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Message-ID: <YGVlnbTIVsps8FeJ@kroah.com> Date: Thu, 1 Apr 2021 08:18:05 +0200 From: Greg Kroah-Hartman <gregkh@...uxfoundation.org> To: Tetsuo Handa <penguin-kernel@...ove.sakura.ne.jp> Cc: Arnd Bergmann <arnd@...db.de>, linux-kernel@...r.kernel.org Subject: Re: [PATCH] misc: vmw_vmci: initialize payload passed to vmci_send_datagram() On Thu, Apr 01, 2021 at 02:57:47PM +0900, Tetsuo Handa wrote: > KMSAN complains that the vmci_use_ppn64() == false path in > vmci_dbell_register_notification_bitmap() left upper 32bits of > bitmap_set_msg.bitmap_ppn64 member uninitialized. > > KMSAN also complains that vmci_check_host_caps() left the payload part > of check_msg uninitialized. > > [ 21.458023][ T1] vmw_vmci 0000:00:07.7: Found VMCI PCI device at 0x11080, irq 16 > [ 21.461252][ T1] vmw_vmci 0000:00:07.7: Using capabilities 0xc > [ 21.463199][ T1] ===================================================== > [ 21.465014][ T1] BUG: KMSAN: uninit-value in kmsan_check_memory+0xd/0x10 > [ 21.465014][ T1] CPU: 1 PID: 1 Comm: swapper/0 Not tainted 5.11.0-rc7+ #4 > [ 21.465014][ T1] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 02/27/2020 > [ 21.465014][ T1] Call Trace: > [ 21.465014][ T1] dump_stack+0x21c/0x280 > [ 21.465014][ T1] kmsan_report+0xfb/0x1e0 > [ 21.465014][ T1] kmsan_internal_check_memory+0x484/0x520 > [ 21.465014][ T1] ? kmsan_get_metadata+0x116/0x180 > [ 21.465014][ T1] kmsan_check_memory+0xd/0x10 > [ 21.465014][ T1] iowrite8_rep+0x86/0x380 > [ 21.465014][ T1] vmci_send_datagram+0x150/0x280 > [ 21.465014][ T1] vmci_dbell_register_notification_bitmap+0x133/0x1e0 > [ 21.465014][ T1] vmci_guest_probe_device+0xcab/0x1e70 > [ 21.465014][ T1] ? vmci_send_datagram+0x280/0x280 > [ 21.465014][ T1] pci_device_probe+0xab3/0xe70 > [ 21.465014][ T1] ? pci_uevent+0x830/0x830 > [ 21.465014][ T1] really_probe+0xd16/0x24d0 > [ 21.465014][ T1] driver_probe_device+0x29d/0x3a0 > [ 21.465014][ T1] device_driver_attach+0x25a/0x490 > [ 21.465014][ T1] __driver_attach+0x78c/0x840 > [ 21.465014][ T1] ? kmsan_get_metadata+0x116/0x180 > [ 21.465014][ T1] bus_for_each_dev+0x210/0x340 > [ 21.465014][ T1] ? driver_attach+0xb0/0xb0 > [ 21.465014][ T1] driver_attach+0x89/0xb0 > [ 21.465014][ T1] bus_add_driver+0x677/0xc40 > [ 21.465014][ T1] driver_register+0x485/0x8e0 > [ 21.465014][ T1] __pci_register_driver+0x1ff/0x350 > [ 21.465014][ T1] vmci_guest_init+0x3e/0x41 > [ 21.465014][ T1] vmci_drv_init+0x1d6/0x43f > [ 21.465014][ T1] do_one_initcall+0x39c/0x9a0 > [ 21.465014][ T1] ? null_init+0x11dc/0x11dc > [ 21.465014][ T1] ? kmsan_get_metadata+0x116/0x180 > [ 21.465014][ T1] ? kmsan_get_shadow_origin_ptr+0x84/0xb0 > [ 21.465014][ T1] ? null_init+0x11dc/0x11dc > [ 21.465014][ T1] do_initcall_level+0x1d7/0x259 > [ 21.465014][ T1] do_initcalls+0x127/0x1cb > [ 21.465014][ T1] ? cpu_init_udelay+0xcf/0xcf > [ 21.465014][ T1] ? debug_boot_weak_hash_enable+0x61/0x61 > [ 21.465014][ T1] do_basic_setup+0x33/0x36 > [ 21.465014][ T1] kernel_init_freeable+0x29a/0x3ed > [ 21.465014][ T1] ? rest_init+0x1f0/0x1f0 > [ 21.465014][ T1] kernel_init+0x1f/0x840 > [ 21.465014][ T1] ? rest_init+0x1f0/0x1f0 > [ 21.465014][ T1] ret_from_fork+0x1f/0x30 > [ 21.465014][ T1] > [ 21.465014][ T1] Local variable ----bitmap_set_msg@...i_dbell_register_notification_bitmap created at: > [ 21.465014][ T1] vmci_dbell_register_notification_bitmap+0x50/0x1e0 > [ 21.465014][ T1] vmci_dbell_register_notification_bitmap+0x50/0x1e0 > [ 21.465014][ T1] > [ 21.465014][ T1] Bytes 28-31 of 32 are uninitialized > [ 21.465014][ T1] Memory access of size 32 starts at ffff88810098f570 > [ 21.465014][ T1] ===================================================== > [ 21.465014][ T1] Disabling lock debugging due to kernel taint > [ 21.539748][ T1] ===================================================== > [ 21.541627][ T1] BUG: KMSAN: uninit-value in kmsan_check_memory+0xd/0x10 > [ 21.543636][ T1] CPU: 1 PID: 1 Comm: swapper/0 Tainted: G B 5.11.0-rc7+ #4 > [ 21.546134][ T1] Hardware name: VMware, Inc. VMware Virtual Platform/440BX Desktop Reference Platform, BIOS 6.00 02/27/2020 > [ 21.549126][ T1] Call Trace: > [ 21.549639][ T1] dump_stack+0x21c/0x280 > [ 21.549639][ T1] kmsan_report+0xfb/0x1e0 > [ 21.549639][ T1] kmsan_internal_check_memory+0x202/0x520 > [ 21.549639][ T1] ? kmsan_get_metadata+0x116/0x180 > [ 21.549639][ T1] kmsan_check_memory+0xd/0x10 > [ 21.549639][ T1] iowrite8_rep+0x86/0x380 > [ 21.549639][ T1] vmci_guest_probe_device+0xf0b/0x1e70 > [ 21.549639][ T1] ? vmci_send_datagram+0x280/0x280 > [ 21.549639][ T1] pci_device_probe+0xab3/0xe70 > [ 21.549639][ T1] ? pci_uevent+0x830/0x830 > [ 21.549639][ T1] really_probe+0xd16/0x24d0 > [ 21.549639][ T1] driver_probe_device+0x29d/0x3a0 > [ 21.549639][ T1] device_driver_attach+0x25a/0x490 > [ 21.549639][ T1] __driver_attach+0x78c/0x840 > [ 21.549639][ T1] ? kmsan_get_metadata+0x116/0x180 > [ 21.549639][ T1] bus_for_each_dev+0x210/0x340 > [ 21.549639][ T1] ? driver_attach+0xb0/0xb0 > [ 21.549639][ T1] driver_attach+0x89/0xb0 > [ 21.549639][ T1] bus_add_driver+0x677/0xc40 > [ 21.549639][ T1] driver_register+0x485/0x8e0 > [ 21.549639][ T1] __pci_register_driver+0x1ff/0x350 > [ 21.549639][ T1] vmci_guest_init+0x3e/0x41 > [ 21.549639][ T1] vmci_drv_init+0x1d6/0x43f > [ 21.549639][ T1] do_one_initcall+0x39c/0x9a0 > [ 21.549639][ T1] ? null_init+0x11dc/0x11dc > [ 21.549639][ T1] ? kmsan_get_metadata+0x116/0x180 > [ 21.549639][ T1] ? kmsan_get_shadow_origin_ptr+0x84/0xb0 > [ 21.549639][ T1] ? null_init+0x11dc/0x11dc > [ 21.549639][ T1] do_initcall_level+0x1d7/0x259 > [ 21.549639][ T1] do_initcalls+0x127/0x1cb > [ 21.549639][ T1] ? cpu_init_udelay+0xcf/0xcf > [ 21.549639][ T1] ? debug_boot_weak_hash_enable+0x61/0x61 > [ 21.549639][ T1] do_basic_setup+0x33/0x36 > [ 21.549639][ T1] kernel_init_freeable+0x29a/0x3ed > [ 21.549639][ T1] ? rest_init+0x1f0/0x1f0 > [ 21.549639][ T1] kernel_init+0x1f/0x840 > [ 21.549639][ T1] ? rest_init+0x1f0/0x1f0 > [ 21.549639][ T1] ret_from_fork+0x1f/0x30 > [ 21.549639][ T1] > [ 21.549639][ T1] Uninit was created at: > [ 21.549639][ T1] kmsan_internal_poison_shadow+0x5c/0xf0 > [ 21.549639][ T1] kmsan_slab_alloc+0x8d/0xe0 > [ 21.549639][ T1] kmem_cache_alloc+0x84f/0xe30 > [ 21.549639][ T1] vmci_guest_probe_device+0xd11/0x1e70 > [ 21.549639][ T1] pci_device_probe+0xab3/0xe70 > [ 21.549639][ T1] really_probe+0xd16/0x24d0 > [ 21.549639][ T1] driver_probe_device+0x29d/0x3a0 > [ 21.549639][ T1] device_driver_attach+0x25a/0x490 > [ 21.549639][ T1] __driver_attach+0x78c/0x840 > [ 21.549639][ T1] bus_for_each_dev+0x210/0x340 > [ 21.549639][ T1] driver_attach+0x89/0xb0 > [ 21.549639][ T1] bus_add_driver+0x677/0xc40 > [ 21.549639][ T1] driver_register+0x485/0x8e0 > [ 21.549639][ T1] __pci_register_driver+0x1ff/0x350 > [ 21.549639][ T1] vmci_guest_init+0x3e/0x41 > [ 21.549639][ T1] vmci_drv_init+0x1d6/0x43f > [ 21.549639][ T1] do_one_initcall+0x39c/0x9a0 > [ 21.549639][ T1] do_initcall_level+0x1d7/0x259 > [ 21.549639][ T1] do_initcalls+0x127/0x1cb > [ 21.549639][ T1] do_basic_setup+0x33/0x36 > [ 21.549639][ T1] kernel_init_freeable+0x29a/0x3ed > [ 21.549639][ T1] kernel_init+0x1f/0x840 > [ 21.549639][ T1] ret_from_fork+0x1f/0x30 > [ 21.549639][ T1] > [ 21.549639][ T1] Bytes 28-31 of 36 are uninitialized > [ 21.549639][ T1] Memory access of size 36 starts at ffff8881675e5f00 > [ 21.549639][ T1] ===================================================== > [ 21.639830][ T1] Guest personality initialized and is active > [ 21.642165][ T1] VMCI host device registered (name=vmci, major=10, minor=121) > > Signed-off-by: Tetsuo Handa <penguin-kernel@...ove.SAKURA.ne.jp> > --- What commit does this "fix"? Can you resend with a proper "Fixes:" tag so we know where it needs to be backported to? thanks, greg k-h
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