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/ntfs/Kconfig | 48 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 48 insertions(+) create mode 100644 fs/ntfs/Kconfig (limited to 'fs/ntfs/Kconfig') diff --git a/fs/ntfs/Kconfig b/fs/ntfs/Kconfig new file mode 100644 index 000000000..6a6acde9b --- /dev/null +++ b/fs/ntfs/Kconfig @@ -0,0 +1,48 @@ +# SPDX-License-Identifier: GPL-2.0-only +config NTFS_FS + tristate "NTFS file system support" + select NLS + select FS_IOMAP + help + NTFS is the file system of Microsoft Windows NT, 2000, XP and 2003. + This allows you to mount devices formatted with the ntfs file system. + + To compile this as a module, choose M here: the module will be called + ntfs. + +config NTFS_DEBUG + bool "NTFS debugging support" + depends on NTFS_FS + help + If you are experiencing any problems with the NTFS file system, say + Y here. This will result in additional consistency checks to be + performed by the driver as well as additional debugging messages to + be written to the system log. Note that debugging messages are + disabled by default. To enable them, supply the option debug_msgs=1 + at the kernel command line when booting the kernel or as an option + to insmod when loading the ntfs module. Once the driver is active, + you can enable debugging messages by doing (as root): + echo 1 > /proc/sys/fs/ntfs-debug + Replacing the "1" with "0" would disable debug messages. + + If you leave debugging messages disabled, this results in little + overhead, but enabling debug messages results in very significant + slowdown of the system. + + When reporting bugs, please try to have available a full dump of + debugging messages while the misbehaviour was occurring. + +config NTFS_FS_POSIX_ACL + bool "NTFS POSIX Access Control Lists" + depends on NTFS_FS + select FS_POSIX_ACL + help + POSIX Access Control Lists (ACLs) support additional access rights + for users and groups beyond the standard owner/group/world scheme. + + This option enables ACL support for ntfs, providing functional parity + with ntfs3 drivier. + + NOTE: this is linux only feature. Windows will ignore these ACLs. + + If you don't know what Access Control Lists are, say N. -- cgit v1.3.1