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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 /scripts/basic/Makefile | |
| 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 'scripts/basic/Makefile')
| -rw-r--r-- | scripts/basic/Makefile | 21 |
1 files changed, 21 insertions, 0 deletions
diff --git a/scripts/basic/Makefile b/scripts/basic/Makefile new file mode 100644 index 000000000..fb8e2c38f --- /dev/null +++ b/scripts/basic/Makefile @@ -0,0 +1,21 @@ +# SPDX-License-Identifier: GPL-2.0-only +# +# fixdep: used to generate dependency information during build process + +hostprogs-always-y += fixdep + +# randstruct: the seed is needed before building the gcc-plugin or +# before running a Clang kernel build. +gen-randstruct-seed := $(srctree)/scripts/gen-randstruct-seed.sh +quiet_cmd_create_randstruct_seed = GENSEED $@ +cmd_create_randstruct_seed = \ + $(CONFIG_SHELL) $(gen-randstruct-seed) \ + $@ $(objtree)/include/generated/randstruct_hash.h +$(obj)/randstruct.seed: $(gen-randstruct-seed) FORCE + $(call if_changed,create_randstruct_seed) +always-$(CONFIG_RANDSTRUCT) += randstruct.seed + +# integer-wrap: if the .scl file changes, we need to do a full rebuild. +$(obj)/../../include/generated/integer-wrap.h: $(srctree)/scripts/integer-wrap-ignore.scl FORCE + $(call if_changed,touch) +always-$(CONFIG_UBSAN_INTEGER_WRAP) += ../../include/generated/integer-wrap.h |