CVE-2025-21869

In the Linux kernel, the following vulnerability has been resolved:<br /> <br /> powerpc/code-patching: Disable KASAN report during patching via temporary mm<br /> <br /> Erhard reports the following KASAN hit on Talos II (power9) with kernel 6.13:<br /> <br /> [ 12.028126] ==================================================================<br /> [ 12.028198] BUG: KASAN: user-memory-access in copy_to_kernel_nofault+0x8c/0x1a0<br /> [ 12.028260] Write of size 8 at addr 0000187e458f2000 by task systemd/1<br /> <br /> [ 12.028346] CPU: 87 UID: 0 PID: 1 Comm: systemd Tainted: G T 6.13.0-P9-dirty #3<br /> [ 12.028408] Tainted: [T]=RANDSTRUCT<br /> [ 12.028446] Hardware name: T2P9D01 REV 1.01 POWER9 0x4e1202 opal:skiboot-bc106a0 PowerNV<br /> [ 12.028500] Call Trace:<br /> [ 12.028536] [c000000008dbf3b0] [c000000001656a48] dump_stack_lvl+0xbc/0x110 (unreliable)<br /> [ 12.028609] [c000000008dbf3f0] [c0000000006e2fc8] print_report+0x6b0/0x708<br /> [ 12.028666] [c000000008dbf4e0] [c0000000006e2454] kasan_report+0x164/0x300<br /> [ 12.028725] [c000000008dbf600] [c0000000006e54d4] kasan_check_range+0x314/0x370<br /> [ 12.028784] [c000000008dbf640] [c0000000006e6310] __kasan_check_write+0x20/0x40<br /> [ 12.028842] [c000000008dbf660] [c000000000578e8c] copy_to_kernel_nofault+0x8c/0x1a0<br /> [ 12.028902] [c000000008dbf6a0] [c0000000000acfe4] __patch_instructions+0x194/0x210<br /> [ 12.028965] [c000000008dbf6e0] [c0000000000ade80] patch_instructions+0x150/0x590<br /> [ 12.029026] [c000000008dbf7c0] [c0000000001159bc] bpf_arch_text_copy+0x6c/0xe0<br /> [ 12.029085] [c000000008dbf800] [c000000000424250] bpf_jit_binary_pack_finalize+0x40/0xc0<br /> [ 12.029147] [c000000008dbf830] [c000000000115dec] bpf_int_jit_compile+0x3bc/0x930<br /> [ 12.029206] [c000000008dbf990] [c000000000423720] bpf_prog_select_runtime+0x1f0/0x280<br /> [ 12.029266] [c000000008dbfa00] [c000000000434b18] bpf_prog_load+0xbb8/0x1370<br /> [ 12.029324] [c000000008dbfb70] [c000000000436ebc] __sys_bpf+0x5ac/0x2e00<br /> [ 12.029379] [c000000008dbfd00] [c00000000043a228] sys_bpf+0x28/0x40<br /> [ 12.029435] [c000000008dbfd20] [c000000000038eb4] system_call_exception+0x334/0x610<br /> [ 12.029497] [c000000008dbfe50] [c00000000000c270] system_call_vectored_common+0xf0/0x280<br /> [ 12.029561] --- interrupt: 3000 at 0x3fff82f5cfa8<br /> [ 12.029608] NIP: 00003fff82f5cfa8 LR: 00003fff82f5cfa8 CTR: 0000000000000000<br /> [ 12.029660] REGS: c000000008dbfe80 TRAP: 3000 Tainted: G T (6.13.0-P9-dirty)<br /> [ 12.029735] MSR: 900000000280f032 CR: 42004848 XER: 00000000<br /> [ 12.029855] IRQMASK: 0<br /> GPR00: 0000000000000169 00003fffdcf789a0 00003fff83067100 0000000000000005<br /> GPR04: 00003fffdcf78a98 0000000000000090 0000000000000000 0000000000000008<br /> GPR08: 0000000000000000 0000000000000000 0000000000000000 0000000000000000<br /> GPR12: 0000000000000000 00003fff836ff7e0 c000000000010678 0000000000000000<br /> GPR16: 0000000000000000 0000000000000000 00003fffdcf78f28 00003fffdcf78f90<br /> GPR20: 0000000000000000 0000000000000000 0000000000000000 00003fffdcf78f80<br /> GPR24: 00003fffdcf78f70 00003fffdcf78d10 00003fff835c7239 00003fffdcf78bd8<br /> GPR28: 00003fffdcf78a98 0000000000000000 0000000000000000 000000011f547580<br /> [ 12.030316] NIP [00003fff82f5cfa8] 0x3fff82f5cfa8<br /> [ 12.030361] LR [00003fff82f5cfa8] 0x3fff82f5cfa8<br /> [ 12.030405] --- interrupt: 3000<br /> [ 12.030444] ==================================================================<br /> <br /> Commit c28c15b6d28a ("powerpc/code-patching: Use temporary mm for<br /> Radix MMU") is inspired from x86 but unlike x86 is doesn&amp;#39;t disable<br /> KASAN reports during patching. This wasn&amp;#39;t a problem at the begining<br /> because __patch_mem() is not instrumented.<br /> <br /> Commit 465cabc97b42 ("powerpc/code-patching: introduce<br /> patch_instructions()") use copy_to_kernel_nofault() to copy several<br /> instructions at once. But when using temporary mm the destination is<br /> not regular kernel memory but a kind of kernel-like memory located<br /> in user address space. <br /> ---truncated---