Affected: Linux

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

drivers: perf: Do not broadcast to other cpus when starting a counter

This command:

$ perf record -e cycles:k -e instructions:k -c 10000 -m 64M dd if=/dev/zero of=/dev/null count=1000

gives rise to this kernel warning:

[ 444.364395] WARNING: CPU: 0 PID: 104 at kernel/smp.c:775 smp_call_function_many_cond+0x42c/0x436 [ 444.364515] Modules linked in: [ 444.364657] CPU: 0 PID: 104 Comm: perf-exec Not tainted 6.6.0-rc6-00051-g391df82e8ec3-dirty #73 [ 444.364771] Hardware name: riscv-virtio,qemu (DT) [ 444.364868] epc : smp_call_function_many_cond+0x42c/0x436 [ 444.364917] ra : on_each_cpu_cond_mask+0x20/0x32 [ 444.364948] epc : ffffffff8009f9e0 ra : ffffffff8009fa5a sp : ff20000000003800 [ 444.364966] gp : ffffffff81500aa0 tp : ff60000002b83000 t0 : ff200000000038c0 [ 444.364982] t1 : ffffffff815021f0 t2 : 000000000000001f s0 : ff200000000038b0 [ 444.364998] s1 : ff60000002c54d98 a0 : ff60000002a73940 a1 : 0000000000000000 [ 444.365013] a2 : 0000000000000000 a3 : 0000000000000003 a4 : 0000000000000100 [ 444.365029] a5 : 0000000000010100 a6 : 0000000000f00000 a7 : 0000000000000000 [ 444.365044] s2 : 0000000000000000 s3 : ffffffffffffffff s4 : ff60000002c54d98 [ 444.365060] s5 : ffffffff81539610 s6 : ffffffff80c20c48 s7 : 0000000000000000 [ 444.365075] s8 : 0000000000000000 s9 : 0000000000000001 s10: 0000000000000001 [ 444.365090] s11: ffffffff80099394 t3 : 0000000000000003 t4 : 0000…