x86/msr: Make source of unrecognised MSR writes unambiguous

In many cases, task_struct.comm isn't enough to distinguish the
offender, since for interpreted languages it's likely just going to be
"python3" or whatever. Add the pid to make it unambiguous.

 [ bp: Make the printk string a single line for easier grepping. ]

Signed-off-by: Chris Down <chris@chrisdown.name>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lkml.kernel.org/r/6f6fbd0ee6c99bc5e47910db700a6642159db01b.1598011595.git.chris@chrisdown.name

diff --git a/arch/x86/kernel/msr.c b/arch/x86/kernel/msr.c
index b03001dfc6134d7403dc46dfea52be8e1690e498..c0d40981065891995621d7b44fc8700877eee1a3 100644 (file)
--- a/arch/x86/kernel/msr.c
+++ b/arch/x86/kernel/msr.c
@@ -102,8 +102,8 @@ static int filter_write(u32 reg)
        if (reg == MSR_IA32_ENERGY_PERF_BIAS)
                return 0;
 
-       pr_err("Write to unrecognized MSR 0x%x by %s\n"
-              "Please report to x86@kernel.org\n", reg, current->comm);
+       pr_err("Write to unrecognized MSR 0x%x by %s (pid: %d). Please report to x86@kernel.org.\n",
+              reg, current->comm, current->pid);
 
        return 0;
 }