APPLIED/Cmnt: [PATCH 0/1][SRU][N] UBSAN: shift-out-of-bounds in drivers/edac/skx_common.c:452:16

[Stefan Bader]

On 25/08/2025 07:41, AceLan Kao wrote:
> From: "Chia-Lin Kao (AceLan)" <acelan.kao at canonical.com>
> 
> BugLink: https://bugs.launchpad.net/bugs/2119713
> 
> [Impact]
> Shows the following UBSAN warning messages in dmesg
> 
> Jul 21 08:37:25 localhost kernel: UBSAN: shift-out-of-bounds in /build/linux-oem-6.14-44jeWy/linux-oem-6.14-6.14.0/drivers/edac/skx_common.c:452:16
> Jul 21 08:37:25 localhost kernel: shift exponent -66 is negative
> Jul 21 08:37:25 localhost kernel: CPU: 79 UID: 0 PID: 2454 Comm: (udev-worker) Not tainted 6.14.0-1006-oem #6-Ubuntu
> Jul 21 08:37:25 localhost kernel: Hardware name: Dell Inc. Dell Pro Max Tower T6 FCT6260/, BIOS 0.9.39 07/09/2025
> Jul 21 08:37:25 localhost kernel: Call Trace:
> Jul 21 08:37:25 localhost kernel: <TASK>
> Jul 21 08:37:25 localhost kernel: dump_stack_lvl+0x76/0xa0
> Jul 21 08:37:25 localhost kernel: dump_stack+0x10/0x20
> Jul 21 08:37:25 localhost kernel: __ubsan_handle_shift_out_of_bounds+0x1a5/0x380
> Jul 21 08:37:25 localhost kernel: skx_get_dimm_info.cold+0x2a/0x17f [skx_edac_common]
> Jul 21 08:37:25 localhost kernel: i10nm_get_dimm_config+0x1f9/0x300 [i10nm_edac]
> Jul 21 08:37:25 localhost kernel: skx_register_mci+0x139/0x1e0 [skx_edac_common]
> Jul 21 08:37:25 localhost kernel: ? __pfx_i10nm_get_dimm_config+0x10/0x10 [i10nm_edac]
> Jul 21 08:37:25 localhost kernel: i10nm_init+0x42b/0xff0 [i10nm_edac]
> Jul 21 08:37:25 localhost kernel: ? __pfx_i10nm_init+0x10/0x10 [i10nm_edac]
> 
> [Fix]
> In linux-next
> 2e6fe1bbefd9 EDAC/i10nm: Skip DIMM enumeration on a disabled memory controller
> 
> Intel provides a fix for this issue
> https://lore.kernel.org/lkml/20250806065707.3533345-1-qiuxu.zhuo@intel.com/
> 
> [Test]
> Boot up the Intel Granite Rapids and check dmesg log, there should be no UBSAN shift-out-of-bounds message.
> 
> [Where problems could occur]
> It adds extra check for edac i10nm driver, the impact should be low.
> 
> Qiuxu Zhuo (1):
>    EDAC/i10nm: Skip DIMM enumeration on a disabled memory controller
> 
>   drivers/edac/i10nm_base.c | 14 ++++++++++++++
>   1 file changed, 14 insertions(+)
> 


Applied to noble:linux/master-next. The bug report suggests this is 
required for at least Plucky as well. Submitting things affecting 
multiple series individually should be avoided. Normal SRU policy would 
prevent us from taking this into Noble. Please follow up with Q/P ASAP! 
Thanks.

-Stefan

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