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arm64: rseq: Implement backend rseq calls and select HAVE_RSEQ

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Implement calls to rseq_signal_deliver, rseq_handle_notify_resume
and rseq_syscall so that we can select HAVE_RSEQ on arm64.

Acked-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Acked-by: Mark Rutland <mark.rutland@arm.com>
Signed-off-by: Will Deacon <will.deacon@arm.com>
This commit is contained in:
Will Deacon 2018-06-20 14:46:50 +01:00
parent 54501ac150
commit 409d5db498
6 changed files with 11 additions and 1 deletions
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1
arch/arm64/Kconfig
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@ -138,6 +138,7 @@ config ARM64
select HAVE_PERF_USER_STACK_DUMP
select HAVE_REGS_AND_STACK_ACCESS_API
select HAVE_RCU_TABLE_FREE
select HAVE_RSEQ
select HAVE_STACKPROTECTOR
select HAVE_SYSCALL_TRACEPOINTS
select HAVE_KPROBES

2
arch/arm64/include/asm/unistd.h
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@ -43,7 +43,7 @@
#define __ARM_NR_compat_cacheflush (__ARM_NR_COMPAT_BASE+2)
#define __ARM_NR_compat_set_tls (__ARM_NR_COMPAT_BASE+5)
#define __NR_compat_syscalls 398
#define __NR_compat_syscalls 399
#endif
#define __ARCH_WANT_SYS_CLONE

2
arch/arm64/include/asm/unistd32.h
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@ -817,6 +817,8 @@ __SYSCALL(__NR_pkey_alloc, sys_pkey_alloc)
__SYSCALL(__NR_pkey_free, sys_pkey_free)
#define __NR_statx 397
__SYSCALL(__NR_statx, sys_statx)
#define __NR_rseq 398
__SYSCALL(__NR_rseq, sys_rseq)
/*
* Please add new compat syscalls above this comment and update

2
arch/arm64/kernel/entry.S
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@ -904,6 +904,7 @@ ENDPROC(el0_error)
ret_fast_syscall:
disable_daif
str x0, [sp, #S_X0] // returned x0
#ifndef CONFIG_DEBUG_RSEQ
ldr x1, [tsk, #TSK_TI_FLAGS] // re-check for syscall tracing
and x2, x1, #_TIF_SYSCALL_WORK
cbnz x2, ret_fast_syscall_trace
@ -911,6 +912,7 @@ ret_fast_syscall:
cbnz x2, work_pending
enable_step_tsk x1, x2
kernel_exit 0
#endif
ret_fast_syscall_trace:
enable_daif
b __sys_trace_return_skipped // we already saved x0

2
arch/arm64/kernel/ptrace.c
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@ -1658,6 +1658,8 @@ asmlinkage void syscall_trace_exit(struct pt_regs *regs)
if (test_thread_flag(TIF_SYSCALL_TRACE))
tracehook_report_syscall(regs, PTRACE_SYSCALL_EXIT);
rseq_syscall(regs);
}
/*

3
arch/arm64/kernel/signal.c
View File

@ -802,6 +802,8 @@ static void handle_signal(struct ksignal *ksig, struct pt_regs *regs)
int usig = ksig->sig;
int ret;
rseq_signal_deliver(ksig, regs);
/*
* Set up the stack frame
*/
@ -940,6 +942,7 @@ asmlinkage void do_notify_resume(struct pt_regs *regs,
if (thread_flags & _TIF_NOTIFY_RESUME) {
clear_thread_flag(TIF_NOTIFY_RESUME);
tracehook_notify_resume(regs);
rseq_handle_notify_resume(NULL, regs);
}
if (thread_flags & _TIF_FOREIGN_FPSTATE)