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| author | Kumar Kartikeya Dwivedi <memxor@gmail.com> | 2026-09-04 10:43:19 +0200 |
|---|---|---|
| committer | Alexei Starovoitov <ast@kernel.org> | 2026-09-04 07:58:36 -0700 |
| commit | 6668ed271eaefaa63e686bdfbedaeb7b8e492722 (patch) | |
| tree | 58e8288fead484f6755ad0815fc74c3742663761 /arch/x86/Kbuild | |
| download | linux-stable-6668ed271eaefaa63e686bdfbedaeb7b8e492722.tar.gz linux-stable-6668ed271eaefaa63e686bdfbedaeb7b8e492722.zip | |
selftests/bpf: Reject graph kptr use after RCU unlockgrafted
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 <memxor@gmail.com>
Link: https://lore.kernel.org/r/20260904084325.52250-7-memxor@gmail.com
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
Diffstat (limited to 'arch/x86/Kbuild')
| -rw-r--r-- | arch/x86/Kbuild | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/arch/x86/Kbuild b/arch/x86/Kbuild new file mode 100644 index 000000000..36b985d0e --- /dev/null +++ b/arch/x86/Kbuild @@ -0,0 +1,40 @@ +# SPDX-License-Identifier: GPL-2.0 + +# Branch profiling isn't noinstr-safe. Disable it for arch/x86/* +subdir-ccflags-$(CONFIG_TRACE_BRANCH_PROFILING) += -DDISABLE_BRANCH_PROFILING + +obj-y += boot/startup/ + +obj-$(CONFIG_ARCH_HAS_CC_PLATFORM) += coco/ + +obj-y += entry/ + +obj-$(CONFIG_PERF_EVENTS) += events/ + +obj-$(CONFIG_KVM) += kvm/ + +# Xen paravirtualization support +obj-$(CONFIG_XEN) += xen/ + +obj-$(CONFIG_PVH) += platform/pvh/ + +# Hyper-V paravirtualization support +obj-$(subst m,y,$(CONFIG_HYPERV)) += hyperv/ + +obj-y += realmode/ +obj-y += kernel/ +obj-y += mm/ + +obj-y += crypto/ + +obj-$(CONFIG_IA32_EMULATION) += ia32/ + +obj-y += platform/ +obj-y += net/ + +obj-$(CONFIG_KEXEC_FILE) += purgatory/ + +obj-y += virt/ + +# for cleaning +subdir- += boot tools |