On Tue, Mar 23, 2021 at 10:52 PM Erik Kaneda <erik.kaneda@xxxxxxxxx> wrote: > > From: Vegard Nossum <vegard.nossum@xxxxxxxxxx> > > ACPICA commit 29da9a2a3f5b2c60420893e5c6309a0586d7a329 > > ACPI is allocating an object using kmalloc(), but then frees it > using kmem_cache_free(<"Acpi-Namespace" kmem_cache>). > > This is wrong and can lead to boot failures manifesting like this: > > hpet0: 3 comparators, 64-bit 100.000000 MHz counter > clocksource: Switched to clocksource tsc-early > BUG: unable to handle page fault for address: 000000003ffe0018 > #PF: supervisor read access in kernel mode > #PF: error_code(0x0000) - not-present page > PGD 0 P4D 0 > Oops: 0000 [#1] SMP PTI > CPU: 0 PID: 1 Comm: swapper/0 Not tainted 5.6.0+ #211 > Hardware name: QEMU Standard PC (i440FX + PIIX, 1996), BIOS > Ubuntu-1.8.2-1ubuntu1 04/01/2014 > RIP: 0010:kmem_cache_alloc+0x70/0x1d0 > Code: 00 00 4c 8b 45 00 65 49 8b 50 08 65 4c 03 05 6f cc e7 7e 4d 8b > 20 4d 85 e4 0f 84 3d 01 00 00 8b 45 20 48 8b 7d 00 48 8d 4a 01 <49> 8b > 1c 04 4c 89 e0 65 48 0f c7 0f 0f 94 c0 84 c0 74 c5 8b 45 20 > RSP: 0000:ffffc90000013df8 EFLAGS: 00010206 > RAX: 0000000000000018 RBX: ffffffff81c49200 RCX: 0000000000000002 > RDX: 0000000000000001 RSI: 0000000000000dc0 RDI: 000000000002b300 > RBP: ffff88803e403d00 R08: ffff88803ec2b300 R09: 0000000000000001 > R10: 0000000000000dc0 R11: 0000000000000006 R12: 000000003ffe0000 > R13: ffffffff8110a583 R14: 0000000000000dc0 R15: ffffffff81c49a80 > FS: 0000000000000000(0000) GS:ffff88803ec00000(0000) > knlGS:0000000000000000 > CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 > CR2: 000000003ffe0018 CR3: 0000000001c0a001 CR4: 00000000003606f0 > DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 > DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 > Call Trace: > __trace_define_field+0x33/0xa0 > event_trace_init+0xeb/0x2b4 > tracer_init_tracefs+0x60/0x195 > ? register_tracer+0x1e7/0x1e7 > do_one_initcall+0x74/0x160 > kernel_init_freeable+0x190/0x1f0 > ? rest_init+0x9a/0x9a > kernel_init+0x5/0xf6 > ret_from_fork+0x35/0x40 > CR2: 000000003ffe0018 > ---[ end trace 707efa023f2ee960 ]--- > RIP: 0010:kmem_cache_alloc+0x70/0x1d0 > > Bisection leads to unrelated changes in slab; Vlastimil Babka > suggests an unrelated layout or slab merge change merely exposed > the underlying bug. > > Link: > https://lore.kernel.org/lkml/4dc93ff8-f86e-f4c9-ebeb-6d3153a78d03@xxxxxxxxxx/ > Link: > https://lore.kernel.org/r/a1461e21-c744-767d-6dfc-6641fd3e3ce2@xxxxxxxxxxx > Debugged-by: Vlastimil Babka <vbabka@xxxxxxx> > Debugged-by: Kees Cook <keescook@xxxxxxxxxxxx> > Reported-by: Jan Kiszka <jan.kiszka@xxxxxxxxxxx> > Fixes: f79c8e4136eac37255ead8875593ae33a2c16d20 ("ACPICA: Namespace: > simplify creation of the initial/default namespace") > > Link: https://github.com/acpica/acpica/commit/29da9a2a > Signed-off-by: Vegard Nossum <vegard.nossum@xxxxxxxxxx> > Signed-off-by: Bob Moore <robert.moore@xxxxxxxxx> > Signed-off-by: Erik Kaneda <erik.kaneda@xxxxxxxxx> > --- > drivers/acpi/acpica/nsaccess.c | 3 +-- > 1 file changed, 1 insertion(+), 2 deletions(-) > > diff --git a/drivers/acpi/acpica/nsaccess.c b/drivers/acpi/acpica/nsaccess.c > index 3f045b5953b2..a0c1a665dfc1 100644 > --- a/drivers/acpi/acpica/nsaccess.c > +++ b/drivers/acpi/acpica/nsaccess.c > @@ -99,13 +99,12 @@ acpi_status acpi_ns_root_initialize(void) > * just create and link the new node(s) here. > */ > new_node = > - ACPI_ALLOCATE_ZEROED(sizeof(struct acpi_namespace_node)); > + acpi_ns_create_node(*ACPI_CAST_PTR(u32, init_val->name)); > if (!new_node) { > status = AE_NO_MEMORY; > goto unlock_and_exit; > } > > - ACPI_COPY_NAMESEG(new_node->name.ascii, init_val->name); > new_node->descriptor_type = ACPI_DESC_TYPE_NAMED; > new_node->type = init_val->type; > > -- Applied as 5.12-rc material, thanks!
