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/arm/mach-omap1/clock.h | 195 ++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 195 insertions(+) create mode 100644 arch/arm/mach-omap1/clock.h (limited to 'arch/arm/mach-omap1/clock.h') diff --git a/arch/arm/mach-omap1/clock.h b/arch/arm/mach-omap1/clock.h new file mode 100644 index 000000000..16cfb2e86 --- /dev/null +++ b/arch/arm/mach-omap1/clock.h @@ -0,0 +1,195 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/* + * linux/arch/arm/mach-omap1/clock.h + * + * Copyright (C) 2004 - 2005, 2009 Nokia corporation + * Written by Tuukka Tikkanen + * Based on clocks.h by Tony Lindgren, Gordon McNutt and RidgeRun, Inc + */ + +#ifndef __ARCH_ARM_MACH_OMAP1_CLOCK_H +#define __ARCH_ARM_MACH_OMAP1_CLOCK_H + +#include +#include +#include + +struct module; +struct omap1_clk; + +struct omap_clk { + u16 cpu; + struct clk_lookup lk; +}; + +#define CLK(dev, con, ck, cp) \ + { \ + .cpu = cp, \ + .lk = { \ + .dev_id = dev, \ + .con_id = con, \ + .clk_hw = ck, \ + }, \ + } + +/* Platform flags for the clkdev-OMAP integration code */ +#define CK_310 (1 << 0) +#define CK_7XX (1 << 1) /* 7xx, 850 */ +#define CK_1510 (1 << 2) +#define CK_16XX (1 << 3) /* 16xx, 17xx, 5912 */ +#define CK_1710 (1 << 4) /* 1710 extra for rate selection */ + +/** + * struct clkops - some clock function pointers + * @enable: fn ptr that enables the current clock in hardware + * @disable: fn ptr that enables the current clock in hardware + * @allow_idle: fn ptr that enables autoidle for the current clock in hardware + */ +struct clkops { + int (*enable)(struct omap1_clk *clk); + void (*disable)(struct omap1_clk *clk); +}; + +/* + * struct clk.flags possibilities + * + * XXX document the rest of the clock flags here + */ +#define ENABLE_REG_32BIT (1 << 0) /* Use 32-bit access */ +#define CLOCK_IDLE_CONTROL (1 << 1) +#define CLOCK_NO_IDLE_PARENT (1 << 2) + +/** + * struct omap1_clk - OMAP1 struct clk + * @hw: struct clk_hw for common clock framework integration + * @ops: struct clkops * for this clock + * @rate: current clock rate + * @enable_reg: register to write to enable the clock (see @enable_bit) + * @recalc: fn ptr that returns the clock's current rate + * @set_rate: fn ptr that can change the clock's current rate + * @round_rate: fn ptr that can round the clock's current rate + * @init: fn ptr to do clock-specific initialization + * @enable_bit: bitshift to write to enable/disable the clock (see @enable_reg) + * @fixed_div: when > 0, this clock's rate is its parent's rate / @fixed_div + * @flags: see "struct clk.flags possibilities" above + * @rate_offset: bitshift for rate selection bitfield (OMAP1 only) + */ +struct omap1_clk { + struct clk_hw hw; + const struct clkops *ops; + unsigned long rate; + void __iomem *enable_reg; + unsigned long (*recalc)(struct omap1_clk *clk, unsigned long rate); + int (*set_rate)(struct omap1_clk *clk, unsigned long rate, + unsigned long p_rate); + long (*round_rate)(struct omap1_clk *clk, unsigned long rate, + unsigned long *p_rate); + int (*init)(struct omap1_clk *clk); + u8 enable_bit; + u8 fixed_div; + u8 flags; + u8 rate_offset; +}; +#define to_omap1_clk(_hw) container_of(_hw, struct omap1_clk, hw) + +void propagate_rate(struct omap1_clk *clk); +unsigned long followparent_recalc(struct omap1_clk *clk, unsigned long p_rate); +unsigned long omap_fixed_divisor_recalc(struct omap1_clk *clk, unsigned long p_rate); + +extern struct omap1_clk dummy_ck; + +int omap1_clk_init(void); +void omap1_clk_late_init(void); +unsigned long omap1_ckctl_recalc(struct omap1_clk *clk, unsigned long