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[PATCH OLK-6.6 1/5] driver/svm: support SVSP feature, interface definition
by Yuan Can 23 Feb '24

23 Feb '24

From: Zhou Guanghui <zhouguanghui1(a)huawei.com> ascend inclusion category: feature bugzilla: https://gitee.com/openeuler/kernel/issues/I931MI CVE: NA ----------------------------------------------------------------- In the SVA scenario, the master device of the SMMU can access the address space of the process by the operation of binding process. The page table of the process is shared by the MMU and SMMU, In this case, if some addrss range cannot be accessed through the MMU, access to this address range needs to be isolated from the process page table. If the default domain of the SMMU is used, the isolation can be achieved. However, the address space created by default domain do not like the address space of the process which can be shared by multiple SMMUs. Therefore, we add a shadow virtual space of process. This address space is used only by the SMMU. Signed-off-by: Zhou Guanghui <zhouguanghui1(a)huawei.com> --- arch/arm64/Kconfig | 15 +++++++++++++++ kernel/fork.c | 1 + mm/mmap.c | 1 + 3 files changed, 17 insertions(+) diff --git a/arch/arm64/Kconfig b/arch/arm64/Kconfig index 67bc2ad13453..3e84b2572827 100644 --- a/arch/arm64/Kconfig +++ b/arch/arm64/Kconfig @@ -2455,6 +2455,21 @@ config DMI However, even with this option, the resultant kernel should continue to boot on existing non-UEFI platforms. +config ASCEND_SVSP + bool "Enable support for SVSP" + default n + depends on ARM_SMMU_V3_SVA + help + SVSP means Shadow Virtual Space of Process, which is an IO space used for + master device of SMMU. + + This space is only used for the master device, since the target address + after traslation by MMU is not an accessible physical address, but can + accessible by SMMU. + + Therefore, in the sva scenario, an svsp is created for each target process + address space. + endmenu # "Boot options" config COMPAT diff --git a/kernel/fork.c b/kernel/fork.c index 00e5886c9e04..735bc670b49e 100644 --- a/kernel/fork.c +++ b/kernel/fork.c @@ -1373,6 +1373,7 @@ struct mm_struct *mm_alloc(void) memset(mm, 0, sizeof(*mm)); return mm_init(mm, current, current_user_ns()); } +EXPORT_SYMBOL_GPL(mm_alloc); static inline void __mmput(struct mm_struct *mm) { diff --git a/mm/mmap.c b/mm/mmap.c index 21d1fc39bf21..5d78ebaeed60 100644 --- a/mm/mmap.c +++ b/mm/mmap.c @@ -2684,6 +2684,7 @@ int do_munmap(struct mm_struct *mm, unsigned long start, size_t len, return do_vmi_munmap(&vmi, mm, start, len, uf, false); } +EXPORT_SYMBOL(do_munmap); static unsigned long __mmap_region(struct mm_struct *mm, struct file *file, unsigned long addr, -- 2.17.1

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[PATCH OLK-5.10 v3 0/2] CVE-2023-52435
by Ziyang Xuan 23 Feb '24

23 Feb '24

Patchset for CVE-2023-52435. v3: - Fix comment head of patch 2. v2: - Fix comment head of patch 1. - Fix compile warning of patch 1. Eric Dumazet (1): net: prevent mss overflow in skb_segment() Ziyang Xuan (1): net: Fix compile warning in skb_segment() net/core/skbuff.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) -- 2.25.1

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[PATCH OLK-6.6 0/9] Support PV sched feature
by lishusen 22 Feb '24

