: 0000000000750ee0
 PKRU: 55555554
 Call Trace:
  <TASK>
  ? __die+0x23/0x70
  ? page_fault_oops+0x171/0x4e0
  ? srso_alias_return_thunk+0x5/0x7f
  ? avc_has_extended_perms+0x237/0x520
  ? exc_page_fault+0x7f/0x180
  ? asm_exc_page_fault+0x26/0x30
  ? hrtimer_active+0xd/0x50
  hrtimer_cancel+0x15/0x40
  timerlat_fd_release+0x48/0xe0
  __fput+0xf5/0x290
  __x64_sys_close+0x3d/0x80
  do_syscall_64+0x60/0x90
  ? srso_alias_return_thunk+0x5/0x7f
  ? __x64_sys_ioctl+0x72/0xd0
  ? srso_alias_return_thunk+0x5/0x7f
  ? syscall_exit_to_user_mode+0x2b/0x40
  ? srso_alias_return_thunk+0x5/0x7f
  ? do_syscall_64+0x6c/0x90
  ? srso_alias_return_thunk+0x5/0x7f
  ? exit_to_user_mode_prepare+0x142/0x1f0
  ? srso_alias_return_thunk+0x5/0x7f
  ? syscall_exit_to_user_mode+0x2b/0x40
  ? srso_alias_return_thunk+0x5/0x7f
  ? do_syscall_64+0x6c/0x90
  entry_SYSCALL_64_after_hwframe+0x6e/0xd8
 RIP: 0033:0x7f2ffb321594
 Code: 00 f7 d8 64 89 01 48 83 c8 ff c3 66 2e 0f 1f 84 00 00 00 00 00 90 f3 0f 1e fa 80 3d d5 cd 0d 00 00 74 13 b8 03 00 00 00 0f 05 <48> 3d 00 f0 ff ff 77 3c c3 0f 1f 00 55 48 89 e5 48 83 ec 10 89 7d
 RSP: 002b:00007ffe8d8eef18 EFLAGS: 00000202 ORIG_RAX: 0000000000000003
 RAX: ffffffffffffffda RBX: 00007f2ffba4e668 RCX: 00007f2ffb321594
 RDX: 0000000000000000 RSI: 0000000000000000 RDI: 0000000000000003
 RBP: 00007ffe8d8eef40 R08: 0000000000000000 R09: 0000000000000000
 R10: 55c926e3167eae79 R11: 0000000000000202 R12: 0000000000000003
 R13: 00007ffe8d8ef030 R14: 0000000000000000 R15: 00007f2ffba4e668
  </TASK>
 CR2: 0000000000000010
 ---[ end trace 0000000000000000 ]---

Move hrtimer_init to timerlat_fd open() to avoid this problem.

The Linux kernel CVE team has assigned CVE-2024-26703 to this issue.

Affected and fixed versions
===========================

	Issue introduced in 6.5 with commit e88ed227f639 and fixed in 6.6.18 with commit 5f703935fdb5
	Issue introduced in 6.5 with commit e88ed227f639 and fixed in 6.7.6 with commit 2354d29986eb
	Issue introduced in 6.5 with commit e88ed227f639 and fixed in 6.8 with commit 1389358bb008

Please see https://www.kernel.org for a full list of currently supported
kernel versions by the kernel community.

Unaffected versions might change over time as fixes are backported to
older supported kernel versions.  The official CVE entry at
	https://cve.org/CVERecord/?id=CVE-2024-26703
will be updated if fixes are backported, please check that for the most
up to date information about this issue.

Affected files
==============

The file(s) affected by this issue are:
	kernel/trace/trace_osnoise.c

Mitigation
==========

The Linux kernel CVE team recommends that you update to the latest
stable kernel version for this, and many other bugfixes.  Individual
changes are never tested alone, but rather are part of a larger kernel
release.  Cherry-picking individual commits is not recommended or
supported by the Linux kernel community at all.  If however, updating to
the latest release is impossible, the individual changes to resolve this
issue can be found at these commits:
	https://git.kernel.org/stable/c/5f703935fdb559642d85b2088442ee55a557ae6d
	https://git.kernel.org/stable/c/2354d29986ebd138f89c2b73fecf8237e0a4ad6b
	https://git.kernel.org/stable/c/1389358bb008e7625942846e9f03554319b7fecc