diff options
| author | Dmitry Vyukov <dvyukov@google.com> | 2022-04-25 08:07:36 +0200 |
|---|---|---|
| committer | Dmitry Vyukov <dvyukov@google.com> | 2022-04-25 11:27:42 +0200 |
| commit | 0ede5bfc57b8910f6436a23955422fae109636c2 (patch) | |
| tree | b733de305f3c59d2b5835d815a0ccbbbe6b3fef6 /sys/linux/dev_msr.txt | |
| parent | f3819cab601e2cd12383bf4e307988c3e3732dd4 (diff) | |
dashboard/config/linux: disable MSR writes
Randomly changing MSRs can have unpredictable results.
We tried to protect from writes on descriptions level,
but it does not work well, the fuzzer has figured out:
03:37:28 executing program 3:
syz_open_dev$MSR(&(0x7f0000000040), 0x0, 0x0)
r0 = syz_open_procfs(0x0, &(0x7f0000000180)='fd/3\x00')
pwritev(r0, ...)
Fortunately there is a command line argument that disables all writes.
Use it instead.
Note: older kernels will need:
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=a7e1f67ed29f
https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=02a16aa13574
Diffstat (limited to 'sys/linux/dev_msr.txt')
| -rw-r--r-- | sys/linux/dev_msr.txt | 2 |
1 files changed, 0 insertions, 2 deletions
diff --git a/sys/linux/dev_msr.txt b/sys/linux/dev_msr.txt index 07a3d3554..f3ae87664 100644 --- a/sys/linux/dev_msr.txt +++ b/sys/linux/dev_msr.txt @@ -11,5 +11,3 @@ syz_open_dev$MSR(dev ptr[in, string["/dev/cpu/#/msr"]], id intptr, flags const[O read$msr(fd fd_msr, buf buffer[out], count len[buf]) ioctl$X86_IOC_RDMSR_REGS(fd fd_msr, cmd const[X86_IOC_RDMSR_REGS], arg ptr[in, array[int32, 8]]) -# Disallow writing to MSRs -_ = X86_IOC_WRMSR_REGS |