22 Feb '24

PV sched supports the vCPU preemption check to enhance lock performance on overcommitted hosts. Paravirtualized spinlocks allow a pvops backend to replace the spinlock implementation with something virtualization-friendly. PV qspinlock has a minimal impact on native kernels and gives a nice performance benefit on paravirtualized KVM kernels. Zengruan Ye (9): KVM: arm64: Document PV-sched interface KVM: arm64: Implement PV_SCHED_FEATURES call KVM: arm64: Support pvsched preempted via shared structure KVM: arm64: Add interface to support vCPU preempted check KVM: arm64: Support the vCPU preemption check KVM: arm64: Add SMCCC PV-sched to kick cpu KVM: arm64: Implement PV_SCHED_KICK_CPU call KVM: arm64: Enable PV qspinlock KVM: arm64: Add tracepoints for PV qspinlock Documentation/virt/kvm/arm/pvsched.rst | 74 ++++++++ arch/arm64/Kconfig | 24 +++ arch/arm64/include/asm/Kbuild | 1 - arch/arm64/include/asm/kvm_host.h | 38 ++++ arch/arm64/include/asm/paravirt.h | 49 +++++ arch/arm64/include/asm/pvsched-abi.h | 16 ++ arch/arm64/include/asm/qspinlock.h | 48 +++++ arch/arm64/include/asm/qspinlock_paravirt.h | 12 ++ arch/arm64/include/asm/spinlock.h | 11 ++ arch/arm64/kernel/Makefile | 3 +- arch/arm64/kernel/paravirt-spinlocks.c | 21 +++ arch/arm64/kernel/paravirt.c | 187 ++++++++++++++++++++ arch/arm64/kernel/trace-paravirt.h | 66 +++++++ arch/arm64/kvm/Makefile | 2 +- arch/arm64/kvm/arm.c | 15 +- arch/arm64/kvm/handle_exit.c | 1 + arch/arm64/kvm/hypercalls.c | 20 +++ arch/arm64/kvm/pvsched.c | 82 +++++++++ arch/arm64/kvm/trace_arm.h | 18 ++ include/linux/arm-smccc.h | 25 +++ include/linux/cpuhotplug.h | 1 + 21 files changed, 710 insertions(+), 4 deletions(-) create mode 100644 Documentation/virt/kvm/arm/pvsched.rst create mode 100644 arch/arm64/include/asm/pvsched-abi.h create mode 100644 arch/arm64/include/asm/qspinlock.h create mode 100644 arch/arm64/include/asm/qspinlock_paravirt.h create mode 100644 arch/arm64/kernel/paravirt-spinlocks.c create mode 100644 arch/arm64/kernel/trace-paravirt.h create mode 100644 arch/arm64/kvm/pvsched.c -- 2.33.0

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[openeuler:OLK-6.6 2392/3331] arch/arm64/kernel/ipi_nmi.c:39:9: error: implicit declaration of function '__printk_safe_enter'
by kernel test robot 22 Feb '24

22 Feb '24

tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: 0b30804544e281a67d384ea10249544d92a69e2f commit: 5e3e94b1477ca3f6cb47ae8137a4a99fe0ef6147 [2392/3331] arm64: Add non nmi ipi backtrace support config: arm64-randconfig-r064-20240222 (https://download.01.org/0day-ci/archive/20240222/202402222006.PH9PlsbP-lkp@…) compiler: aarch64-linux-gcc (GCC) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240222/202402222006.PH9PlsbP-lkp@…) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp(a)intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202402222006.PH9PlsbP-lkp@intel.com/ All errors (new ones prefixed by >>): arch/arm64/kernel/ipi_nmi.c: In function 'ipi_cpu_backtrace': >> arch/arm64/kernel/ipi_nmi.c:39:9: error: implicit declaration of function '__printk_safe_enter' [-Werror=implicit-function-declaration] 39 | __printk_safe_enter(); | ^~~~~~~~~~~~~~~~~~~ >> arch/arm64/kernel/ipi_nmi.c:41:9: error: implicit declaration of function '__printk_safe_exit' [-Werror=implicit-function-declaration] 41 | __printk_safe_exit(); | ^~~~~~~~~~~~~~~~~~ cc1: some warnings being treated as errors vim +/__printk_safe_enter +39 arch/arm64/kernel/ipi_nmi.c 35 36 #ifdef CONFIG_NON_NMI_IPI_BACKTRACE 37 static void ipi_cpu_backtrace(void *info) 38 { > 39 __printk_safe_enter(); 40 nmi_cpu_backtrace(get_irq_regs()); > 41 __printk_safe_exit(); 42 } 43 -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki

