On Thu, Nov 26, 2020 at 09:24:29AM +0100, Greg Kroah-Hartman wrote:
> On Thu, Nov 26, 2020 at 01:10:55PM +0800, lijiazi wrote:
> > If usb drivers set a invalid value, for example, a negative
> > value. then a userspace task
> > cat sys/class/typec/port0/power_operation_mode, will cause a
> > panic issue:
> > [154325.262827] Unable to handle kernel paging request at virtual
> > address ffffff980aad8b68
> > [154325.262838] Mem abort info:
> > [154325.262843] ESR = 0x96000005
> > [154325.262849] Exception class = DABT (current EL), IL = 32 bits
> > [154325.262855] SET = 0, FnV = 0
> > [154325.262860] EA = 0, S1PTW = 0
> > [154325.262865] Data abort info:
> > [154325.262870] ISV = 0, ISS = 0x00000005
> > [154325.262875] CM = 0, WnR = 0
> > [154325.262880] swapper pgtable: 4k pages, 39-bit VAs, pgdp =
> > 000000001cae9c14
> > [154325.262884] [ffffff980aad8b68] pgd=0000000000000000,
> > pud=0000000000000000
> > [154325.262891] Internal error: Oops: 96000005 [#1] PREEMPT SMP
> > [154325.262896] Modules linked in: rmnet_perf(O) rmnet_shs(O)
> > wlan(O) sla(O) exfat(O) machine_dlkm(O) tfa98xx_dlkm(O)
> > cs35l41_dlkm(O) wcd938x_slave_dlkm(O) wcd938x_dlkm(O)
> > wcd9xxx_dlkm(O) mbhc_dlkm(O) tx_macro_dlkm(O) rx_macro_dlkm(O)
> > va_macro_dlkm(O) wsa_macro_dlkm(O) swr_ctrl_dlkm(O)
> > bolero_cdc_dlkm(O) wsa881x_dlkm(O) wcd_core_dlkm(O) stub_dlkm(O)
> > hdmi_dlkm(O) swr_dlkm(O) pinctrl_lpi_dlkm(O) pinctrl_wcd_dlkm(O)
> > usf_dlkm(O) native_dlkm(O) platform_dlkm(O) q6_dlkm(O)
> > adsp_loader_dlkm(O) apr_dlkm(O) snd_event_dlkm(O)
> > q6_notifier_dlkm(O) q6_pdr_dlkm(O) [last unloaded: rmnet_perf]
> > [154325.262939] Process usb@1.2-service (pid: 2501, stack limit
> > = 0x00000000cb0343ac)
> > [154325.262946] CPU: 5 PID: 2501 Comm: usb@1.2-service Tainted:
> > G S W O 4.19.113-perf-g0307705d321bc #1
> > [154325.262950] Hardware name: Qualcomm Technologies, Inc.
> > xiaomi cas (DT)
> > [154325.262955] pstate: 80400005 (Nzcv daif +PAN -UAO)
> > [154325.262967] pc : power_operation_mode_show+0x34/0x58
> > [154325.262971] lr : power_operation_mode_show+0x34/0x58
> > [154325.262974] sp : ffffffc1376bf990
> > [154325.262977] x29: ffffffc1376bf990 x28: ffffffc195aede58
> > [154325.262981] x27: ffffffc195aede48 x26: ffffff9008c55638
> > [154325.262986] x25: ffffffc05a44b300 x24: 0000000000001000
> > [154325.262990] x23: ffffffc19a340018 x22: ffffffc19a340018
> > [154325.262994] x21: ffffff900bb10038 x20: ffffff980aad8b68
> > [154325.262998] x19: ffffffc05a44b300 x18: 0000000000000000
> > [154325.263002] x17: 0000000000000000 x16: 0000000000000000
> > [154325.263006] x15: 0000000000000000 x14: 00000000080a38f8
> > [154325.263010] x13: ffffff880b489860 x12: 0000000000000000
> > [154325.263014] x11: 0000000000000000 x10: 1ffffff30155b16d
> > [154325.263018] x9 : 0000000000000000 x8 : 0000000000000007
> > [154325.263022] x7 : 0000000000000000 x6 : 000000000000003f
> > [154325.263026] x5 : 0000000000000040 x4 : 0000000000000000
> > [154325.263030] x3 : 0000000000000004 x2 : ffffffc05a44b300
