| From bippy-5f407fcff5a0 Mon Sep 17 00:00:00 2001 |
| From: Greg Kroah-Hartman <gregkh@linuxfoundation.org> |
| To: <linux-cve-announce@vger.kernel.org> |
| Reply-to: <cve@kernel.org>, <linux-kernel@vger.kernel.org> |
| Subject: CVE-2022-49666: powerpc/memhotplug: Add add_pages override for PPC |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| powerpc/memhotplug: Add add_pages override for PPC |
| |
| With commit ffa0b64e3be5 ("powerpc: Fix virt_addr_valid() for 64-bit Book3E & 32-bit") |
| the kernel now validate the addr against high_memory value. This results |
| in the below BUG_ON with dax pfns. |
| |
| [ 635.798741][T26531] kernel BUG at mm/page_alloc.c:5521! |
| 1:mon> e |
| cpu 0x1: Vector: 700 (Program Check) at [c000000007287630] |
| pc: c00000000055ed48: free_pages.part.0+0x48/0x110 |
| lr: c00000000053ca70: tlb_finish_mmu+0x80/0xd0 |
| sp: c0000000072878d0 |
| msr: 800000000282b033 |
| current = 0xc00000000afabe00 |
| paca = 0xc00000037ffff300 irqmask: 0x03 irq_happened: 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 tlb_finish_mmu+0x80/0xd0 |
| [c0000000072878d0] c00000000053ca54 tlb_finish_mmu+0x64/0xd0 (unreliable) |
| [c000000007287900] c000000000539424 exit_mmap+0xe4/0x2a0 |
| [c0000000072879e0] c00000000019fc1c mmput+0xcc/0x210 |
| [c000000007287a20] c000000000629230 begin_new_exec+0x5e0/0xf40 |
| [c000000007287ae0] c00000000070b3cc load_elf_binary+0x3ac/0x1e00 |
| [c000000007287c10] c000000000627af0 bprm_execve+0x3b0/0xaf0 |
| [c000000007287cd0] c000000000628414 do_execveat_common.isra.0+0x1e4/0x310 |
| [c000000007287d80] c00000000062858c sys_execve+0x4c/0x60 |
| [c000000007287db0] c00000000002c1b0 system_call_exception+0x160/0x2c0 |
| [c000000007287e10] c00000000000c53c system_call_common+0xec/0x250 |
| |
| The fix is to make sure we update high_memory on memory hotplug. |
| This is similar to what x86 does in commit 3072e413e305 ("mm/memory_hotplug: introduce add_pages") |
| |
| The Linux kernel CVE team has assigned CVE-2022-49666 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.15.34 with commit fddb88bd266f4513abab7c36bca98935c9148a98 and fixed in 5.15.53 with commit 89296ac435e2cf8a5101f7fab8f0c7b754b92052 |
| Issue introduced in 5.18 with commit ffa0b64e3be58519ae472ea29a1a1ad681e32f48 and fixed in 5.18.10 with commit 84d146fd35a01b08e9515041de60f0f915a417d5 |
| Issue introduced in 5.18 with commit ffa0b64e3be58519ae472ea29a1a1ad681e32f48 and fixed in 5.19 with commit ac790d09885d36143076e7e02825c541e8eee899 |
| Issue introduced in 5.4.190 with commit deab81144d5a043f42804207fb76cfbd8a806978 |
| Issue introduced in 5.10.111 with commit d36febbcd537fcc50284e8b89609632d0146529f |
| Issue introduced in 5.16.20 with commit a3727c25eacd7e437c4f560957fa3a376fe93e6b |
| Issue introduced in 5.17.3 with commit cbc065efcba000ad8f615f506ebe61b6d3c5145b |
| |
| Please see https://www.kernel.org for a full list of currently supported |
| kernel versions by the kernel community. |
| |
| Unaffected versions might change over time as fixes are backported to |
| older supported kernel versions. The official CVE entry at |
| https://cve.org/CVERecord/?id=CVE-2022-49666 |
| will be updated if fixes are backported, please check that for the most |
| up to date information about this issue. |
| |
| |
| Affected files |
| ============== |
| |
| The file(s) affected by this issue are: |
| arch/powerpc/Kconfig |
| arch/powerpc/mm/mem.c |
| |
| |
| Mitigation |
| ========== |
| |
| The Linux kernel CVE team recommends that you update to the latest |
| stable kernel version for this, and many other bugfixes. Individual |
| changes are never tested alone, but rather are part of a larger kernel |
| release. Cherry-picking individual commits is not recommended or |
| supported by the Linux kernel community at all. If however, updating to |
| the latest release is impossible, the individual changes to resolve this |
| issue can be found at these commits: |
| https://git.kernel.org/stable/c/89296ac435e2cf8a5101f7fab8f0c7b754b92052 |
| https://git.kernel.org/stable/c/84d146fd35a01b08e9515041de60f0f915a417d5 |
| https://git.kernel.org/stable/c/ac790d09885d36143076e7e02825c541e8eee899 |