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[openeuler:OLK-6.6 2532/3331] dtbs_check: Documentation/devicetree/bindings/gpu/phytium,dc.yaml:40:8: [warning] wrong indentation: expected 2 but found 7 (indentation)
by kernel test robot 22 Feb '24

22 Feb '24

tree: https://gitee.com/openeuler/kernel.git OLK-6.6 head: 0b30804544e281a67d384ea10249544d92a69e2f commit: ab9ff1e38569313e41ba5a036591f93cb55e5d87 [2532/3331] DRM: Phytium display DRM doc compiler: loongarch64-linux-gcc (GCC) 13.2.0 reproduce: (https://download.01.org/0day-ci/archive/20240222/202402222050.6bOkmhbV-lkp@…) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp(a)intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202402222050.6bOkmhbV-lkp@intel.com/ dtcheck warnings: (new ones prefixed by >>) >> Documentation/devicetree/bindings/gpu/phytium,dc.yaml:40:8: [warning] wrong indentation: expected 2 but found 7 (indentation) Documentation/devicetree/bindings/arm/arm,mpam-msc.yaml:76:15: [error] string value is redundantly quoted with any quotes (quoted-strings) Documentation/devicetree/bindings/arm/arm,mpam-msc.yaml:82:15: [error] string value is redundantly quoted with any quotes (quoted-strings) -- Documentation/devicetree/bindings/iio/pressure/honeywell,mprls0025pa.yaml: properties:honeywell,pmin-pascal: '$ref' should not be valid under {'const': '$ref'} hint: Standard unit suffix properties don't need a type $ref from schema $id: http://devicetree.org/meta-schemas/core.yaml# Documentation/devicetree/bindings/iio/pressure/honeywell,mprls0025pa.yaml: properties:honeywell,pmax-pascal: '$ref' should not be valid under {'const': '$ref'} hint: Standard unit suffix properties don't need a type $ref from schema $id: http://devicetree.org/meta-schemas/core.yaml# >> Documentation/devicetree/bindings/gpu/phytium,dc.yaml: properties:clocks:items: 'anyOf' conditional failed, one must be fixed: ['description:Display controller reference clock source'] is not of type 'object', 'boolean' 'description:Display controller reference clock source' is not of type 'object', 'boolean' from schema $id: http://json-schema.org/draft-07/schema# >> Documentation/devicetree/bindings/gpu/phytium,dc.yaml: properties:clocks: 'oneOf' conditional failed, one must be fixed: ['description:Display controller reference clock source'] is too short False schema does not allow 1 hint: "minItems" is only needed if less than the "items" list length from schema $id: http://devicetree.org/meta-schemas/items.yaml# >> Documentation/devicetree/bindings/gpu/phytium,dc.yaml: properties:reg: 'oneOf' conditional failed, one must be fixed: [{'description': 'Offset and length of the memory mapped registers'}] is too short False schema does not allow 1 hint: "minItems" is only needed if less than the "items" list length from schema $id: http://devicetree.org/meta-schemas/items.yaml# >> Documentation/devicetree/bindings/gpu/phytium,dc.yaml: 'Example' is not one of ['$id', '$schema', 'title', 'description', 'examples', 'required', 'allOf', 'anyOf', 'oneOf', 'definitions', '$defs', 'additionalProperties', 'dependencies', 'dependentRequired', 'dependentSchemas', 'patternProperties', 'properties', 'not', 'if', 'then', 'else', 'unevaluatedProperties', 'deprecated', 'maintainers', 'select', '$ref'] from schema $id: http://devicetree.org/meta-schemas/base.yaml# >> Documentation/devicetree/bindings/gpu/phytium,dc.yaml: properties:clocks: 'oneOf' conditional failed, one must be fixed: >> Documentation/devicetree/bindings/gpu/phytium,dc.yaml: properties:clocks: 'anyOf' conditional failed, one must be fixed: 'maxItems' is a required property hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values. 'minItems' is not one of ['maxItems', 'description', 'deprecated'] hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values. 