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Subject[PATCH 5.11 069/775] x86/MSR: Filter MSR writes through X86_IOC_WRMSR_REGS ioctl too
Date
From: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>

[ Upstream commit 02a16aa13574c8526beadfc9ae8cc9b66315fa2d ]

Commit

a7e1f67ed29f ("x86/msr: Filter MSR writes")

introduced a module parameter to disable writing to the MSR device file
and tainted the kernel upon writing. As MSR registers can be written by
the X86_IOC_WRMSR_REGS ioctl too, the same filtering and tainting should
be applied to the ioctl as well.

[ bp: Massage commit message and space out statements. ]

Fixes: a7e1f67ed29f ("x86/msr: Filter MSR writes")
Signed-off-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/20210127122456.13939-1-misono.tomohiro@jp.fujitsu.com
Signed-off-by: Sasha Levin <sashal@kernel.org>
---
arch/x86/kernel/msr.c | 7 +++++++
1 file changed, 7 insertions(+)

diff --git a/arch/x86/kernel/msr.c b/arch/x86/kernel/msr.c
index 8a67d1fa8dc58..ed8ac6bcbafb2 100644
--- a/arch/x86/kernel/msr.c
+++ b/arch/x86/kernel/msr.c
@@ -182,6 +182,13 @@ static long msr_ioctl(struct file *file, unsigned int ioc, unsigned long arg)
err = security_locked_down(LOCKDOWN_MSR);
if (err)
break;
+
+ err = filter_write(regs[1]);
+ if (err)
+ return err;
+
+ add_taint(TAINT_CPU_OUT_OF_SPEC, LOCKDEP_STILL_OK);
+
err = wrmsr_safe_regs_on_cpu(cpu, regs);
if (err)
break;
--
2.27.0


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