CVE-2022-49666

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

powerpc/memhotplug: Add add_pages override for PPC

With commit ffa0b64e3be5 ("powerpc: Fix virtaddrvalid() for 64-bit Book3E & 32-bit") the kernel now validate the addr against highmemory value. This results in the below BUGON with dax pfns.

[ 635.798741][T26531] kernel BUG at mm/pagealloc.c:5521! 1:mon> e cpu 0x1: Vector: 700 (Program Check) at [c000000007287630] pc: c00000000055ed48: freepages.part.0+0x48/0x110 lr: c00000000053ca70: tlbfinishmmu+0x80/0xd0 sp: c0000000072878d0 msr: 800000000282b033 current = 0xc00000000afabe00 paca = 0xc00000037ffff300 irqmask: 0x03 irqhappened: 0x05 pid = 26531, comm = 50-landscape-sy kernel BUG at :5521! Linux version 5.19.0-rc3-14659-g4ec05be7c2e1 (kvaneesh@ltc-boston8) (gcc (Ubuntu 9.4.0-1ubuntu1~20.04.1) 9.4.0, GNU ld (GNU Binutils for Ubuntu) 2.34) #625 SMP Thu Jun 23 00:35:43 CDT 2022 1:mon> t [link register ] c00000000053ca70 tlbfinishmmu+0x80/0xd0 [c0000000072878d0] c00000000053ca54 tlbfinishmmu+0x64/0xd0 (unreliable) [c000000007287900] c000000000539424 exitmmap+0xe4/0x2a0 [c0000000072879e0] c00000000019fc1c mmput+0xcc/0x210 [c000000007287a20] c000000000629230 beginnewexec+0x5e0/0xf40 [c000000007287ae0] c00000000070b3cc loadelfbinary+0x3ac/0x1e00 [c000000007287c10] c000000000627af0 bprmexecve+0x3b0/0xaf0 [c000000007287cd0] c000000000628414 doexecveatcommon.isra.0+0x1e4/0x310 [c000000007287d80] c00000000062858c sysexecve+0x4c/0x60 [c000000007287db0] c00000000002c1b0 systemcallexception+0x160/0x2c0 [c000000007287e10] c00000000000c53c systemcallcommon+0xec/0x250

The fix is to make sure we update highmemory on memory hotplug. This is similar to what x86 does in commit 3072e413e305 ("mm/memoryhotplug: introduce add_pages")