CVE-2025-39722

In the Linux kernel, the following vulnerability has been resolved:

crypto: caam - Prevent crash on suspend with iMX8QM / iMX8ULP

Since the CAAM on these SoCs is managed by another ARM core, called the SECO (Security Controller) on iMX8QM and Secure Enclave on iMX8ULP, which also reserves access to register page 0 suspend operations cannot touch this page.

This is similar to when running OPTEE, where OPTEE will reserve page 0.

Track this situation using a new state variable no_page0, reflecting if page 0 is reserved elsewhere, either by other management cores in SoC or by OPTEE.

Replace the optee_en check in suspend/resume with the new check.

optee_en cannot go away as it's needed elsewhere to gate OPTEE specific situations.

Fixes the following splat at suspend:

Internal error: synchronous external abort: 0000000096000010 [#1] SMP
Hardware name: Freescale i.MX8QXP ACU6C (DT)
pstate: 60400005 (nZCv daif +PAN -UAO -TCO -DIT -SSBS BTYPE=--)
pc : readl+0x0/0x18
lr : rd_reg32+0x18/0x3c
sp : ffffffc08192ba20
x29: ffffffc08192ba20 x28: ffffff8025190000 x27: 0000000000000000
x26: ffffffc0808ae808 x25: ffffffc080922338 x24: ffffff8020e89090
x23: 0000000000000000 x22: ffffffc080922000 x21: ffffff8020e89010
x20: ffffffc080387ef8 x19: ffffff8020e89010 x18: 000000005d8000d5
x17: 0000000030f35963 x16: 000000008f785f3f x15: 000000003b8ef57c
x14: 00000000c418aef8 x13: 00000000f5fea526 x12: 0000000000000001
x11: 0000000000000002 x10: 0000000000000001 x9 : 0000000000000000
x8 : ffffff8025190870 x7 : ffffff8021726880 x6 : 0000000000000002
x5 : ffffff80217268f0 x4 : ffffff8021726880 x3 : ffffffc081200000
x2 : 0000000000000001 x1 : ffffff8020e89010 x0 : ffffffc081200004
Call trace:
 readl+0x0/0x18
 caam_ctrl_suspend+0x30/0xdc
 dpm_run_callback.constprop.0+0x24/0x5c
 device_suspend+0x170/0x2e8
 dpm_suspend+0xa0/0x104
 dpm_suspend_start+0x48/0x50
 suspend_devices_and_enter+0x7c/0x45c
 pm_suspend+0x148/0x160
 state_store+0xb4/0xf8
 kobj_attr_store+0x14/0x24
 sysfs_kf_write+0x38/0x48
 kernfs_fop_write_iter+0xb4/0x178
 vfs_write+0x118/0x178
 ksys_write+0x6c/0xd0
 __arm64_sys_write+0x14/0x1c
 invoke_syscall.constprop.0+0x64/0xb0
 do_el0_svc+0x90/0xb0
 el0_svc+0x18/0x44
 el0t_64_sync_handler+0x88/0x124
 el0t_64_sync+0x150/0x154
Code: 88dffc21 88dffc21 5ac00800 d65f03c0 (b9400000)