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02aff8db64
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Merge tag 'audit-pr-20190507' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit
Pull audit updates from Paul Moore:
"We've got a reasonably broad set of audit patches for the v5.2 merge
window, the highlights are below:
- The biggest change, and the source of all the arch/* changes, is
the patchset from Dmitry to help enable some of the work he is
doing around PTRACE_GET_SYSCALL_INFO.
To be honest, including this in the audit tree is a bit of a
stretch, but it does help move audit a little further along towards
proper syscall auditing for all arches, and everyone else seemed to
agree that audit was a "good" spot for this to land (or maybe they
just didn't want to merge it? dunno.).
- We can now audit time/NTP adjustments.
- We continue the work to connect associated audit records into a
single event"
* tag 'audit-pr-20190507' of git://git.kernel.org/pub/scm/linux/kernel/git/pcmoore/audit: (21 commits)
audit: fix a memory leak bug
ntp: Audit NTP parameters adjustment
timekeeping: Audit clock adjustments
audit: purge unnecessary list_empty calls
audit: link integrity evm_write_xattrs record to syscall event
syscall_get_arch: add "struct task_struct *" argument
unicore32: define syscall_get_arch()
Move EM_UNICORE to uapi/linux/elf-em.h
nios2: define syscall_get_arch()
nds32: define syscall_get_arch()
Move EM_NDS32 to uapi/linux/elf-em.h
m68k: define syscall_get_arch()
hexagon: define syscall_get_arch()
Move EM_HEXAGON to uapi/linux/elf-em.h
h8300: define syscall_get_arch()
c6x: define syscall_get_arch()
arc: define syscall_get_arch()
Move EM_ARCOMPACT and EM_ARCV2 to uapi/linux/elf-em.h
audit: Make audit_log_cap and audit_copy_inode static
audit: connect LOGIN record to its syscall record
...
112 lines
2.8 KiB
C
112 lines
2.8 KiB
C
/*
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* Access to user system call parameters and results
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*
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* Copyright (C) 2008 Red Hat, Inc. All rights reserved.
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*
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* This copyrighted material is made available to anyone wishing to use,
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* modify, copy, or redistribute it subject to the terms and conditions
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* of the GNU General Public License v.2.
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*
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* See asm-generic/syscall.h for descriptions of what we must do here.
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*/
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#ifndef _ASM_SYSCALL_H
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#define _ASM_SYSCALL_H 1
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#include <uapi/linux/audit.h>
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#include <linux/sched.h>
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#include <linux/thread_info.h>
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/* ftrace syscalls requires exporting the sys_call_table */
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extern const unsigned long sys_call_table[];
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extern const unsigned long compat_sys_call_table[];
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static inline int syscall_get_nr(struct task_struct *task, struct pt_regs *regs)
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{
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/*
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* Note that we are returning an int here. That means 0xffffffff, ie.
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* 32-bit negative 1, will be interpreted as -1 on a 64-bit kernel.
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* This is important for seccomp so that compat tasks can set r0 = -1
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* to reject the syscall.
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*/
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return TRAP(regs) == 0xc00 ? regs->gpr[0] : -1;
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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->gpr[3] = regs->orig_gpr3;
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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->gpr[3];
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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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/*
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* In the general case it's not obvious that we must deal with CCR
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* here, as the syscall exit path will also do that for us. However
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* there are some places, eg. the signal code, which check ccr to
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* decide if the value in r3 is actually an error.
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*/
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if (error) {
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regs->ccr |= 0x10000000L;
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regs->gpr[3] = error;
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} else {
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regs->ccr &= ~0x10000000L;
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regs->gpr[3] = val;
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}
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}
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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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unsigned long val, mask = -1UL;
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unsigned int n = 6;
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#ifdef CONFIG_COMPAT
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if (test_tsk_thread_flag(task, TIF_32BIT))
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mask = 0xffffffff;
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#endif
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while (n--) {
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if (n == 0)
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val = regs->orig_gpr3;
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else
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val = regs->gpr[3 + n];
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args[n] = val & mask;
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}
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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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memcpy(®s->gpr[3], args, 6 * sizeof(args[0]));
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/* Also copy the first argument into orig_gpr3 */
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regs->orig_gpr3 = args[0];
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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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int arch;
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if (IS_ENABLED(CONFIG_PPC64) && !test_tsk_thread_flag(task, TIF_32BIT))
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arch = AUDIT_ARCH_PPC64;
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else
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arch = AUDIT_ARCH_PPC;
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#ifdef __LITTLE_ENDIAN__
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arch |= __AUDIT_ARCH_LE;
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#endif
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return arch;
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}
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#endif /* _ASM_SYSCALL_H */
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