Thread (6 messages) flat view 6 messages, 3 authors, 2021-05-24

Re: [PATCH] arm64: mm: don't use CON and BLK mapping if KFENCE is enabled

From: Marco Elver <elver@google.com>
Date: 2021-05-24 10:44:13
Also in: lkml

On Mon, 24 May 2021 at 12:37, Mark Rutland [off-list ref] wrote:
On Mon, May 24, 2021 at 03:36:59PM +0800, Jisheng Zhang wrote:
quoted
Fix below warning if KFENCE=y but RODATA_FULL=n:

[    0.000000] ------------[ cut here ]------------
[    0.000000] WARNING: CPU: 0 PID: 0 at mm/memory.c:2462 apply_to_pmd_range+0xec/0x190
[    0.000000] CPU: 0 PID: 0 Comm: swapper/0 Not tainted 5.13.0-rc1+ #10
[    0.000000] Hardware name: linux,dummy-virt (DT)
[    0.000000] pstate: 600000c5 (nZCv daIF -PAN -UAO -TCO BTYPE=--)
[    0.000000] pc : apply_to_pmd_range+0xec/0x190
[    0.000000] lr : __apply_to_page_range+0x94/0x170
[    0.000000] sp : ffffffc010573e20
[    0.000000] x29: ffffffc010573e20 x28: ffffff801f400000 x27: ffffff801f401000
[    0.000000] x26: 0000000000000001 x25: ffffff801f400fff x24: ffffffc010573f28
[    0.000000] x23: ffffffc01002b710 x22: ffffffc0105fa450 x21: ffffffc010573ee4
[    0.000000] x20: ffffff801fffb7d0 x19: ffffff801f401000 x18: 00000000fffffffe
[    0.000000] x17: 000000000000003f x16: 000000000000000a x15: ffffffc01060b940
[    0.000000] x14: 0000000000000000 x13: 0098968000000000 x12: 0000000098968000
[    0.000000] x11: 0000000000000000 x10: 0000000098968000 x9 : 0000000000000001
[    0.000000] x8 : 0000000000000000 x7 : ffffffc010573ee4 x6 : 0000000000000001
[    0.000000] x5 : ffffffc010573f28 x4 : ffffffc01002b710 x3 : 0000000040000000
[    0.000000] x2 : ffffff801f5fffff x1 : 0000000000000001 x0 : 007800005f400705
[    0.000000] Call trace:
[    0.000000]  apply_to_pmd_range+0xec/0x190
[    0.000000]  __apply_to_page_range+0x94/0x170
[    0.000000]  apply_to_page_range+0x10/0x20
[    0.000000]  __change_memory_common+0x50/0xdc
[    0.000000]  set_memory_valid+0x30/0x40
[    0.000000]  kfence_init_pool+0x9c/0x16c
[    0.000000]  kfence_init+0x20/0x98
[    0.000000]  start_kernel+0x284/0x3f8

Fixes: 840b23986344 ("arm64, kfence: enable KFENCE for ARM64")
Signed-off-by: Jisheng Zhang <redacted>
It would be good if the commit message could explain the problem more
thoroughly, e.g.

| When we added KFENCE support for arm64, we intended that it would
| force the entire linear map to be mapped at page granularity, but we
| only enforced this in arch_add_memory() and not in map_mem(), so
| memory mapped at boot time can be mapped at a larger granularity.
|
| When booting a kernel with KFENCE=y and RODATA_FULL=n, this results in
| the following WARNING at boot:
|
| < warning here >

With that:

Acked-by: Mark Rutland <mark.rutland@arm.com>
We also need "Cc: stable@vger.kernel.org", right?

Acked-by: Marco Elver <elver@google.com>

Thank you both!

-- Marco

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