From e873c74132f0c5f1452816cd9bb26208f0bba1e1 Mon Sep 17 00:00:00 2001 From: Shivank Garg Date: Sat, 22 Aug 2026 19:22:05 +0000 Subject: dmaengine: fix use-after-free in dma_chan_put() and dma_release_channel() When dma_device_put() drops the last reference on chan->device->ref, dma_device_release() runs and may free the dma_device along with its channels. dma_chan_put() then still reads chan->device->owner via dma_chan_to_owner() for the trailing module_put(). KASAN catches it: slab-use-after-free in dma_chan_put+0x3e6/0x4c0 Read of size 8 by task insmod/6319 Freed by task 6319: kfree+0x225/0x470 dma_chan_put+0x395/0x4c0 dmaengine_put+0xf8/0x160 Cache the module owner in dma_chan_put() before the put so the trailing module_put() does not need chan->device. Fixes: 8ad342a86359 ("dmaengine: Add reference counting to dma_device struct") Suggested-by: Sashiko Link: https://sashiko.dev/#/patchset/20260518-dmaengine-kref-fix-v1-1-4d6125048fb7@amd.com Reviewed-by: Frank Li Reviewed-by: Logan Gunthorpe Signed-off-by: Shivank Garg Link: https://patch.msgid.link/20260822-dmaengine-kref-fix-v5-3-d4a4ee47d927@amd.com Signed-off-by: Vinod Koul --- .../features/vm/ELF-ASLR/arch-support.txt | 31 ++++++++++++++++++++++ Documentation/features/vm/THP/arch-support.txt | 30 +++++++++++++++++++++ Documentation/features/vm/TLB/arch-support.txt | 30 +++++++++++++++++++++ .../features/vm/huge-vmap/arch-support.txt | 30 +++++++++++++++++++++ .../features/vm/ioremap_prot/arch-support.txt | 30 +++++++++++++++++++++ .../features/vm/pte_special/arch-support.txt | 30 +++++++++++++++++++++ 6 files changed, 181 insertions(+) create mode 100644 Documentation/features/vm/ELF-ASLR/arch-support.txt create mode 100644 Documentation/features/vm/THP/arch-support.txt create mode 100644 Documentation/features/vm/TLB/arch-support.txt create mode 100644 Documentation/features/vm/huge-vmap/arch-support.txt create mode 100644 Documentation/features/vm/ioremap_prot/arch-support.txt create mode 100644 Documentation/features/vm/pte_special/arch-support.txt (limited to 'Documentation/features/vm') diff --git a/Documentation/features/vm/ELF-ASLR/arch-support.txt b/Documentation/features/vm/ELF-ASLR/arch-support.txt new file mode 100644 index 000000000..57406c0d5 --- /dev/null +++ b/Documentation/features/vm/ELF-ASLR/arch-support.txt @@ -0,0 +1,31 @@ +# +# Feature name: ELF-ASLR +# Kconfig: ARCH_HAS_ELF_RANDOMIZE +# Kconfig: ARCH_WANT_DEFAULT_TOPDOWN_MMAP_LAYOUT +# description: arch randomizes the stack, heap and binary images of ELF binaries +# + ----------------------- + | arch |status| + ----------------------- + | alpha: | TODO | + | arc: | TODO | + | arm: | ok | + | arm64: | ok | + | csky: | ok | + | hexagon: | TODO | + | loongarch: | ok | + | m68k: | TODO | + | microblaze: | TODO | + | mips: | ok | + | nios2: | TODO | + | openrisc: | TODO | + | parisc: | ok | + | powerpc: | ok | + | riscv: | ok | + | s390: | ok | + | sh: | TODO | + | sparc: | TODO | + | um: | TODO | + | x86: | ok | + | xtensa: | TODO | + ----------------------- diff --git a/Documentation/features/vm/THP/arch-support.txt b/Documentation/features/vm/THP/arch-support.txt new file mode 100644 index 000000000..b4a5ce169 --- /dev/null +++ b/Documentation/features/vm/THP/arch-support.txt @@ -0,0 +1,30 @@ +# +# Feature name: THP +# Kconfig: HAVE_ARCH_TRANSPARENT_HUGEPAGE +# description: arch supports transparent hugepages +# + ----------------------- + | arch |status| + ----------------------- + | alpha: | TODO | + | arc: | ok | + | arm: | ok | + | arm64: | ok | + | csky: | .. | + | hexagon: | .. | + | loongarch: | ok | + | m68k: | .. | + | microblaze: | .. | + | mips: | ok | + | nios2: | .. | + | openrisc: | .. | + | parisc: | TODO | + | powerpc: | ok | + | riscv: | ok | + | s390: | ok | + | sh: | .. | + | sparc: | ok | + | um: | .. | + | x86: | ok | + | xtensa: | .. | + ----------------------- diff --git a/Documentation/features/vm/TLB/arch-support.txt b/Documentation/features/vm/TLB/arch-support.txt new file mode 100644 index 000000000..d222bd3ee --- /dev/null +++ b/Documentation/features/vm/TLB/arch-support.txt @@ -0,0 +1,30 @@ +# +# Feature name: batch-unmap-tlb-flush +# Kconfig: ARCH_WANT_BATCHED_UNMAP_TLB_FLUSH +# description: arch supports deferral of TLB flush until multiple pages are unmapped +# + ----------------------- + | arch |status| + ----------------------- + | alpha: | TODO | + | arc: | TODO | + | arm: | TODO | + | arm64: | ok | + | csky: | TODO | + | hexagon: | TODO | + | loongarch: | TODO | + | m68k: | .. | + | microblaze: | .. | + | mips: | TODO | + | nios2: | .. | + | openrisc: | .. | + | parisc: | TODO | + | powerpc: | TODO | + | riscv: | ok | + | s390: | TODO | + | sh: | TODO | + | sparc: | TODO | + | um: | .. | + | x86: | ok | + | xtensa: | TODO | + ----------------------- diff --git a/Documentation/features/vm/huge-vmap/arch-support.txt b/Documentation/features/vm/huge-vmap/arch-support.txt new file mode 100644 index 000000000..2d6de7b04 --- /dev/null +++ b/Documentation/features/vm/huge-vmap/arch-support.txt @@ -0,0 +1,30 @@ +# +# Feature name: huge-vmap +# Kconfig: HAVE_ARCH_HUGE_VMAP +# description: arch supports the arch_vmap_pud_supported() and arch_vmap_pmd_supported() VM APIs +# + ----------------------- + | arch |status| + ----------------------- + | alpha: | TODO | + | arc: | TODO | + | arm: | TODO | + | arm64: | ok | + | csky: | TODO | + | hexagon: | TODO | + | loongarch: | TODO | + | m68k: | TODO | + | microblaze: | TODO | + | mips: | TODO | + | nios2: | TODO | + | openrisc: | TODO | + | parisc: | TODO | + | powerpc: | ok | + | riscv: | ok | + | s390: | TODO | + | sh: | TODO | + | sparc: | TODO | + | um: | TODO | + | x86: | ok | + | xtensa: | TODO | + ----------------------- diff --git a/Documentation/features/vm/ioremap_prot/arch-support.txt b/Documentation/features/vm/ioremap_prot/arch-support.txt new file mode 100644 index 000000000..c0a2d8f56 --- /dev/null +++ b/Documentation/features/vm/ioremap_prot/arch-support.txt @@ -0,0 +1,30 @@ +# +# Feature name: ioremap_prot +# Kconfig: HAVE_IOREMAP_PROT +# description: arch has ioremap_prot() +# + ----------------------- + | arch |status| + ----------------------- + | alpha: | TODO | + | arc: | ok | + | arm: | TODO | + | arm64: | ok | + | csky: | TODO | + | hexagon: | TODO | + | loongarch: | ok | + | m68k: | TODO | + | microblaze: | TODO | + | mips: | ok | + | nios2: | TODO | + | openrisc: | TODO | + | parisc: | TODO | + | powerpc: | ok | + | riscv: | ok | + | s390: | ok | + | sh: | ok | + | sparc: | TODO | + | um: | TODO | + | x86: | ok | + | xtensa: | TODO | + ----------------------- diff --git a/Documentation/features/vm/pte_special/arch-support.txt b/Documentation/features/vm/pte_special/arch-support.txt new file mode 100644 index 000000000..3f777f8b6 --- /dev/null +++ b/Documentation/features/vm/pte_special/arch-support.txt @@ -0,0 +1,30 @@ +# +# Feature name: pte_special +# Kconfig: ARCH_HAS_PTE_SPECIAL +# description: arch supports the pte_special()/pte_mkspecial() VM APIs +# + ----------------------- + | arch |status| + ----------------------- + | alpha: | TODO | + | arc: | ok | + | arm: | ok | + | arm64: | ok | + | csky: | TODO | + | hexagon: | TODO | + | loongarch: | ok | + | m68k: | TODO | + | microblaze: | TODO | + | mips: | ok | + | nios2: | TODO | + | openrisc: | TODO | + | parisc: | ok | + | powerpc: | ok | + | riscv: | ok | + | s390: | ok | + | sh: | ok | + | sparc: | ok | + | um: | TODO | + | x86: | ok | + | xtensa: | TODO | + ----------------------- -- cgit v1.3.1