# git rev-parse -q --verify 8acecf9eda1846b9be8114d9cd665fbc38af223e^{commit}
8acecf9eda1846b9be8114d9cd665fbc38af223e
already have revision, skipping fetch
# git checkout -q -f -B kisskb 8acecf9eda1846b9be8114d9cd665fbc38af223e
# git clean -qxdf
# < git log -1
# commit 8acecf9eda1846b9be8114d9cd665fbc38af223e
# Author: Russell Currey <ruscur@russell.cc>
# Date:   Wed Mar 22 14:53:22 2023 +1100
# 
#     powerpc/iommu: Fix notifiers being shared by PCI and VIO buses
#     
#     fail_iommu_setup() registers the fail_iommu_bus_notifier struct to both
#     PCI and VIO buses.  struct notifier_block is a linked list node, so this
#     causes any notifiers later registered to either bus type to also be
#     registered to the other since they share the same node.
#     
#     This causes issues in (at least) the vgaarb code, which registers a
#     notifier for PCI buses.  pci_notify() ends up being called on a vio
#     device, converted with to_pci_dev() even though it's not a PCI device,
#     and finally makes a bad access in vga_arbiter_add_pci_device() as
#     discovered with KASAN:
#     
#      BUG: KASAN: slab-out-of-bounds in vga_arbiter_add_pci_device+0x60/0xe00
#      Read of size 4 at addr c000000264c26fdc by task swapper/0/1
#     
#      Call Trace:
#        dump_stack_lvl+0x1bc/0x2b8 (unreliable)
#        print_report+0x3f4/0xc60
#        kasan_report+0x244/0x698
#        __asan_load4+0xe8/0x250
#        vga_arbiter_add_pci_device+0x60/0xe00
#        pci_notify+0x88/0x444
#        notifier_call_chain+0x104/0x320
#        blocking_notifier_call_chain+0xa0/0x140
#        device_add+0xac8/0x1d30
#        device_register+0x58/0x80
#        vio_register_device_node+0x9ac/0xce0
#        vio_bus_scan_register_devices+0xc4/0x13c
#        __machine_initcall_pseries_vio_device_init+0x94/0xf0
#        do_one_initcall+0x12c/0xaa8
#        kernel_init_freeable+0xa48/0xba8
#        kernel_init+0x64/0x400
#        ret_from_kernel_thread+0x5c/0x64
#     
#     Fix this by creating separate notifier_block structs for each bus type.
#     
#     Fixes: d6b9a81b2a45 ("powerpc: IOMMU fault injection")
#     Reported-by: Nageswara R Sastry <rnsastry@linux.ibm.com>
#     Signed-off-by: Russell Currey <ruscur@russell.cc>
#     Tested-by: Nageswara R Sastry <rnsastry@linux.ibm.com>
#     Reviewed-by: Andrew Donnellan <ajd@linux.ibm.com>
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Link: https://msgid.link/20230322035322.328709-1-ruscur@russell.cc
# < /opt/cross/kisskb/korg/gcc-13.1.0-nolibc/x86_64-linux/bin/x86_64-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-13.1.0-nolibc/x86_64-linux/bin/x86_64-linux-ld --version
# < git log --format=%s --max-count=1 8acecf9eda1846b9be8114d9cd665fbc38af223e
# make -s -j 32 ARCH=x86 O=/kisskb/build/powerpc-next_x86_64_defconfig_x86_64-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  x86_64_defconfig
# < make -s -j 32 ARCH=x86 O=/kisskb/build/powerpc-next_x86_64_defconfig_x86_64-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  help
# make -s -j 32 ARCH=x86 O=/kisskb/build/powerpc-next_x86_64_defconfig_x86_64-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  olddefconfig
# make -s -j 32 ARCH=x86 O=/kisskb/build/powerpc-next_x86_64_defconfig_x86_64-gcc13 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-13.1.0-nolibc/x86_64-linux/bin/x86_64-linux-  
Completed OK
# rm -rf /kisskb/build/powerpc-next_x86_64_defconfig_x86_64-gcc13
# Build took: 0:02:22.128149