From 78004e9a87f240df03e2f73120d291763c32e0a7 Mon Sep 17 00:00:00 2001 From: Ali Ahmet Memis Date: Fri, 21 Aug 2026 01:45:27 +0000 Subject: openrisc: fix arbitrary kernel memory access via or1k_atomic syscall sys_or1k_atomic() (syscall 244 in the "or1k" ABI) takes two user pointers, v1 and v2, and swaps the words they point to in hand-written assembly. l.lwz r29,0(r4) l.lwz r27,0(r5) l.sw 0(r4),r27 l.sw 0(r5),r29 The pointers are not checked with access_ok(). The four memory accesses also have no exception table entries. A caller passes a kernel address as either pointer, and the syscall reads from and writes to it directly. This gives an unprivileged process a kernel read/write primitive. It overwrites kernel data such as the sys_call_table, gaining code execution in kernel context. Check both pointers before entering the critical section. Add fixups for the four memory accesses so faults on valid but unmapped user addresses return -EFAULT. [shorne@gmail.com: fix comment style] Fixes: 9d02a4283e9c ("OpenRISC: Boot code") Cc: stable@vger.kernel.org Signed-off-by: Ali Ahmet Memis Signed-off-by: Stafford Horne --- sound/last.c | 29 +++++++++++++++++++++++++++++ 1 file changed, 29 insertions(+) create mode 100644 sound/last.c (limited to 'sound/last.c') diff --git a/sound/last.c b/sound/last.c new file mode 100644 index 000000000..f0bb98780 --- /dev/null +++ b/sound/last.c @@ -0,0 +1,29 @@ +// SPDX-License-Identifier: GPL-2.0-or-later +/* + * Advanced Linux Sound Architecture + * Copyright (c) by Jaroslav Kysela + */ + +#include +#include + +static int __init alsa_sound_last_init(void) +{ + struct snd_card *card; + int idx, ok = 0; + + printk(KERN_INFO "ALSA device list:\n"); + for (idx = 0; idx < SNDRV_CARDS; idx++) { + card = snd_card_ref(idx); + if (card) { + printk(KERN_INFO " #%i: %s\n", idx, card->longname); + snd_card_unref(card); + ok++; + } + } + if (ok == 0) + printk(KERN_INFO " No soundcards found.\n"); + return 0; +} + +late_initcall_sync(alsa_sound_last_init); -- cgit v1.3.1