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Filename Latest commit message Latest commit date
Eric Dumazet 93f54354cc fq_codel: reject silly quantum parameters
[ Upstream commit c7c5e6ff533fe1f9afef7d2fa46678987a1335a7 ]

syzbot found that forcing a big quantum attribute would crash hosts fast,
essentially using this:

tc qd replace dev eth0 root fq_codel quantum 4294967295

This is because fq_codel_dequeue() would have to loop
~2^31 times in :

	if (flow->deficit <= 0) {
		flow->deficit += q->quantum;
		list_move_tail(&flow->flowchain, &q->old_flows);
		goto begin;
	}

SFQ max quantum is 2^19 (half a megabyte)
Lets adopt a max quantum of one megabyte for FQ_CODEL.

Fixes: 4b549a2ef4 ("fq_codel: Fair Queue Codel AQM")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Signed-off-by: Sasha Levin <sashal@kernel.org>
2021-09-22 12:26:45 +02:00
arch ARC: export clear_user_page() for modules 2021-09-22 12:26:45 +02:00
block block, bfq: honor already-setup queue merges 2021-09-22 12:26:44 +02:00
certs certs: Trigger creation of RSA module signing key if it's not an RSA key 2021-09-15 09:47:29 +02:00
crypto crypto: shash - avoid comparing pointers to exported functions under CFI 2021-07-14 16:53:13 +02:00
Documentation dt-bindings: mtd: gpmc: Fix the ECC bytes vs. OOB bytes equation 2021-09-22 12:26:43 +02:00
drivers net: dsa: b53: Fix calculating number of switch ports 2021-09-22 12:26:45 +02:00
fs fuse: fix use after free in fuse_read_interrupt() 2021-09-22 12:26:43 +02:00
include fq_codel: reject silly quantum parameters 2021-09-22 12:26:45 +02:00
init kbuild: add CONFIG_LD_IS_LLD 2021-06-30 08:47:44 -04:00
ipc
kernel tracing/probes: Reject events which have the same name of existing one 2021-09-22 12:26:43 +02:00
lib lib/test_stackinit: Fix static initializer test 2021-09-22 12:26:38 +02:00
LICENSES
mm mm/memory_hotplug: use "unsigned long" for PFN in zone_for_pfn_range() 2021-09-22 12:26:43 +02:00
net fq_codel: reject silly quantum parameters 2021-09-22 12:26:45 +02:00
samples samples: bpf: Fix tracex7 error raised on the missing argument 2021-09-22 12:26:30 +02:00
scripts kbuild: Fix 'no symbols' warning when CONFIG_TRIM_UNUSD_KSYMS=y 2021-09-22 12:26:26 +02:00
security Smack: Fix wrong semantics in smk_access_entry() 2021-09-22 12:26:27 +02:00
sound ASoC: rockchip: i2s: Fixup config for DAIFMT_DSP_A/B 2021-09-22 12:26:35 +02:00
tools perf unwind: Do not overwrite FEATURE_CHECK_LDFLAGS-libunwind-{x86,aarch64} 2021-09-22 12:26:45 +02:00
usr
virt KVM: arm64: Handle PSCI resets before userspace touches vCPU state 2021-09-22 12:26:45 +02:00
.clang-format
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.get_maintainer.ignore
.gitattributes
.gitignore
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COPYING
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Kconfig
MAINTAINERS
Makefile Linux 5.4.147 2021-09-16 12:56:14 +02:00
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
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    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.