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Yonatan Nachum 43811d07ea RDMA/core: Fix ib block iterator counter overflow 
[ Upstream commit 0afec5e9ce ]

When registering a new DMA MR after selecting the best aligned page size
for it, we iterate over the given sglist to split each entry to smaller,
aligned to the selected page size, DMA blocks.

In given circumstances where the sg entry and page size fit certain
sizes and the sg entry is not aligned to the selected page size, the
total size of the aligned pages we need to cover the sg entry is >= 4GB.
Under this circumstances, while iterating page aligned blocks, the
counter responsible for counting how much we advanced from the start of
the sg entry is overflowed because its type is u32 and we pass 4GB in
size. This can lead to an infinite loop inside the iterator function
because the overflow prevents the counter to be larger
than the size of the sg entry.

Fix the presented problem by changing the advancement condition to
eliminate overflow.

Backtrace:
[  192.374329] efa_reg_user_mr_dmabuf
[  192.376783] efa_register_mr
[  192.382579] pgsz_bitmap 0xfffff000 rounddown 0x80000000
[  192.386423] pg_sz [0x80000000] umem_length[0xc0000000]
[  192.392657] start 0x0 length 0xc0000000 params.page_shift 31 params.page_num 3
[  192.399559] hp_cnt[3], pages_in_hp[524288]
[  192.403690] umem->sgt_append.sgt.nents[1]
[  192.407905] number entries: [1], pg_bit: [31]
[  192.411397] biter->__sg_nents [1] biter->__sg [0000000008b0c5d8]
[  192.415601] biter->__sg_advance [665837568] sg_dma_len[3221225472]
[  192.419823] biter->__sg_nents [1] biter->__sg [0000000008b0c5d8]
[  192.423976] biter->__sg_advance [2813321216] sg_dma_len[3221225472]
[  192.428243] biter->__sg_nents [1] biter->__sg [0000000008b0c5d8]
[  192.432397] biter->__sg_advance [665837568] sg_dma_len[3221225472]

Fixes: a808273a49 ("RDMA/verbs: Add a DMA iterator to return aligned contiguous memory blocks")
Signed-off-by: Yonatan Nachum <ynachum@amazon.com>
Link: https://lore.kernel.org/r/20230109133711.13678-1-ynachum@amazon.com
Signed-off-by: Leon Romanovsky <leon@kernel.org>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2023-02-01 08:34:07 +01:00
arch arm64: dts: marvell: AC5/AC5X: Fix address for UART1 2023-02-01 08:34:07 +01:00
block block: mq-deadline: Rename deadline_is_seq_writes() 2023-01-24 07:24:44 +01:00
certs certs: make system keyring depend on built-in x509 parser 2022-09-24 04:31:18 +09:00
crypto crypto: tcrypt - Fix multibuffer skcipher speed test mem leak 2022-12-31 13:32:34 +01:00
Documentation docs: Fix path paste-o for /sys/kernel/warn_count 2023-01-24 07:24:41 +01:00
drivers RDMA/core: Fix ib block iterator counter overflow 2023-02-01 08:34:07 +01:00
fs erofs: fix kvcalloc() misuse with __GFP_NOFAIL 2023-02-01 08:34:07 +01:00
include panic: Consolidate open-coded panic_on_warn checks 2023-01-24 07:24:41 +01:00
init gcc: disable -Warray-bounds for gcc-11 too 2023-01-14 10:33:43 +01:00
io_uring io_uring/poll: don't reissue in case of poll race on multishot request 2023-01-24 07:24:37 +01:00
ipc ipc: fix memory leak in init_mqueue_fs() 2022-12-31 13:32:01 +01:00
kernel exit: Use READ_ONCE() for all oops/warn limit reads 2023-01-24 07:24:41 +01:00
lib panic: Consolidate open-coded panic_on_warn checks 2023-01-24 07:24:41 +01:00
LICENSES LICENSES/LGPL-2.1: Add LGPL-2.1-or-later as valid identifiers 2021-12-16 14:33:10 +01:00
mm panic: Consolidate open-coded panic_on_warn checks 2023-01-24 07:24:41 +01:00
net Revert "wifi: mac80211: fix memory leak in ieee80211_if_add()" 2023-01-24 07:24:44 +01:00
rust Kbuild: add Rust support 2022-09-28 09:02:20 +02:00
samples samples: vfio-mdev: Fix missing pci_disable_device() in mdpy_fb_probe() 2022-12-31 13:32:42 +01:00
scripts - Handle different output of readelf on different distros running 2022-11-27 12:08:17 -08:00
security tomoyo: fix broken dependency on *.conf.default 2023-02-01 08:34:06 +01:00
sound ALSA: usb-audio: Fix possible NULL pointer dereference in snd_usb_pcm_has_fixed_rate() 2023-01-18 11:58:32 +01:00
tools selftests: mptcp: userspace: validate v4-v6 subflows mix 2023-01-24 07:24:37 +01:00
usr usr/gen_init_cpio.c: remove unnecessary -1 values from int file 2022-10-03 14:21:44 -07:00
virt Merge branch 'kvm-dwmw2-fixes' into HEAD 2022-11-23 18:59:45 -05:00
.clang-format inet: ping: use hlist_nulls rcu iterator during lookup 2022-12-01 12:42:46 +01:00
.cocciconfig scripts: add Linux .cocciconfig for coccinelle 2016-07-22 12:13:39 +02:00
.get_maintainer.ignore get_maintainer: add Alan to .get_maintainer.ignore 2022-08-20 15:17:44 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore Kbuild: add Rust support 2022-09-28 09:02:20 +02:00
.mailmap 9 hotfixes. 6 for MM, 3 for other areas. Four of these patches address 2022-12-10 17:10:52 -08:00
.rustfmt.toml rust: add .rustfmt.toml 2022-09-28 09:02:20 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: Remove Michal Marek from Kbuild maintainers 2022-11-16 14:53:00 +09:00
Kbuild Kbuild updates for v6.1 2022-10-10 12:00:45 -07:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS panic: Expose "warn_count" to sysfs 2023-01-24 07:24:41 +01:00
Makefile Linux 6.1.8 2023-01-24 07:24:44 +01:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.