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/mips/sgi-ip22/ip22-setup.c | 77 +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 77 insertions(+) create mode 100644 arch/mips/sgi-ip22/ip22-setup.c (limited to 'arch/mips/sgi-ip22/ip22-setup.c') diff --git a/arch/mips/sgi-ip22/ip22-setup.c b/arch/mips/sgi-ip22/ip22-setup.c new file mode 100644 index 000000000..f083b25be --- /dev/null +++ b/arch/mips/sgi-ip22/ip22-setup.c @@ -0,0 +1,77 @@ +// SPDX-License-Identifier: GPL-2.0 +/* + * ip22-setup.c: SGI specific setup, including init of the feature struct. + * + * Copyright (C) 1996 David S. Miller (davem@davemloft.net) + * Copyright (C) 1997, 1998 Ralf Baechle (ralf@gnu.org) + */ +#include +#include +#include +#include +#include +#include +#include +#include + +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include +#include + +void __init plat_mem_setup(void) +{ + char *ctype; + char *cserial; + + board_be_init = ip22_be_init; + + /* Init the INDY HPC I/O controller. Need to call this before + * fucking with the memory controller because it needs to know the + * boardID and whether this is a Guiness or a FullHouse machine. + */ + sgihpc_init(); + + /* Init INDY memory controller. */ + sgimc_init(); + +#ifdef CONFIG_BOARD_SCACHE + /* Now enable boardcaches, if any. */ + indy_sc_init(); +#endif + + /* Set EISA IO port base for Indigo2 + * ioremap cannot fail */ + set_io_port_base((unsigned long)ioremap(0x00080000, + 0x1fffffff - 0x00080000)); + /* ARCS console environment variable is set to "g?" for + * graphics console, it is set to "d" for the first serial + * line and "d2" for the second serial line. + * + * Need to check if the case is 'g' but no keyboard: + * (ConsoleIn/Out = serial) + */ + ctype = ArcGetEnvironmentVariable("console"); + cserial = ArcGetEnvironmentVariable("ConsoleOut"); + + if ((ctype && *ctype == 'd') || (cserial && *cserial == 's')) { + static char options[8] __initdata; + char *baud = ArcGetEnvironmentVariable("dbaud"); + if (baud) + strscpy(options, baud); + add_preferred_console("ttyS", *(ctype + 1) == '2' ? 1 : 0, + baud ? options : NULL); + } else if (!ctype || *ctype != 'g') { + /* Use ARC if we don't want serial ('d') or graphics ('g'). */ + prom_flags |= PROM_FLAG_USE_AS_CONSOLE; + add_preferred_console("arc", 0, NULL); + } +} -- cgit v1.3.1