'items' is not one of ['maxItems', 'description', 'deprecated'] hint: Only "maxItems" is required for a single entry if there are no constraints defined for the values. 'minItems' is not one of ['description', 'deprecated', 'const', 'enum', 'minimum', 'maximum', 'multipleOf', 'default', '$ref', 'oneOf'] 'items' is not one of ['description', 'deprecated', 'const', 'enum', 'minimum', 'maximum', 'multipleOf', 'default', '$ref', 'oneOf'] ['description:Display controller reference clock source'] is valid under each of {'type': 'array', 'maxItems': 1, 'items': {'allOf': [{'$ref': '#/array'}], 'required': ['items']}}, {'type': 'array', 'items': {'$ref': '#/single'}} hint: "items" can be a list defining each entry or a schema applying to all items. A list has an implicit size. A schema requires minItems/maxItems to define the size. hint: cell array properties must define how many entries and what the entries are when there is more than one entry. from schema $id: http://devicetree.org/meta-schemas/clocks.yaml# 'minItems' is not one of ['type', 'description', 'dependencies', 'dependentRequired', 'dependentSchemas', 'properties', 'patternProperties', 'additionalProperties', 'unevaluatedProperties', 'deprecated', 'required', 'not', 'allOf', 'anyOf', 'oneOf', '$ref'] 'items' is not one of ['type', 'description', 'dependencies', 'dependentRequired', 'dependentSchemas', 'properties', 'patternProperties', 'additionalProperties', 'unevaluatedProperties', 'deprecated', 'required', 'not', 'allOf', 'anyOf', 'oneOf', '$ref'] 'type' is a required property hint: DT nodes ("object" type in schemas) can only use a subset of json-schema keywords from schema $id: http://devicetree.org/meta-schemas/clocks.yaml# >> Documentation/devicetree/bindings/gpu/phytium,dc.yaml: $id: Cannot determine base path from $id, relative path/filename doesn't match actual path or filename $id: http://devicetree.org/schemas/dc/snps,dc.yaml file: Documentation/devicetree/bindings/gpu/phytium,dc.yaml -- >> Documentation/devicetree/bindings/gpu/phytium,dc.yaml: ignoring, error in schema: properties: clocks: items /usr/local/lib/python3.11/dist-packages/dtschema/schemas/reserved-memory/memory-region.yaml: warning: ignoring duplicate '$id' value 'http://devicetree.org/schemas/reserved-memory/memory-region.yaml#' /usr/local/lib/python3.11/dist-packages/dtschema/schemas/reserved-memory/framebuffer.yaml: warning: ignoring duplicate '$id' value 'http://devicetree.org/schemas/reserved-memory/framebuffer.yaml#' /usr/local/lib/python3.11/dist-packages/dtschema/schemas/reserved-memory/shared-dma-pool.yaml: warning: ignoring duplicate '$id' value 'http://devicetree.org/schemas/reserved-memory/shared-dma-pool.yaml#' /usr/local/lib/python3.11/dist-packages/dtschema/schemas/reserved-memory/reserved-memory.yaml: warning: ignoring duplicate '$id' value 'http://devicetree.org/schemas/reserved-memory/reserved-memory.yaml#' Documentation/devicetree/bindings/media/i2c/ti,ds90ub960.yaml: i2c-alias: missing type definition Documentation/devicetree/bindings/net/snps,dwmac.yaml: mac-mode: missing type definition Documentation/devicetree/bindings/display/panel/advantech,idk-2121wr.yaml: dual-lvds-odd-pixels: missing type definition Documentation/devicetree/bindings/display/panel/advantech,idk-2121wr.yaml: dual-lvds-even-pixels: missing type definition Documentation/devicetree/bindings/sound/audio-graph.yaml: convert-sample-format: missing type definition vim +40 Documentation/devicetree/bindings/gpu/phytium,dc.yaml 33 34 required: 35 - compatible 36 - reg 37 - interrupts 38 39 Example: > 40 /memreserve/ 0xf4000000 0x4000000; // (optional) -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki

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[PATCH OLK-5.10 v2 0/2] CVE-2023-52435
by Ziyang Xuan 22 Feb '24

22 Feb '24

Patchset for CVE-2023-52435. v2: - Fix comment head of patch 1. - Fix compile warning of patch 1. Eric Dumazet (1): net: prevent mss overflow in skb_segment() Ziyang Xuan (1): net: Fix compile warning in skb_segment() net/core/skbuff.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) -- 2.25.1

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[PATCH openEuler-1.0-LTS v2 0/2] CVE-2023-52435
by Ziyang Xuan 22 Feb '24

22 Feb '24

Patchset for CVE-2023-52435. v2: - Fix comment head of patch 1. - Fix compile warning of patch 1. Eric Dumazet (1): net: prevent mss overflow in skb_segment() Ziyang Xuan (1): net: Fix compile warning in skb_segment() net/core/skbuff.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) -- 2.25.1

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[OLK-6.6 00/14] LoongArch: fix some known issue and update defconfig
by Hongchen Zhang 22 Feb '24

22 Feb '24

Bibo Mao (1): LoongArch: Implement constant timer shutdown interface Chong Qiao (1): irqchip/loongson-pch-pic: 7a1000 int_clear reg must use 64bit write. Hongchen Zhang (3): LoongArch: fix compile error caused by arch_trigger_cpumask_backtrace usb: xhci: add XHCI_NO_SOFT_RETRY quirk for EJ188 net: stmmac: fix potential double free of dma descriptor resources Huacai Chen (1): drm/radeon: Workaround radeon driver bug for Loongson Jianmin Lv (1): LoongArch: Remove generic irq migration Tianli Xiong (1): irqchip/loongson-liointc: Set different isr for differnt core Yingkun Meng (1): LoongArch: defconfig: Enable a large number of configurations Youling Tang (4): LoongArch: kdump: Add memory reservation for old kernel LoongArch: kexec: Add compatibility with old interfaces LoongArch: Fix kdump failure on v40 interface specification LoongArch: kdump: Add high memory reservation zhangtianyang (1): LoongArch: Adapted SECTION_SIZE_BITS with page size arch/loongarch/Kconfig | 1 - arch/loongarch/configs/loongson3_defconfig | 1577 +++++++++++++++-- arch/loongarch/include/asm/irq.h | 3 +- arch/loongarch/include/asm/sparsemem.h | 2 +- arch/loongarch/kernel/irq.c | 36 + arch/loongarch/kernel/machine_kexec.c | 45 +- arch/loongarch/kernel/process.c | 3 +- arch/loongarch/kernel/setup.c | 94 +- arch/loongarch/kernel/smp.c | 3 +- arch/loongarch/kernel/time.c | 23 +- drivers/gpu/drm/radeon/cik.c | 3 + drivers/gpu/drm/radeon/evergreen.c | 3 + drivers/gpu/drm/radeon/r600.c | 3 + drivers/gpu/drm/radeon/si.c | 3 + drivers/irqchip/irq-loongson-liointc.c | 4 +- drivers/irqchip/irq-loongson-pch-pic.c | 16 +- .../net/ethernet/stmicro/stmmac/stmmac_main.c | 11 + drivers/usb/host/xhci-pci.c | 6 + kernel/irq/Kconfig | 4 +- 19 files changed, 1639 insertions(+), 201 deletions(-) -- 2.33.0

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[PATCH OLK-5.10] net: prevent mss overflow in skb_segment()
by Ziyang Xuan 22 Feb '24

