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Nicolin Chen 2280bb8577 iommu/dma: Force swiotlb_max_mapping_size on an untrusted device [ Upstream commit `afc5aa46ed` ] The swiotlb does not support a mapping size > swiotlb_max_mapping_size(). On the other hand, with a 64KB PAGE_SIZE configuration, it's observed that an NVME device can map a size between 300KB~512KB, which certainly failed the swiotlb mappings, though the default pool of swiotlb has many slots: systemd[1]: Started Journal Service. => nvme 0000:00:01.0: swiotlb buffer is full (sz: 327680 bytes), total 32768 (slots), used 32 (slots) note: journal-offline[392] exited with irqs disabled note: journal-offline[392] exited with preempt_count 1 Call trace: [ 3.099918] swiotlb_tbl_map_single+0x214/0x240 [ 3.099921] iommu_dma_map_page+0x218/0x328 [ 3.099928] dma_map_page_attrs+0x2e8/0x3a0 [ 3.101985] nvme_prep_rq.part.0+0x408/0x878 [nvme] [ 3.102308] nvme_queue_rqs+0xc0/0x300 [nvme] [ 3.102313] blk_mq_flush_plug_list.part.0+0x57c/0x600 [ 3.102321] blk_add_rq_to_plug+0x180/0x2a0 [ 3.102323] blk_mq_submit_bio+0x4c8/0x6b8 [ 3.103463] __submit_bio+0x44/0x220 [ 3.103468] submit_bio_noacct_nocheck+0x2b8/0x360 [ 3.103470] submit_bio_noacct+0x180/0x6c8 [ 3.103471] submit_bio+0x34/0x130 [ 3.103473] ext4_bio_write_folio+0x5a4/0x8c8 [ 3.104766] mpage_submit_folio+0xa0/0x100 [ 3.104769] mpage_map_and_submit_buffers+0x1a4/0x400 [ 3.104771] ext4_do_writepages+0x6a0/0xd78 [ 3.105615] ext4_writepages+0x80/0x118 [ 3.105616] do_writepages+0x90/0x1e8 [ 3.105619] filemap_fdatawrite_wbc+0x94/0xe0 [ 3.105622] __filemap_fdatawrite_range+0x68/0xb8 [ 3.106656] file_write_and_wait_range+0x84/0x120 [ 3.106658] ext4_sync_file+0x7c/0x4c0 [ 3.106660] vfs_fsync_range+0x3c/0xa8 [ 3.106663] do_fsync+0x44/0xc0 Since untrusted devices might go down the swiotlb pathway with dma-iommu, these devices should not map a size larger than swiotlb_max_mapping_size. To fix this bug, add iommu_dma_max_mapping_size() for untrusted devices to take into account swiotlb_max_mapping_size() v.s. iova_rcache_range() from the iommu_dma_opt_mapping_size(). Fixes: `82612d66d5` ("iommu: Allow the dma-iommu api to use bounce buffers") Link: https://lore.kernel.org/r/ee51a3a5c32cf885b18f6416171802669f4a718a.1707851466.git.nicolinc@nvidia.com Signed-off-by: Nicolin Chen <nicolinc@nvidia.com> [will: Drop redundant is_swiotlb_active(dev) check] Signed-off-by: Will Deacon <will@kernel.org> Reviewed-by: Michael Kelley <mhklinux@outlook.com> Acked-by: Robin Murphy <robin.murphy@arm.com> Tested-by: Nicolin Chen <nicolinc@nvidia.com> Tested-by: Michael Kelley <mhklinux@outlook.com> Signed-off-by: Christoph Hellwig <hch@lst.de> Signed-off-by: Sasha Levin <sashal@kernel.org>		2024-04-10 16:18:47 +02:00
arch	KVM: SVM: Flush pages under kvm->lock to fix UAF in svm_register_enc_region()	2024-04-10 16:18:45 +02:00
block	block: Clear zone limits for a non-zoned stacked queue	2024-04-10 16:18:35 +02:00
certs	certs/blacklist_hashes.c: fix const confusion in certs blacklist	2022-06-22 14:22:01 +02:00
crypto	crypto: api - Disallow identical driver names	2024-02-23 08:54:23 +01:00
Documentation	dma-mapping: add dma_opt_mapping_size()	2024-04-10 16:18:47 +02:00
drivers	iommu/dma: Force swiotlb_max_mapping_size on an untrusted device	2024-04-10 16:18:47 +02:00
fs	fs/aio: Check IOCB_AIO_RW before the struct aio_kiocb conversion	2024-04-10 16:18:46 +02:00
include	dma-iommu: add iommu_dma_opt_mapping_size()	2024-04-10 16:18:47 +02:00
init	modules: wait do_free_init correctly	2024-03-26 18:21:31 -04:00
io_uring	io_uring: don't save/restore iowait state	2024-03-26 18:21:35 -04:00
ipc	ipc/sem: Fix dangling sem_array access in semtimedop race	2022-12-08 11:28:45 +01:00
kernel	dma-mapping: add dma_opt_mapping_size()	2024-04-10 16:18:47 +02:00
lib	kasan/test: avoid gcc warning for intentional overflow	2024-04-10 16:18:35 +02:00
LICENSES
mm	memtest: use {READ,WRITE}_ONCE in memory scanning	2024-04-10 16:18:42 +02:00
net	xfrm: Avoid clang fortify warning in copy_to_user_tmpl()	2024-04-10 16:18:45 +02:00
samples	samples/hw_breakpoint: fix building without module unloading	2023-09-23 11:10:01 +02:00
scripts	kbuild: Move -Wenum-{compare-conditional,enum-conversion} into W=1	2024-04-10 16:18:41 +02:00
security	landlock: Warn once if a Landlock action is requested while disabled	2024-04-10 16:18:39 +02:00
sound	ALSA: hda/realtek - Fix headset Mic no show at resume back for Lenovo ALC897 platform	2024-04-10 16:18:45 +02:00
tools	selftests/mqueue: Set timeout to 180 seconds	2024-04-10 16:18:35 +02:00
usr	usr/include/Makefile: add linux/nfc.h to the compile-test coverage	2022-02-01 17:27:15 +01:00
virt	KVM: Always flush async #PF workqueue when vCPU is being destroyed	2024-04-10 16:18:34 +02:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap	mailmap: add Andrej Shadura	2021-10-18 20:22:03 -10:00
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS	iio: stx104: Move to addac subdirectory	2023-08-26 14:23:27 +02:00
Makefile	Linux 5.15.153	2024-03-26 18:23:03 -04:00
README

README

Linux kernel
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There are several guides for kernel developers and users. These guides can
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There are various text files in the Documentation/ subdirectory,
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