From 6668ed271eaefaa63e686bdfbedaeb7b8e492722 Mon Sep 17 00:00:00 2001 From: Kumar Kartikeya Dwivedi Date: Fri, 4 Sep 2026 10:43:19 +0200 Subject: selftests/bpf: Reject graph kptr use after RCU unlock Add a sleepable verifier test that loads a graph-node local kptr in an explicit RCU read-side critical section, then passes its node to bpf_rbtree_remove() after the section ends. Before the verifier fix, the stale NON_OWN_REF flag makes the node look like a live borrowed reference and the program is accepted. After the fix, the pointer is demoted without NON_OWN_REF and the graph kfunc argument is rejected. Also exercise a graph kptr loaded while a spin lock provides implicit RCU protection. The pointer must be invalidated when the lock is released, which guards the required ordering between non-owning-reference invalidation and RCU demotion. Update the existing fault-protected load test state description. The post-unlock pointer no longer carries NON_OWN_REF, but remains readable because the load is rewritten to use BPF_PROBE_MEM. Signed-off-by: Kumar Kartikeya Dwivedi Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com Signed-off-by: Alexei Starovoitov --- fs/quota/Kconfig | 70 ++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 70 insertions(+) create mode 100644 fs/quota/Kconfig (limited to 'fs/quota/Kconfig') diff --git a/fs/quota/Kconfig b/fs/quota/Kconfig new file mode 100644 index 000000000..818083a36 --- /dev/null +++ b/fs/quota/Kconfig @@ -0,0 +1,70 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# Quota configuration +# + +config QUOTA + bool "Quota support" + select QUOTACTL + help + If you say Y here, you will be able to set per user limits for disk + usage (also called disk quotas). Currently, it works for the + ext2, ext3, ext4, f2fs, jfs and ocfs2 file systems. Note that gfs2 + and xfs use their own quota system. Ext3 and ext4 also support + journaled quotas for which you don't need to run quotacheck(8) after + an unclean shutdown. For further details, read the Quota mini-HOWTO, + available from , or the + documentation provided with the quota tools. Probably the quota + support is only useful for multi user systems. If unsure, say N. + +config QUOTA_NETLINK_INTERFACE + bool "Report quota messages through netlink interface" + depends on QUOTACTL && NET + help + If you say Y here, quota warnings (about exceeding softlimit, reaching + hardlimit, etc.) will be reported through netlink interface. If unsure, + say Y. + +config PRINT_QUOTA_WARNING + bool "Print quota warnings to console (OBSOLETE)" + depends on QUOTA && BROKEN + default y + help + If you say Y here, quota warnings (about exceeding softlimit, reaching + hardlimit, etc.) will be printed to the process' controlling terminal. + Note that this behavior is currently deprecated and may go away in + future. Please use notification via netlink socket instead. + +config QUOTA_DEBUG + bool "Additional quota sanity checks" + depends on QUOTA + default n + help + If you say Y here, quota subsystem will perform some additional + sanity checks of quota internal structures. If unsure, say N. + +# Generic support for tree structured quota files. Selected when needed. +config QUOTA_TREE + tristate + +config QFMT_V1 + tristate "Old quota format support" + depends on QUOTA + help + This quota format was (is) used by kernels earlier than 2.4.22. If + you have quota working and you don't want to convert to new quota + format say Y here. + +config QFMT_V2 + tristate "Quota format vfsv0 and vfsv1 support" + depends on QUOTA + select QUOTA_TREE + help + This config option enables kernel support for vfsv0 and vfsv1 quota + formats. Both these formats support 32-bit UIDs/GIDs and vfsv1 format + also supports 64-bit inode and block quota limits. If you need this + functionality say Y here. + +config QUOTACTL + bool + default n -- cgit v1.3.1