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 --- tools/testing/shared/shared.mk | 79 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 79 insertions(+) create mode 100644 tools/testing/shared/shared.mk (limited to 'tools/testing/shared/shared.mk') diff --git a/tools/testing/shared/shared.mk b/tools/testing/shared/shared.mk new file mode 100644 index 000000000..5bcdf26c8 --- /dev/null +++ b/tools/testing/shared/shared.mk @@ -0,0 +1,79 @@ +# SPDX-License-Identifier: GPL-2.0 +include ../../scripts/Makefile.arch + +CFLAGS += -I../shared -I. -I../../include -I../../arch/$(SRCARCH)/include \ + -I../../../lib -g -Og -Wall \ + -D_LGPL_SOURCE -fsanitize=address -fsanitize=undefined +CFLAGS += $(EXTRA_CFLAGS) +LDFLAGS += -fsanitize=address -fsanitize=undefined +LDLIBS += -lpthread -lurcu +LIBS := slab.o find_bit.o bitmap.o hweight.o vsprintf.o +SHARED_OFILES = xarray-shared.o radix-tree.o idr.o linux.o $(LIBS) + +SHARED_DEPS = Makefile ../shared/shared.mk ../shared/*.h generated/map-shift.h \ + generated/bit-length.h generated/autoconf.h \ + ../../include/linux/*.h \ + ../../include/asm/*.h \ + ../../arch/$(SRCARCH)/include/asm/*.h \ + ../../../include/linux/xarray.h \ + ../../../include/linux/maple_tree.h \ + ../../../include/linux/radix-tree.h \ + ../../../lib/radix-tree.h \ + ../../../include/linux/idr.h \ + ../../../lib/maple_tree.c \ + ../../../lib/test_maple_tree.c + +ifndef SHIFT + SHIFT=3 +endif + +ifeq ($(BUILD), 32) + CFLAGS += -m32 + LDFLAGS += -m32 +LONG_BIT := 32 +endif + +ifndef LONG_BIT +LONG_BIT := $(shell getconf LONG_BIT) +endif + +%.o: ../shared/%.c + $(CC) -c $(CFLAGS) $< -o $@ + +vpath %.c ../../lib + +$(SHARED_OFILES): $(SHARED_DEPS) + +radix-tree.c: ../../../lib/radix-tree.c + sed -e 's/^static //' -e 's/__always_inline //' -e 's/inline //' < $< > $@ + +idr.c: ../../../lib/idr.c + sed -e 's/^static //' -e 's/__always_inline //' -e 's/inline //' < $< > $@ + +xarray-shared.o: ../shared/xarray-shared.c ../../../lib/xarray.c \ + ../../../lib/test_xarray.c + +maple-shared.o: ../shared/maple-shared.c ../../../lib/maple_tree.c \ + ../../../lib/test_maple_tree.c + +generated/autoconf.h: + @mkdir -p generated + cp ../shared/autoconf.h generated/autoconf.h + +generated/map-shift.h: + @mkdir -p generated + @if ! grep -qws $(SHIFT) generated/map-shift.h; then \ + echo "Generating $@"; \ + echo "#define XA_CHUNK_SHIFT $(SHIFT)" > \ + generated/map-shift.h; \ + fi + +generated/bit-length.h: FORCE + @mkdir -p generated + @if ! grep -qws CONFIG_$(LONG_BIT)BIT generated/bit-length.h; then \ + echo "Generating $@"; \ + echo "#define CONFIG_$(LONG_BIT)BIT 1" > $@; \ + echo "#define CONFIG_PHYS_ADDR_T_$(LONG_BIT)BIT 1" >> $@; \ + fi + +FORCE: ; -- cgit v1.3.1