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15b4155138
prctl(PR_SET_CFI,PR_CFI_BRANCH_LANDING_PADS) silently ignored
unknown control values. Only PR_CFI_{ENABLE,DISABLE,LOCK} should
be permitted.
This changes the behavior of the uABI (fails previously accepted bits
with EINVAL).
Fixes: 08ee155905 ("prctl: cfi: change the branch landing pad prctl()s to be more descriptive")
Signed-off-by: Richard Patel <ripatel@wii.dev>
Link: https://patch.msgid.link/20260518183918.322545-1-ripatel@wii.dev
[pjw@kernel.org: change the patch description to note that although this is a uABI change, it does not break the uABI]
Signed-off-by: Paul Walmsley <pjw@kernel.org>
99 lines
3.1 KiB
C
99 lines
3.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0
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* Copyright (C) 2024 Rivos, Inc.
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* Deepak Gupta <debug@rivosinc.com>
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*/
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#ifndef _ASM_RISCV_USERCFI_H
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#define _ASM_RISCV_USERCFI_H
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#define CMDLINE_DISABLE_RISCV_USERCFI_FCFI 1
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#define CMDLINE_DISABLE_RISCV_USERCFI_BCFI 2
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#define CMDLINE_DISABLE_RISCV_USERCFI 3
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#ifndef __ASSEMBLER__
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#include <linux/types.h>
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#include <linux/prctl.h>
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#include <linux/errno.h>
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struct task_struct;
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struct kernel_clone_args;
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extern unsigned long riscv_nousercfi;
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#ifdef CONFIG_RISCV_USER_CFI
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struct cfi_state {
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unsigned long ubcfi_en : 1; /* Enable for backward cfi. */
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unsigned long ubcfi_locked : 1;
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unsigned long ufcfi_en : 1; /* Enable for forward cfi. Note that ELP goes in sstatus */
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unsigned long ufcfi_locked : 1;
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unsigned long user_shdw_stk; /* Current user shadow stack pointer */
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unsigned long shdw_stk_base; /* Base address of shadow stack */
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unsigned long shdw_stk_size; /* size of shadow stack */
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};
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unsigned long shstk_alloc_thread_stack(struct task_struct *tsk,
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const struct kernel_clone_args *args);
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void shstk_release(struct task_struct *tsk);
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void set_shstk_base(struct task_struct *task, unsigned long shstk_addr, unsigned long size);
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unsigned long get_shstk_base(struct task_struct *task, unsigned long *size);
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void set_active_shstk(struct task_struct *task, unsigned long shstk_addr);
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bool is_shstk_enabled(struct task_struct *task);
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bool is_shstk_locked(struct task_struct *task);
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bool is_shstk_allocated(struct task_struct *task);
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void set_shstk_lock(struct task_struct *task, bool lock);
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void set_shstk_status(struct task_struct *task, bool enable);
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unsigned long get_active_shstk(struct task_struct *task);
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int restore_user_shstk(struct task_struct *tsk, unsigned long shstk_ptr);
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int save_user_shstk(struct task_struct *tsk, unsigned long *saved_shstk_ptr);
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bool is_indir_lp_enabled(struct task_struct *task);
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bool is_indir_lp_locked(struct task_struct *task);
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void set_indir_lp_status(struct task_struct *task, bool enable);
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void set_indir_lp_lock(struct task_struct *task, bool lock);
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#define PR_SHADOW_STACK_SUPPORTED_STATUS_MASK (PR_SHADOW_STACK_ENABLE)
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#define PR_CFI_SUPPORTED_STATUS_MASK (PR_CFI_ENABLE | PR_CFI_DISABLE | PR_CFI_LOCK)
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#else
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#define shstk_alloc_thread_stack(tsk, args) 0
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#define shstk_release(tsk)
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#define get_shstk_base(task, size) 0UL
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#define set_shstk_base(task, shstk_addr, size) do {} while (0)
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#define set_active_shstk(task, shstk_addr) do {} while (0)
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#define is_shstk_enabled(task) false
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#define is_shstk_locked(task) false
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#define is_shstk_allocated(task) false
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#define set_shstk_lock(task, lock) do {} while (0)
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#define set_shstk_status(task, enable) do {} while (0)
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#define is_indir_lp_enabled(task) false
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#define is_indir_lp_locked(task) false
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#define set_indir_lp_status(task, enable) do {} while (0)
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#define set_indir_lp_lock(task, lock) do {} while (0)
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#define restore_user_shstk(tsk, shstk_ptr) -EINVAL
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#define save_user_shstk(tsk, saved_shstk_ptr) -EINVAL
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#define get_active_shstk(task) 0UL
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#endif /* CONFIG_RISCV_USER_CFI */
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bool is_user_shstk_enabled(void);
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bool is_user_lpad_enabled(void);
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#endif /* __ASSEMBLER__ */
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#endif /* _ASM_RISCV_USERCFI_H */
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