| 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-2023-52506: LoongArch: Set all reserved memblocks on Node#0 at initialization |
| |
| Description |
| =========== |
| |
| In the Linux kernel, the following vulnerability has been resolved: |
| |
| LoongArch: Set all reserved memblocks on Node#0 at initialization |
| |
| After commit 61167ad5fecdea ("mm: pass nid to reserve_bootmem_region()") |
| we get a panic if DEFERRED_STRUCT_PAGE_INIT is enabled: |
| |
| [ 0.000000] CPU 0 Unable to handle kernel paging request at virtual address 0000000000002b82, era == 90000000040e3f28, ra == 90000000040e3f18 |
| [ 0.000000] Oops[#1]: |
| [ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 6.5.0+ #733 |
| [ 0.000000] pc 90000000040e3f28 ra 90000000040e3f18 tp 90000000046f4000 sp 90000000046f7c90 |
| [ 0.000000] a0 0000000000000001 a1 0000000000200000 a2 0000000000000040 a3 90000000046f7ca0 |
| [ 0.000000] a4 90000000046f7ca4 a5 0000000000000000 a6 90000000046f7c38 a7 0000000000000000 |
| [ 0.000000] t0 0000000000000002 t1 9000000004b00ac8 t2 90000000040e3f18 t3 90000000040f0800 |
| [ 0.000000] t4 00000000000f0000 t5 80000000ffffe07e t6 0000000000000003 t7 900000047fff5e20 |
| [ 0.000000] t8 aaaaaaaaaaaaaaab u0 0000000000000018 s9 0000000000000000 s0 fffffefffe000000 |
| [ 0.000000] s1 0000000000000000 s2 0000000000000080 s3 0000000000000040 s4 0000000000000000 |
| [ 0.000000] s5 0000000000000000 s6 fffffefffe000000 s7 900000000470b740 s8 9000000004ad4000 |
| [ 0.000000] ra: 90000000040e3f18 reserve_bootmem_region+0xec/0x21c |
| [ 0.000000] ERA: 90000000040e3f28 reserve_bootmem_region+0xfc/0x21c |
| [ 0.000000] CRMD: 000000b0 (PLV0 -IE -DA +PG DACF=CC DACM=CC -WE) |
| [ 0.000000] PRMD: 00000000 (PPLV0 -PIE -PWE) |
| [ 0.000000] EUEN: 00000000 (-FPE -SXE -ASXE -BTE) |
| [ 0.000000] ECFG: 00070800 (LIE=11 VS=7) |
| [ 0.000000] ESTAT: 00010800 [PIL] (IS=11 ECode=1 EsubCode=0) |
| [ 0.000000] BADV: 0000000000002b82 |
| [ 0.000000] PRID: 0014d000 (Loongson-64bit, Loongson-3A6000) |
| [ 0.000000] Modules linked in: |
| [ 0.000000] Process swapper (pid: 0, threadinfo=(____ptrval____), task=(____ptrval____)) |
| [ 0.000000] Stack : 0000000000000000 9000000002eb5430 0000003a00000020 90000000045ccd00 |
| [ 0.000000] 900000000470e000 90000000002c1918 0000000000000000 9000000004110780 |
| [ 0.000000] 00000000fe6c0000 0000000480000000 9000000004b4e368 9000000004110748 |
| [ 0.000000] 0000000000000000 900000000421ca84 9000000004620000 9000000004564970 |
| [ 0.000000] 90000000046f7d78 9000000002cc9f70 90000000002c1918 900000000470e000 |
| [ 0.000000] 9000000004564970 90000000040bc0e0 90000000046f7d78 0000000000000000 |
| [ 0.000000] 0000000000004000 90000000045ccd00 0000000000000000 90000000002c1918 |
| [ 0.000000] 90000000002c1900 900000000470b700 9000000004b4df78 9000000004620000 |
| [ 0.000000] 90000000046200a8 90000000046200a8 0000000000000000 9000000004218b2c |
| [ 0.000000] 9000000004270008 0000000000000001 0000000000000000 90000000045ccd00 |
| [ 0.000000] ... |
| [ 0.000000] Call Trace: |
| [ 0.000000] [<90000000040e3f28>] reserve_bootmem_region+0xfc/0x21c |
| [ 0.000000] [<900000000421ca84>] memblock_free_all+0x114/0x350 |
| [ 0.000000] [<9000000004218b2c>] mm_core_init+0x138/0x3cc |
| [ 0.000000] [<9000000004200e38>] start_kernel+0x488/0x7a4 |
| [ 0.000000] [<90000000040df0d8>] kernel_entry+0xd8/0xdc |
| [ 0.000000] |
| [ 0.000000] Code: 02eb21ad 00410f4c 380c31ac <262b818d> 6800b70d 02c1c196 0015001c 57fe4bb1 260002cd |
| |
| The reason is early memblock_reserve() in memblock_init() set node id to |
| MAX_NUMNODES, making NODE_DATA(nid) a NULL dereference in the call chain |
| reserve_bootmem_region() -> init_reserved_page(). After memblock_init(), |
| those late calls of memblock_reserve() operate on subregions of memblock |
| .memory regions. As a result, these reserved regions will be set to the |
| correct node at the first iteration of memmap_init_reserved_pages(). |
| |
| So set all reserved memblocks on Node#0 at initialization can avoid this |
| panic. |
| |
| The Linux kernel CVE team has assigned CVE-2023-52506 to this issue. |
| |
| |
| Affected and fixed versions |
| =========================== |
| |
| Issue introduced in 5.19 with commit fa96b57c149061f71a70bd6582d995f6424fbbf4 and fixed in 6.1.56 with commit f105e893a8edd48bdf4bef9fef845a9ff402f737 |
| Issue introduced in 5.19 with commit fa96b57c149061f71a70bd6582d995f6424fbbf4 and fixed in 6.5.6 with commit 19878758accf6b2788091a771d9f9fee7bab11ab |
| Issue introduced in 5.19 with commit fa96b57c149061f71a70bd6582d995f6424fbbf4 and fixed in 6.6 with commit b795fb9f5861ee256070d59e33130980a01fadd7 |
| |
| 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-2023-52506 |
| 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/loongarch/kernel/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/f105e893a8edd48bdf4bef9fef845a9ff402f737 |
| https://git.kernel.org/stable/c/19878758accf6b2788091a771d9f9fee7bab11ab |
| https://git.kernel.org/stable/c/b795fb9f5861ee256070d59e33130980a01fadd7 |