> > [154325.263034] x1 : ffffff900bb10038 x0 : ffffff980aad8b68
> > [154325.263039]
> > [154325.263039] SP: 0xffffffc1376bf910:
> > [154325.263043] f910 00001000 00000000 5a44b300 ffffffc0
> > 08c55638 ffffff90 95aede48 ffffffc1
> > [154325.263052] f930 95aede58 ffffffc1 376bf990 ffffffc1
> > 09024b5c ffffff90 376bf990 ffffffc1
> > [154325.263060] f950 09024b5c ffffff90 80400005 00000000
> > 376bf9c0 ffffffc1 083cdf64 ffffff90
> > [154325.263067] f970 ffffffff 0000007f 376bfd80 ffffffc1
> > 376bf990 ffffffc1 09024b5c ffffff90
> > [154325.263075] f990 376bf9b0 ffffffc1 08c55678 ffffff90
> > 0bb10048 ffffff90 5a44b300 ffffffc0
> > [154325.263082] f9b0 376bf9e0 ffffffc1 085075e0 ffffff90
> > 0a5d43f8 ffffff90 9a9d9f00 ffffffc1
> > [154325.263090] f9d0 95aede48 ffffffc1 95aede58 ffffffc1
> > 376bfa30 ffffffc1 08506248 ffffff90
> > [154325.263097] f9f0 95aede40 ffffffc1 00000000 00000000
> > 00000001 00000000 9a9d9f00 ffffffc1
> > [154325.263106] Call trace:
> > [154325.263111] power_operation_mode_show+0x34/0x58
> > [154325.263116] dev_attr_show+0x40/0x80
> > [154325.263123] sysfs_kf_seq_show+0x110/0x1c0
> > [154325.263127] kernfs_seq_show+0x80/0x98
> > [154325.263133] seq_read+0x2d8/0x778
> > [154325.263136] kernfs_fop_read+0xa4/0x2a8
> > [154325.263142] __vfs_read+0xd4/0x2e8
> > [154325.263145] vfs_read+0xe0/0x1b0
> > [154325.263149] ksys_read+0xdc/0x170
> > [154325.263153] __arm64_sys_read+0x44/0x58
> > [154325.263158] el0_svc_common+0xd8/0x1d0
> > [154325.263162] el0_svc_handler+0x90/0xb8
> > [154325.263166] el0_svc+0x8/0xc
> >
> > Signed-off-by: lijiazi <lijiazi@xxxxxxxxxx>
>
> I need a name here that you sign legal documents with. If this is
> "ligiazi", that's fine, but at least capitalize it?
>
My Name is Jiazi Li.
> > ---
> > drivers/usb/typec/class.c | 2 ++
> > include/linux/usb/typec.h | 1 +
> > 2 files changed, 3 insertions(+)
> >
> > diff --git a/drivers/usb/typec/class.c b/drivers/usb/typec/class.c
> > index cb1362187..bcc8f79 100644
> > --- a/drivers/usb/typec/class.c
> > +++ b/drivers/usb/typec/class.c
> > @@ -1564,6 +1564,8 @@ void typec_set_pwr_opmode(struct typec_port *port,
> > {
> > struct device *partner_dev;
> >
> > + if (opmode >= TYPEC_PWR_MODE_MAX)
> > + return;
>
> Shouldn't we report the error somehow to userspace so they know they
> have a broken device that needs to be fixed?
>
This typec_set_pwr_opmode function has no return value, so just return.
> > if (port->pwr_opmode == opmode)
> > return;
> >
> > diff --git a/include/linux/usb/typec.h b/include/linux/usb/typec.h
> > index 5447532..e21c791 100644
> > --- a/include/linux/usb/typec.h
> > +++ b/include/linux/usb/typec.h
> > @@ -56,6 +56,7 @@ enum typec_pwr_opmode {
> > TYPEC_PWR_MODE_1_5A,
> > TYPEC_PWR_MODE_3_0A,
> > TYPEC_PWR_MODE_PD,
> > + TYPEC_PWR_MODE_MAX,
>
> If these are specific values that a device uses, then please set them to
> the specific values and don't just rely on the compiler to set the
> correctly.
>
This invalid value is generated by a faulty usb driver logic, so it
could be any vaule.
> thanks,
>
> greg k-h