p_rate); +long omap1_round_sossi_rate(struct omap1_clk *clk, unsigned long rate, unsigned long *p_rate); +int omap1_set_sossi_rate(struct omap1_clk *clk, unsigned long rate, unsigned long p_rate); +unsigned long omap1_sossi_recalc(struct omap1_clk *clk, unsigned long p_rate); +unsigned long omap1_ckctl_recalc_dsp_domain(struct omap1_clk *clk, unsigned long p_rate); +int omap1_clk_set_rate_dsp_domain(struct omap1_clk *clk, unsigned long rate, + unsigned long p_rate); +long omap1_round_uart_rate(struct omap1_clk *clk, unsigned long rate, unsigned long *p_rate); +int omap1_set_uart_rate(struct omap1_clk *clk, unsigned long rate, unsigned long p_rate); +unsigned long omap1_uart_recalc(struct omap1_clk *clk, unsigned long p_rate); +int omap1_set_ext_clk_rate(struct omap1_clk *clk, unsigned long rate, unsigned long p_rate); +long omap1_round_ext_clk_rate(struct omap1_clk *clk, unsigned long rate, unsigned long *p_rate); +int omap1_init_ext_clk(struct omap1_clk *clk); +int omap1_select_table_rate(struct omap1_clk *clk, unsigned long rate, unsigned long p_rate); +long omap1_round_to_table_rate(struct omap1_clk *clk, unsigned long rate, unsigned long *p_rate); +int omap1_clk_set_rate_ckctl_arm(struct omap1_clk *clk, unsigned long rate, unsigned long p_rate); +long omap1_clk_round_rate_ckctl_arm(struct omap1_clk *clk, unsigned long rate, + unsigned long *p_rate); + +struct uart_clk { + struct omap1_clk clk; + unsigned long sysc_addr; +}; + +/* Provide a method for preventing idling some ARM IDLECT clocks */ +struct arm_idlect1_clk { + struct omap1_clk clk; + unsigned long no_idle_count; + __u8 idlect_shift; +}; + +/* ARM_CKCTL bit shifts */ +#define CKCTL_PERDIV_OFFSET 0 +#define CKCTL_LCDDIV_OFFSET 2 +#define CKCTL_ARMDIV_OFFSET 4 +#define CKCTL_DSPDIV_OFFSET 6 +#define CKCTL_TCDIV_OFFSET 8 +#define CKCTL_DSPMMUDIV_OFFSET 10 +/*#define ARM_TIMXO 12*/ +#define EN_DSPCK 13 +/*#define ARM_INTHCK_SEL 14*/ /* Divide-by-2 for mpu inth_ck */ +/* DSP_CKCTL bit shifts */ +#define CKCTL_DSPPERDIV_OFFSET 0 + +/* ARM_IDLECT2 bit shifts */ +#define EN_WDTCK 0 +#define EN_XORPCK 1 +#define EN_PERCK 2 +#define EN_LCDCK 3 +#define EN_LBCK 4 /* Not on 1610/1710 */ +/*#define EN_HSABCK 5*/ +#define EN_APICK 6 +#define EN_TIMCK 7 +#define DMACK_REQ 8 +#define EN_GPIOCK 9 /* Not on 1610/1710 */ +/*#define EN_LBFREECK 10*/ +#define EN_CKOUT_ARM 11 + +/* ARM_IDLECT3 bit shifts */ +#define EN_OCPI_CK 0 +#define EN_TC1_CK 2 +#define EN_TC2_CK 4 + +/* DSP_IDLECT2 bit shifts (0,1,2 are same as for ARM_IDLECT2) */ +#define EN_DSPTIMCK 5 + +/* Various register defines for clock controls scattered around OMAP chip */ +#define SDW_MCLK_INV_BIT 2 /* In ULPD_CLKC_CTRL */ +#define USB_MCLK_EN_BIT 4 /* In ULPD_CLKC_CTRL */ +#define USB_HOST_HHC_UHOST_EN 9 /* In MOD_CONF_CTRL_0 */ +#define SWD_ULPD_PLL_CLK_REQ 1 /* In SWD_CLK_DIV_CTRL_SEL */ +#define COM_ULPD_PLL_CLK_REQ 1 /* In COM_CLK_DIV_CTRL_SEL */ +#define SWD_CLK_DIV_CTRL_SEL 0xfffe0874 +#define COM_CLK_DIV_CTRL_SEL 0xfffe0878 +#define SOFT_REQ_REG 0xfffe0834 +#define SOFT_REQ_REG2 0xfffe0880 + +extern __u32 arm_idlect1_mask; +extern struct omap1_clk *api_ck_p, *ck_dpll1_p, *ck_ref_p; + +extern const struct clkops clkops_dspck; +extern const struct clkops clkops_uart_16xx; +extern const struct clkops clkops_generic; + +/* used for passing SoC type to omap1_{select,round_to}_table_rate() */ +extern u32 cpu_mask; + +extern const struct clk_ops omap1_clk_null_ops; +extern const struct clk_ops omap1_clk_gate_ops; +extern const struct clk_ops omap1_clk_rate_ops; +extern const struct clk_ops omap1_clk_full_ops; + +#endif -- cgit v1.3.1