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 --- arch/m68k/sun3x/config.c | 76 ++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 76 insertions(+) create mode 100644 arch/m68k/sun3x/config.c (limited to 'arch/m68k/sun3x/config.c') diff --git a/arch/m68k/sun3x/config.c b/arch/m68k/sun3x/config.c new file mode 100644 index 000000000..798ea72a0 --- /dev/null +++ b/arch/m68k/sun3x/config.c @@ -0,0 +1,76 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * Setup kernel for a Sun3x machine + * + * (C) 1999 Thomas Bogendoerfer (tsbogend@alpha.franken.de) + * + * based on code from Oliver Jowett + */ + +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include + +#include "time.h" +#include "../sun3/sun3.h" + +volatile char *clock_va; + +void sun3_leds(unsigned char byte) +{ + +} + +static void sun3x_get_hardware_list(struct seq_file *m) +{ + seq_printf(m, "PROM Revision:\t%s\n", romvec->pv_monid); +} + +/* + * Setup the sun3x configuration info + */ +void __init config_sun3x(void) +{ + + sun3x_prom_init(); + + mach_sched_init = sun3x_sched_init; + mach_init_IRQ = sun3_init_IRQ; + + mach_reset = sun3x_reboot; + + mach_hwclk = sun3x_hwclk; + mach_get_model = sun3_get_model; + mach_get_hardware_list = sun3x_get_hardware_list; + + sun3_intreg = (unsigned char *)SUN3X_INTREG; + + /* only the serial console is known to work anyway... */ +#if 0 + switch (*(unsigned char *)SUN3X_EEPROM_CONS) { + case 0x10: + serial_console = 1; + conswitchp = NULL; + break; + case 0x11: + serial_console = 2; + conswitchp = NULL; + break; + default: + serial_console = 0; + break; + } +#endif + +} + -- cgit v1.3.1