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msrUDis69p8Eae1Iyb3T4zx+Jhn5iuDa5gAq+s51ut0Jsx5qJ8u4Xy/Df9QZT0Qx4CVSBAkWmr1Yv0PfwVq18YgZqWbJT6wREAOb3Ao8WU+Md1+n9Lgt0PWouWLqqsb640YfFciH5eHis3rNBbt6ygHXJ1XhYXASw2VU0mafCM9dtuwn1JOj9frSOfNM1payy/6yatIY3JstzUyFcaTmQ3YZSf62mJ4XrW0/5KZu4FW8rI4XfjQbTOWAvmsgCNqdH2Tbom47hphzcetf7h+IkeWgTBmaUOO/Tkct7uSfdMkWqXIr3WoIjaAi1N3ysc30M5AqWsc9wXZQwlC+512cAJHqKPHZb2aUawFjpFffBqC1tZClN4pDzC0O+slwxl8pMM1mzoQ/hiRMr35DaZUqe6bmo/81nb8HKHeHyBIFM4w= Content-ID: <94D74379531EE54985D3D9F0A9DB8386@eurprd08.prod.outlook.com> MIME-Version: 1.0 X-OriginatorOrg: arm.com X-MS-Exchange-CrossTenant-Network-Message-Id: 3cc99957-55da-4e20-7b60-08d6ac1abc5f X-MS-Exchange-CrossTenant-originalarrivaltime: 19 Mar 2019 03:26:55.1607 (UTC) X-MS-Exchange-CrossTenant-fromentityheader: Hosted X-MS-Exchange-CrossTenant-id: f34e5979-57d9-4aaa-ad4d-b122a662184d X-MS-Exchange-CrossTenant-mailboxtype: HOSTED X-MS-Exchange-Transport-CrossTenantHeadersStamped: AM4PR08MB2788 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190318_202703_821466_81E013B5 X-CRM114-Status: GOOD ( 20.37 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.21 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Steve Capper , Catalin Marinas , "jdike@addtoit.com" , Will Deacon , Oleg Nesterov , "Bin Lu \(Arm Technology China\)" , Richard Weinberger , Ingo Molnar , Paul Mackerras , Andy Lutomirski , Michael Ellerman , Thomas Gleixner Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 2019/3/18 18:49, Sudeep Holla wrote: > Add PTRACE_SYSEMU and PTRACE_SYSEMU_SINGLESTEP support on arm64. > We can just make sure of the generic ptrace_syscall_enter hook to > support PTRACE_SYSEMU. We don't need any special handling for > PTRACE_SYSEMU_SINGLESTEP. This looks good to me. But it'd be better to add the same logic to handle PTRACE_SYSEMU_SINGLESTEP as that of x86 in case we may need enable the single step trace function in the future. > > Cc: Catalin Marinas > Cc: Will Deacon > Signed-off-by: Sudeep Holla > --- > arch/arm64/include/asm/thread_info.h | 5 ++++- > arch/arm64/kernel/ptrace.c | 3 +++ > 2 files changed, 7 insertions(+), 1 deletion(-) > > diff --git a/arch/arm64/include/asm/thread_info.h b/arch/arm64/include/asm/thread_info.h > index eb3ef73e07cf..c285d1ce7186 100644 > --- a/arch/arm64/include/asm/thread_info.h > +++ b/arch/arm64/include/asm/thread_info.h > @@ -75,6 +75,7 @@ void arch_release_task_struct(struct task_struct *tsk); > * TIF_SYSCALL_TRACE- syscall trace active > * TIF_SYSCALL_TRACEPOINT - syscall tracepoint for ftrace > * TIF_SYSCALL_AUDIT- syscall auditing > + * TIF_SYSCALL_EMU - syscall emulation active > * TIF_SECOMP- syscall secure computing > * TIF_SIGPENDING- signal pending > * TIF_NEED_RESCHED- rescheduling necessary > @@ -91,6 +92,7 @@ void arch_release_task_struct(struct task_struct *tsk); > #define TIF_SYSCALL_AUDIT9 > #define TIF_SYSCALL_TRACEPOINT10 > #define TIF_SECCOMP11 > +#define TIF_SYSCALL_EMU12 > #define TIF_MEMDIE18/* is terminating due to OOM killer */ > #define TIF_FREEZE19 > #define TIF_RESTORE_SIGMASK20 > @@ -109,6 +111,7 @@ void arch_release_task_struct(struct task_struct *tsk); > #define _TIF_SYSCALL_AUDIT(1 << TIF_SYSCALL_AUDIT) > #define _TIF_SYSCALL_TRACEPOINT(1 << TIF_SYSCALL_TRACEPOINT) > #define _TIF_SECCOMP(1 << TIF_SECCOMP) > +#define _TIF_SYSCALL_EMU(1 << TIF_SYSCALL_EMU) > #define _TIF_UPROBE(1 << TIF_UPROBE) > #define _TIF_FSCHECK(1 << TIF_FSCHECK) > #define _TIF_32BIT(1 << TIF_32BIT) > @@ -120,7 +123,7 @@ void arch_release_task_struct(struct task_struct *tsk); > > #define _TIF_SYSCALL_WORK(_TIF_SYSCALL_TRACE | _TIF_SYSCALL_AUDIT | \ > _TIF_SYSCALL_TRACEPOINT | _TIF_SECCOMP | \ > - _TIF_NOHZ) > + _TIF_NOHZ | _TIF_SYSCALL_EMU) > > #define INIT_THREAD_INFO(tsk)\ > {\ > diff --git a/arch/arm64/kernel/ptrace.c b/arch/arm64/kernel/ptrace.c > index b82e0a9b3da3..cf29275cd4d9 100644 > --- a/arch/arm64/kernel/ptrace.c > +++ b/arch/arm64/kernel/ptrace.c > @@ -1819,6 +1819,9 @@ static void tracehook_report_syscall(struct pt_regs *regs, > > int syscall_trace_enter(struct pt_regs *regs) > { > +if (unlikely(ptrace_syscall_enter(regs))) > +return -1; > + > if (test_thread_flag(TIF_SYSCALL_TRACE)) > tracehook_report_syscall(regs, PTRACE_SYSCALL_ENTER); > > IMPORTANT NOTICE: The contents of this email and any attachments are confidential and may also be privileged. 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