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Syscall wrappers in <asm/syscall_wrapper.h> use const struct pt_regs * as the argument type. Use const in syscall_fn_t as well to fix indirect call type mismatches with Control-Flow Integrity checking. Signed-off-by: Sami Tolvanen <samitolvanen@google.com> Reviewed-by: Mark Rutland <mark.rutland@arm.com> Signed-off-by: Will Deacon <will.deacon@arm.com>
99 lines
2.4 KiB
C
99 lines
2.4 KiB
C
/*
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* Copyright (C) 2012 ARM Ltd.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License version 2 as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef __ASM_SYSCALL_H
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#define __ASM_SYSCALL_H
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#include <uapi/linux/audit.h>
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#include <linux/compat.h>
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#include <linux/err.h>
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typedef long (*syscall_fn_t)(const struct pt_regs *regs);
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extern const syscall_fn_t sys_call_table[];
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#ifdef CONFIG_COMPAT
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extern const syscall_fn_t compat_sys_call_table[];
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#endif
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static inline int syscall_get_nr(struct task_struct *task,
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struct pt_regs *regs)
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{
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return regs->syscallno;
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}
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static inline void syscall_rollback(struct task_struct *task,
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struct pt_regs *regs)
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{
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regs->regs[0] = regs->orig_x0;
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}
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static inline long syscall_get_error(struct task_struct *task,
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struct pt_regs *regs)
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{
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unsigned long error = regs->regs[0];
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return IS_ERR_VALUE(error) ? error : 0;
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}
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static inline long syscall_get_return_value(struct task_struct *task,
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struct pt_regs *regs)
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{
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return regs->regs[0];
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}
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static inline void syscall_set_return_value(struct task_struct *task,
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struct pt_regs *regs,
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int error, long val)
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{
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regs->regs[0] = (long) error ? error : val;
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}
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#define SYSCALL_MAX_ARGS 6
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static inline void syscall_get_arguments(struct task_struct *task,
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struct pt_regs *regs,
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unsigned long *args)
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{
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args[0] = regs->orig_x0;
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args++;
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memcpy(args, ®s->regs[1], 5 * sizeof(args[0]));
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}
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static inline void syscall_set_arguments(struct task_struct *task,
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struct pt_regs *regs,
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const unsigned long *args)
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{
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regs->orig_x0 = args[0];
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args++;
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memcpy(®s->regs[1], args, 5 * sizeof(args[0]));
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}
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/*
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* We don't care about endianness (__AUDIT_ARCH_LE bit) here because
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* AArch64 has the same system calls both on little- and big- endian.
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*/
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static inline int syscall_get_arch(struct task_struct *task)
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{
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if (is_compat_thread(task_thread_info(task)))
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return AUDIT_ARCH_ARM;
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return AUDIT_ARCH_AARCH64;
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}
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#endif /* __ASM_SYSCALL_H */
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