22 Feb '24

From: Eric Dumazet <edumazet(a)google.com> mainline inclusion from mainline-v6.7-rc6 commit 23d05d563b7e7b0314e65c8e882bc27eac2da8e7 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I92HXW CVE: CVE-2023-52435 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- Once again syzbot is able to crash the kernel in skb_segment() [1] GSO_BY_FRAGS is a forbidden value, but unfortunately the following computation in skb_segment() can reach it quite easily : mss = mss * partial_segs; 65535 = 3 * 5 * 17 * 257, so many initial values of mss can lead to a bad final result. Make sure to limit segmentation so that the new mss value is smaller than GSO_BY_FRAGS. [1] general protection fault, probably for non-canonical address 0xdffffc000000000e: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000070-0x0000000000000077] CPU: 1 PID: 5079 Comm: syz-executor993 Not tainted 6.7.0-rc4-syzkaller-00141-g1ae4cd3cbdd0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 RIP: 0010:skb_segment+0x181d/0x3f30 net/core/skbuff.c:4551 Code: 83 e3 02 e9 fb ed ff ff e8 90 68 1c f9 48 8b 84 24 f8 00 00 00 48 8d 78 70 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 8a 21 00 00 48 8b 84 24 f8 00 RSP: 0018:ffffc900043473d0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000010046 RCX: ffffffff886b1597 RDX: 000000000000000e RSI: ffffffff886b2520 RDI: 0000000000000070 RBP: ffffc90004347578 R08: 0000000000000005 R09: 000000000000ffff R10: 000000000000ffff R11: 0000000000000002 R12: ffff888063202ac0 R13: 0000000000010000 R14: 000000000000ffff R15: 0000000000000046 FS: 0000555556e7e380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020010000 CR3: 0000000027ee2000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> udp6_ufo_fragment+0xa0e/0xd00 net/ipv6/udp_offload.c:109 ipv6_gso_segment+0x534/0x17e0 net/ipv6/ip6_offload.c:120 skb_mac_gso_segment+0x290/0x610 net/core/gso.c:53 __skb_gso_segment+0x339/0x710 net/core/gso.c:124 skb_gso_segment include/net/gso.h:83 [inline] validate_xmit_skb+0x36c/0xeb0 net/core/dev.c:3626 __dev_queue_xmit+0x6f3/0x3d60 net/core/dev.c:4338 dev_queue_xmit include/linux/netdevice.h:3134 [inline] packet_xmit+0x257/0x380 net/packet/af_packet.c:276 packet_snd net/packet/af_packet.c:3087 [inline] packet_sendmsg+0x24c6/0x5220 net/packet/af_packet.c:3119 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0xd5/0x180 net/socket.c:745 __sys_sendto+0x255/0x340 net/socket.c:2190 __do_sys_sendto net/socket.c:2202 [inline] __se_sys_sendto net/socket.c:2198 [inline] __x64_sys_sendto+0xe0/0x1b0 net/socket.c:2198 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f8692032aa9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff8d685418 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f8692032aa9 RDX: 0000000000010048 RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00000000000f4240 R08: 0000000020000540 R09: 0000000000000014 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff8d685480 R13: 0000000000000001 R14: 00007fff8d685480 R15: 0000000000000003 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:skb_segment+0x181d/0x3f30 net/core/skbuff.c:4551 Code: 83 e3 02 e9 fb ed ff ff e8 90 68 1c f9 48 8b 84 24 f8 00 00 00 48 8d 78 70 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 8a 21 00 00 48 8b 84 24 f8 00 RSP: 0018:ffffc900043473d0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000010046 RCX: ffffffff886b1597 RDX: 000000000000000e RSI: ffffffff886b2520 RDI: 0000000000000070 RBP: ffffc90004347578 R08: 0000000000000005 R09: 000000000000ffff R10: 000000000000ffff R11: 0000000000000002 R12: ffff888063202ac0 R13: 0000000000010000 R14: 000000000000ffff R15: 0000000000000046 FS: 0000555556e7e380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020010000 CR3: 0000000027ee2000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Fixes: 3953c46c3ac7 ("sk_buff: allow segmenting based on frag sizes") Signed-off-by: Eric Dumazet <edumazet(a)google.com> Cc: Marcelo Ricardo Leitner <marcelo.leitner(a)gmail.com> Reviewed-by: Willem de Bruijn <willemb(a)google.com> Link: https://lore.kernel.org/r/20231212164621.4131800-1-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> Signed-off-by: Ziyang Xuan <william.xuanziyang(a)huawei.com> --- net/core/skbuff.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/core/skbuff.c b/net/core/skbuff.c index b5f01cebbb72..db6301c492c9 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -3955,8 +3955,9 @@ struct sk_buff *skb_segment(struct sk_buff *head_skb, /* GSO partial only requires that we trim off any excess that * doesn't fit into an MSS sized block, so take care of that * now. + * Cap len to not accidentally hit GSO_BY_FRAGS. */ - partial_segs = len / mss; + partial_segs = min(len, GSO_BY_FRAGS - 1) / mss; if (partial_segs > 1) mss *= partial_segs; else -- 2.25.1

