In the Linux kernel, the following vulnerability has been resolved: sh: cpuinfo: Fix a warning for CONFIGCPUMASKOFFSTACK When CONFIGCPUMASKOFFSTACK and CONFIGDEBUGPERCPUMAPS are selected, cpumaxbitswarn() generates a runtime warning similar as below when showing /proc/cpuinfo. Fix this by using nrcpuids (the runtime limit) instead of NRCPUS to iterate CPUs. [ 3.052463] ------------[ cut here ]------------ [ 3.059679] WARNING: CPU: 3 PID: 1 at include/linux/cpumask.h:108 showcpuinfo+0x5e8/0x5f0 [ 3.070072] Modules linked in: efivarfs autofs4 [ 3.076257] CPU: 0 PID: 1 Comm: systemd Not tainted 5.19-rc5+ #1052 [ 3.099465] Stack : 9000000100157b08 9000000000f18530 9000000000cf846c 9000000100154000 [ 3.109127] 9000000100157a50 0000000000000000 9000000100157a58 9000000000ef7430 [ 3.118774] 90000001001578e8 0000000000000040 0000000000000020 ffffffffffffffff [ 3.128412] 0000000000aaaaaa 1ab25f00eec96a37 900000010021de80 900000000101c890 [ 3.138056] 0000000000000000 0000000000000000 0000000000000000 0000000000aaaaaa [ 3.147711] ffff8000339dc220 0000000000000001 0000000006ab4000 0000000000000000 [ 3.157364] 900000000101c998 0000000000000004 9000000000ef7430 0000000000000000 [ 3.167012] 0000000000000009 000000000000006c 0000000000000000 0000000000000000 [ 3.176641] 9000000000d3de08 9000000001639390 90000000002086d8 00007ffff0080286 [ 3.186260] 00000000000000b0 0000000000000004 0000000000000000 0000000000071c1c [ 3.195868] ... [ 3.199917] Call Trace: [ 3.203941] [<90000000002086d8>] showstack+0x38/0x14c [ 3.210666] [<9000000000cf846c>] dumpstacklvl+0x60/0x88 [ 3.217625] [<900000000023d268>] _warn+0xd0/0x100 [ 3.223958] [<9000000000cf3c90>] warnslowpathfmt+0x7c/0xcc [ 3.231150] [<9000000000210220>] showcpuinfo+0x5e8/0x5f0 [ 3.238080] [<90000000004f578c>] seqreaditer+0x354/0x4b4 [ 3.245098] [<90000000004c2e90>] newsyncread+0x17c/0x1c4 [ 3.252114] [<90000000004c5174>] vfsread+0x138/0x1d0 [ 3.258694] [<90000000004c55f8>] ksysread+0x70/0x100 [ 3.265265] [<9000000000cfde9c>] dosyscall+0x7c/0x94 [ 3.271820] [<9000000000202fe4>] handlesyscall+0xc4/0x160 [ 3.281824] ---[ end trace 8b484262b4b8c24c ]---
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