# git rev-parse -q --verify 3bf9c3bd86cdde4aa4d12c2705d93e1d90464710^{commit} 3bf9c3bd86cdde4aa4d12c2705d93e1d90464710 already have revision, skipping fetch # git checkout -q -f -B kisskb 3bf9c3bd86cdde4aa4d12c2705d93e1d90464710 # git clean -qxdf # < git log -1 # commit 3bf9c3bd86cdde4aa4d12c2705d93e1d90464710 # Author: Frederic Barrat # Date: Mon Jun 24 16:41:48 2019 +0200 # # ocxl: Fix concurrent AFU open and device removal # # If an ocxl device is unbound through sysfs at the same time its AFU is # being opened by a user process, the open code may dereference freed # stuctures, which can lead to kernel oops messages. You'd have to hit a # tiny time window, but it's possible. It's fairly easy to test by # making the time window bigger artificially. # # Fix it with a combination of 2 changes: # - when an AFU device is found in the IDR by looking for the device # minor number, we should hold a reference on the device until after # the context is allocated. A reference on the AFU structure is kept # when the context is allocated, so we can release the reference on # the device after the context allocation. # - with the fix above, there's still another even tinier window, # between the time the AFU device is found in the IDR and the # reference on the device is taken. We can fix this one by removing # the IDR entry earlier, when the device setup is removed, instead # of waiting for the 'release' device callback. With proper locking # around the IDR. # # Fixes: 75ca758adbaf ("ocxl: Create a clear delineation between ocxl backend & frontend") # Cc: stable@vger.kernel.org # v5.2+ # Signed-off-by: Frederic Barrat # Reviewed-by: Greg Kurz # Signed-off-by: Michael Ellerman # Link: https://lore.kernel.org/r/20190624144148.32022-1-fbarrat@linux.ibm.com # < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version # < git log --format=%s --max-count=1 3bf9c3bd86cdde4aa4d12c2705d93e1d90464710 # < make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc85xx_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- mpc85xx_defconfig # make -s -j 48 ARCH=powerpc O=/kisskb/build/powerpc-fixes_mpc85xx_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- In file included from /kisskb/src/include/linux/kernel.h:11:0, from /kisskb/src/include/linux/list.h:9, from /kisskb/src/include/linux/module.h:12, from /kisskb/src/drivers/net/ethernet/freescale/fs_enet/mac-scc.c:15: /kisskb/src/drivers/net/ethernet/freescale/fs_enet/mac-scc.c: In function 'allocate_bd': /kisskb/src/include/linux/err.h:22:49: warning: cast to pointer from integer of different size [-Wint-to-pointer-cast] #define IS_ERR_VALUE(x) unlikely((unsigned long)(void *)(x) >= (unsigned long)-MAX_ERRNO) ^ /kisskb/src/include/linux/compiler.h:78:42: note: in definition of macro 'unlikely' # define unlikely(x) __builtin_expect(!!(x), 0) ^ /kisskb/src/drivers/net/ethernet/freescale/fs_enet/mac-scc.c:139:6: note: in expansion of macro 'IS_ERR_VALUE' if (IS_ERR_VALUE(fep->ring_mem_addr)) ^ /kisskb/src/arch/powerpc/boot/dts/fsl/mpc8541cds.dts:330.3-21: Warning (pci_device_bus_num): /pci@e0008000/i8259@19000:bus-range: PCI bus number 1 out of range, expected (0 - 0) /kisskb/src/arch/powerpc/boot/dts/fsl/mpc8555cds.dts:330.3-21: Warning (pci_device_bus_num): /pci@e0008000/i8259@19000:bus-range: PCI bus number 1 out of range, expected (0 - 0) INFO: Uncompressed kernel (size 0xc60028) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xc60028) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xc60028) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xc60028) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xc60028) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xc60028) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xc60028) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xc60028) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xc60028) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xc60028) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xc60028) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xc60028) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xc60028) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xc60028) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xc60028) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) INFO: Uncompressed kernel (size 0xc4f824) overlaps the address of the wrapper(0x400000) INFO: Fixing the link_address of wrapper to (0xd00000) Image Name: Linux-5.4.0-g3bf9c3bd86cd Created: Fri Dec 6 23:57:55 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6095585 Bytes = 5952.72 KiB = 5.81 MiB Load Address: 00d00000 Entry Point: 00d002a4 Image Name: Linux-5.4.0-g3bf9c3bd86cd Created: Fri Dec 6 23:57:55 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6095272 Bytes = 5952.41 KiB = 5.81 MiB Load Address: 00d00000 Entry Point: 00d002a4 Image Name: Linux-5.4.0-g3bf9c3bd86cd Created: Fri Dec 6 23:57:54 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6064694 Bytes = 5922.55 KiB = 5.78 MiB Load Address: 00000000 Entry Point: 00000000 Image Name: Linux-5.4.0-g3bf9c3bd86cd Created: Fri Dec 6 23:57:56 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6095245 Bytes = 5952.39 KiB = 5.81 MiB Load Address: 00d00000 Entry Point: 00d002a4 Image Name: Linux-5.4.0-g3bf9c3bd86cd Created: Fri Dec 6 23:57:56 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6094945 Bytes = 5952.09 KiB = 5.81 MiB Load Address: 00d00000 Entry Point: 00d00314 Image Name: Linux-5.4.0-g3bf9c3bd86cd Created: Fri Dec 6 23:57:56 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6094958 Bytes = 5952.11 KiB = 5.81 MiB Load Address: 00d00000 Entry Point: 00d002a4 Image Name: Linux-5.4.0-g3bf9c3bd86cd Created: Fri Dec 6 23:57:56 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6094911 Bytes = 5952.06 KiB = 5.81 MiB Load Address: 00d00000 Entry Point: 00d002a4 Image Name: Linux-5.4.0-g3bf9c3bd86cd Created: Fri Dec 6 23:57:56 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6094945 Bytes = 5952.09 KiB = 5.81 MiB Load Address: 00d00000 Entry Point: 00d00314 Image Name: Linux-5.4.0-g3bf9c3bd86cd Created: Fri Dec 6 23:57:57 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6094913 Bytes = 5952.06 KiB = 5.81 MiB Load Address: 00d00000 Entry Point: 00d00314 Image Name: Linux-5.4.0-g3bf9c3bd86cd Created: Fri Dec 6 23:57:57 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6094909 Bytes = 5952.06 KiB = 5.81 MiB Load Address: 00d00000 Entry Point: 00d002a4 Image Name: Linux-5.4.0-g3bf9c3bd86cd Created: Fri Dec 6 23:57:57 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6094949 Bytes = 5952.10 KiB = 5.81 MiB Load Address: 00d00000 Entry Point: 00d00314 Image Name: Linux-5.4.0-g3bf9c3bd86cd Created: Fri Dec 6 23:57:57 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6095644 Bytes = 5952.78 KiB = 5.81 MiB Load Address: 00d00000 Entry Point: 00d002a4 Image Name: Linux-5.4.0-g3bf9c3bd86cd Created: Fri Dec 6 23:57:57 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6095439 Bytes = 5952.58 KiB = 5.81 MiB Load Address: 00d00000 Entry Point: 00d002a4 Image Name: Linux-5.4.0-g3bf9c3bd86cd Created: Fri Dec 6 23:57:57 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6094913 Bytes = 5952.06 KiB = 5.81 MiB Load Address: 00d00000 Entry Point: 00d002a4 Image Name: Linux-5.4.0-g3bf9c3bd86cd Created: Fri Dec 6 23:57:57 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6094946 Bytes = 5952.10 KiB = 5.81 MiB Load Address: 00d00000 Entry Point: 00d00314 Image Name: Linux-5.4.0-g3bf9c3bd86cd Created: Fri Dec 6 23:57:57 2019 Image Type: PowerPC Linux Kernel Image (gzip compressed) Data Size: 6094948 Bytes = 5952.10 KiB = 5.81 MiB Load Address: 00d00000 Entry Point: 00d002a4 Completed OK # rm -rf /kisskb/build/powerpc-fixes_mpc85xx_defconfig_powerpc-gcc5 # Build took: 0:01:57.954595