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[PATCH openEuler-1.0-LTS] net: prevent mss overflow in skb_segment()
by Ziyang Xuan 22 Feb '24

22 Feb '24

From: Eric Dumazet <edumazet(a)google.com> mainline inclusion from mainline-v6.7-rc6 commit 23d05d563b7e7b0314e65c8e882bc27eac2da8e7 category: bugfix bugzilla: https://gitee.com/src-openeuler/kernel/issues/I92HXW CVE: CVE-2023-52435 Reference: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?… -------------------------------- Once again syzbot is able to crash the kernel in skb_segment() [1] GSO_BY_FRAGS is a forbidden value, but unfortunately the following computation in skb_segment() can reach it quite easily : mss = mss * partial_segs; 65535 = 3 * 5 * 17 * 257, so many initial values of mss can lead to a bad final result. Make sure to limit segmentation so that the new mss value is smaller than GSO_BY_FRAGS. [1] general protection fault, probably for non-canonical address 0xdffffc000000000e: 0000 [#1] PREEMPT SMP KASAN KASAN: null-ptr-deref in range [0x0000000000000070-0x0000000000000077] CPU: 1 PID: 5079 Comm: syz-executor993 Not tainted 6.7.0-rc4-syzkaller-00141-g1ae4cd3cbdd0 #0 Hardware name: Google Google Compute Engine/Google Compute Engine, BIOS Google 11/10/2023 RIP: 0010:skb_segment+0x181d/0x3f30 net/core/skbuff.c:4551 Code: 83 e3 02 e9 fb ed ff ff e8 90 68 1c f9 48 8b 84 24 f8 00 00 00 48 8d 78 70 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 8a 21 00 00 48 8b 84 24 f8 00 RSP: 0018:ffffc900043473d0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000010046 RCX: ffffffff886b1597 RDX: 000000000000000e RSI: ffffffff886b2520 RDI: 0000000000000070 RBP: ffffc90004347578 R08: 0000000000000005 R09: 000000000000ffff R10: 000000000000ffff R11: 0000000000000002 R12: ffff888063202ac0 R13: 0000000000010000 R14: 000000000000ffff R15: 0000000000000046 FS: 0000555556e7e380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020010000 CR3: 0000000027ee2000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Call Trace: <TASK> udp6_ufo_fragment+0xa0e/0xd00 net/ipv6/udp_offload.c:109 ipv6_gso_segment+0x534/0x17e0 net/ipv6/ip6_offload.c:120 skb_mac_gso_segment+0x290/0x610 net/core/gso.c:53 __skb_gso_segment+0x339/0x710 net/core/gso.c:124 skb_gso_segment include/net/gso.h:83 [inline] validate_xmit_skb+0x36c/0xeb0 net/core/dev.c:3626 __dev_queue_xmit+0x6f3/0x3d60 net/core/dev.c:4338 dev_queue_xmit include/linux/netdevice.h:3134 [inline] packet_xmit+0x257/0x380 net/packet/af_packet.c:276 packet_snd net/packet/af_packet.c:3087 [inline] packet_sendmsg+0x24c6/0x5220 net/packet/af_packet.c:3119 sock_sendmsg_nosec net/socket.c:730 [inline] __sock_sendmsg+0xd5/0x180 net/socket.c:745 __sys_sendto+0x255/0x340 net/socket.c:2190 __do_sys_sendto net/socket.c:2202 [inline] __se_sys_sendto net/socket.c:2198 [inline] __x64_sys_sendto+0xe0/0x1b0 net/socket.c:2198 