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>

1 files changed, 72 insertions, 0 deletions

diff --git a/arch/powerpc/boot/ps3-head.S b/arch/powerpc/boot/ps3-head.S
new file mode 100644
index 000000000..0a4ebfcc3
--- /dev/null
+++ b/arch/powerpc/boot/ps3-head.S
@@ -0,0 +1,72 @@
+/* SPDX-License-Identifier: GPL-2.0-only */
+/*
+ *  PS3 bootwrapper entry.
+ *
+ *  Copyright (C) 2007 Sony Computer Entertainment Inc.
+ *  Copyright 2007 Sony Corp.
+ */
+
+#include "ppc_asm.h"
+
+	.machine "ppc64"
+
+	.text
+
+/*
+ * __system_reset_overlay - The PS3 first stage entry.
+ *
+ * The bootwraper build script copies the 512 bytes at symbol
+ * __system_reset_overlay to offset 0x100 of the rom image.  This symbol
+ * must occupy 512 or less bytes.
+ *
+ * The PS3 has a single processor with two threads.
+ */
+
+	.globl __system_reset_overlay
+__system_reset_overlay:
+
+	/* Switch to 32-bit mode. */
+
+	mfmsr	r9
+	clrldi	r9,r9,1
+	mtmsrd	r9
+	nop
+
+	/* Get thread number in r3 and branch. */
+
+	mfspr	r3, 0x88
+	cntlzw.	r3, r3
+	beq	1f
+
+	/* Secondary goes to __secondary_hold in kernel. */
+
+	li	r4, 0x60
+	mtctr	r4
+	bctr
+
+1:
+	/* Primary delays then goes to _zimage_start in wrapper. */
+
+	or	31, 31, 31 /* db16cyc */
+	or	31, 31, 31 /* db16cyc */
+
+	lis	r4, _zimage_start@ha
+	addi	r4, r4, _zimage_start@l
+	mtctr	r4
+	bctr
+
+	. = __system_reset_overlay + 512
+
+/*
+ * __system_reset_kernel - Place holder for the kernel reset vector.
+ *
+ * The bootwrapper build script copies 512 bytes from offset 0x100
+ * of the rom image to the symbol __system_reset_kernel.  At runtime
+ * the bootwrapper program copies the 512 bytes at __system_reset_kernel
+ * to ram address 0x100.  This symbol must occupy 512 bytes.
+ */
+
+	.globl __system_reset_kernel
+__system_reset_kernel:
+
+	. = __system_reset_kernel + 512