do_syscall_x64 arch/x86/entry/common.c:52 [inline] do_syscall_64+0x40/0x110 arch/x86/entry/common.c:83 entry_SYSCALL_64_after_hwframe+0x63/0x6b RIP: 0033:0x7f8692032aa9 Code: 28 00 00 00 75 05 48 83 c4 28 c3 e8 d1 19 00 00 90 48 89 f8 48 89 f7 48 89 d6 48 89 ca 4d 89 c2 4d 89 c8 4c 8b 4c 24 08 0f 05 <48> 3d 01 f0 ff ff 73 01 c3 48 c7 c1 b8 ff ff ff f7 d8 64 89 01 48 RSP: 002b:00007fff8d685418 EFLAGS: 00000246 ORIG_RAX: 000000000000002c RAX: ffffffffffffffda RBX: 0000000000000003 RCX: 00007f8692032aa9 RDX: 0000000000010048 RSI: 00000000200000c0 RDI: 0000000000000003 RBP: 00000000000f4240 R08: 0000000020000540 R09: 0000000000000014 R10: 0000000000000000 R11: 0000000000000246 R12: 00007fff8d685480 R13: 0000000000000001 R14: 00007fff8d685480 R15: 0000000000000003 </TASK> Modules linked in: ---[ end trace 0000000000000000 ]--- RIP: 0010:skb_segment+0x181d/0x3f30 net/core/skbuff.c:4551 Code: 83 e3 02 e9 fb ed ff ff e8 90 68 1c f9 48 8b 84 24 f8 00 00 00 48 8d 78 70 48 b8 00 00 00 00 00 fc ff df 48 89 fa 48 c1 ea 03 <0f> b6 04 02 84 c0 74 08 3c 03 0f 8e 8a 21 00 00 48 8b 84 24 f8 00 RSP: 0018:ffffc900043473d0 EFLAGS: 00010202 RAX: dffffc0000000000 RBX: 0000000000010046 RCX: ffffffff886b1597 RDX: 000000000000000e RSI: ffffffff886b2520 RDI: 0000000000000070 RBP: ffffc90004347578 R08: 0000000000000005 R09: 000000000000ffff R10: 000000000000ffff R11: 0000000000000002 R12: ffff888063202ac0 R13: 0000000000010000 R14: 000000000000ffff R15: 0000000000000046 FS: 0000555556e7e380(0000) GS:ffff8880b9900000(0000) knlGS:0000000000000000 CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033 CR2: 0000000020010000 CR3: 0000000027ee2000 CR4: 00000000003506f0 DR0: 0000000000000000 DR1: 0000000000000000 DR2: 0000000000000000 DR3: 0000000000000000 DR6: 00000000fffe0ff0 DR7: 0000000000000400 Fixes: 3953c46c3ac7 ("sk_buff: allow segmenting based on frag sizes") Signed-off-by: Eric Dumazet <edumazet(a)google.com> Cc: Marcelo Ricardo Leitner <marcelo.leitner(a)gmail.com> Reviewed-by: Willem de Bruijn <willemb(a)google.com> Link: https://lore.kernel.org/r/20231212164621.4131800-1-edumazet@google.com Signed-off-by: Jakub Kicinski <kuba(a)kernel.org> Signed-off-by: Ziyang Xuan <william.xuanziyang(a)huawei.com> --- net/core/skbuff.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/net/core/skbuff.c b/net/core/skbuff.c index e03cd719b86b..c93662512d02 100644 --- a/net/core/skbuff.c +++ b/net/core/skbuff.c @@ -3625,8 +3625,9 @@ struct sk_buff *skb_segment(struct sk_buff *head_skb, /* GSO partial only requires that we trim off any excess that * doesn't fit into an MSS sized block, so take care of that * now. + * Cap len to not accidentally hit GSO_BY_FRAGS. */ - partial_segs = len / mss; + partial_segs = min(len, GSO_BY_FRAGS - 1) / mss; if (partial_segs > 1) mss *= partial_segs; else -- 2.25.1

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