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* x86/signal: delay calling signals on 32bitYang Shi2016-12-231-1/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | When running some ptrace single step tests on x86-32 machine, the below problem is triggered: BUG: sleeping function called from invalid context at kernel/locking/rtmutex.c:917 in_atomic(): 1, irqs_disabled(): 0, pid: 1041, name: dummy2 Preemption disabled at:[<c100326f>] do_debug+0x1f/0x1a0 CPU: 10 PID: 1041 Comm: dummy2 Tainted: G W 4.1.13-rt13 #1 Call Trace: [<c1aa8306>] dump_stack+0x46/0x5c [<c1080517>] ___might_sleep+0x137/0x220 [<c1ab0eff>] rt_spin_lock+0x1f/0x80 [<c1064b5a>] do_force_sig_info+0x2a/0xc0 [<c106567d>] force_sig_info+0xd/0x10 [<c1010cff>] send_sigtrap+0x6f/0x80 [<c10033b1>] do_debug+0x161/0x1a0 [<c1ab2921>] debug_stack_correct+0x2e/0x35 This happens since 959274753857 ("x86, traps: Track entry into and exit from IST context") which was merged in v4.1-rc1. Signed-off-by: Yang Shi <yang.shi@linaro.org> Signed-off-by: Sebastian Andrzej Siewior <bigeasy@linutronix.de>
* signal/x86: Delay calling signals in atomicOleg Nesterov2016-12-231-0/+13
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | On x86_64 we must disable preemption before we enable interrupts for stack faults, int3 and debugging, because the current task is using a per CPU debug stack defined by the IST. If we schedule out, another task can come in and use the same stack and cause the stack to be corrupted and crash the kernel on return. When CONFIG_PREEMPT_RT_FULL is enabled, spin_locks become mutexes, and one of these is the spin lock used in signal handling. Some of the debug code (int3) causes do_trap() to send a signal. This function calls a spin lock that has been converted to a mutex and has the possibility to sleep. If this happens, the above issues with the corrupted stack is possible. Instead of calling the signal right away, for PREEMPT_RT and x86_64, the signal information is stored on the stacks task_struct and TIF_NOTIFY_RESUME is set. Then on exit of the trap, the signal resume code will send the signal when preemption is enabled. [ rostedt: Switched from #ifdef CONFIG_PREEMPT_RT_FULL to ARCH_RT_DELAYS_SIGNAL_SEND and added comments to the code. ] Signed-off-by: Oleg Nesterov <oleg@redhat.com> Signed-off-by: Steven Rostedt <rostedt@goodmis.org> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86/signal: Add SA_{X32,IA32}_ABI sa_flagsDmitry Safonov2016-09-141-0/+4
| | | | | | | | | | | | | | | | | | | | | | | Introduce new flags that defines which ABI to use on creating sigframe. Those flags kernel will set according to sigaction syscall ABI, which set handler for the signal being delivered. So that will drop the dependency on TIF_IA32/TIF_X32 flags on signal deliver. Those flags will be used only under CONFIG_COMPAT. Similar way ARM uses sa_flags to differ in which mode deliver signal for 26-bit applications (look at SA_THIRYTWO). Signed-off-by: Dmitry Safonov <dsafonov@virtuozzo.com> Reviewed-by: Andy Lutomirski <luto@kernel.org> Cc: 0x7f454c46@gmail.com Cc: oleg@redhat.com Cc: linux-mm@kvack.org Cc: gorcunov@openvz.org Cc: xemul@virtuozzo.com Link: http://lkml.kernel.org/r/20160905133308.28234-7-dsafonov@virtuozzo.com Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
* x86, bitops: remove use of "sbb" to return CFH. Peter Anvin2016-06-081-3/+3
| | | | | | | | | | | | Use SETC instead of SBB to return the value of CF from assembly. Using SETcc enables uniformity with other flags-returning pieces of assembly code. Signed-off-by: H. Peter Anvin <hpa@zytor.com> Link: http://lkml.kernel.org/r/1465414726-197858-2-git-send-email-hpa@linux.intel.com Reviewed-by: Andy Lutomirski <luto@kernel.org> Reviewed-by: Borislav Petkov <bp@suse.de> Acked-by: Peter Zijlstra (Intel) <peterz@infradead.org>
* x86/headers: Remove <asm/sigcontext.h> references on the kernel sideIngo Molnar2015-09-081-1/+1
| | | | | | | | | | | | | | | | | | | | | | Now that all type definitions are in the UAPI header, include it directly, instead of through <asm/sigcontext.h>. [ We still keep asm/sigcontext.h, so that uapi/asm/sigcontext32.h can include <asm/sigcontext.h>. ] Acked-by: Mikko Rapeli <mikko.rapeli@iki.fi> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: linux-kernel@vger.kernel.org Link: http://lkml.kernel.org/r/1441438363-9999-16-git-send-email-mingo@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* x86/entry: Remove do_notify_resume(), syscall_trace_leave(), and their TIF masksAndy Lutomirski2015-08-051-1/+0
| | | | | | | | | | | | | | | | | | | They are no longer used. Good riddance! Deleting the TIF_ macros is really nice. It was never clear why there were so many variants. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Eric Paris <eparis@parisplace.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Link: http://lkml.kernel.org/r/22c61682f446628573dde0f1d573ab821677e06da.1438378274.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* x86/entry: Move C entry and exit code to arch/x86/entry/common.cAndy Lutomirski2015-07-071-0/+1
| | | | | | | | | | | | | | | | | | | | | | | | | | The entry and exit C helpers were confusingly scattered between ptrace.c and signal.c, even though they aren't specific to ptrace or signal handling. Move them together in a new file. This change just moves code around. It doesn't change anything. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Andy Lutomirski <luto@amacapital.net> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Denys Vlasenko <vda.linux@googlemail.com> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Kees Cook <keescook@chromium.org> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Rik van Riel <riel@redhat.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: paulmck@linux.vnet.ibm.com Link: http://lkml.kernel.org/r/324d686821266544d8572423cc281f961da445f4.1435952415.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
* signals: kill sigfindinword()Oleg Nesterov2014-06-061-6/+0
| | | | | | | | | | | | | | | | | | | It has no users and it doesn't look useful. I do not know why/when it was introduced, I can't even find any user in the git history. Signed-off-by: Oleg Nesterov <oleg@redhat.com> Acked-by: Geert Uytterhoeven <geert@linux-m68k.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Al Viro <viro@ZenIV.linux.org.uk> Cc: David Woodhouse <dwmw2@infradead.org> Cc: Frederic Weisbecker <fweisbec@gmail.com> Cc: Ingo Molnar <mingo@kernel.org> Cc: Mathieu Desnoyers <mathieu.desnoyers@efficios.com> Cc: Richard Weinberger <richard@nod.at> Cc: Steven Rostedt <rostedt@goodmis.org> Cc: Tejun Heo <tj@kernel.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
* x86: switch to generic old sigactionAl Viro2013-02-031-9/+0
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* consolidate kernel-side struct sigaction declarationsAl Viro2013-02-031-7/+3
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* consolidate declarations of k_sigactionAl Viro2013-02-031-5/+0
| | | | | | | Only alpha and sparc are unusual - they have ka_restorer in it. And nobody needs that exposed to userland. Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* UAPI: (Scripted) Disintegrate arch/x86/include/asmDavid Howells2012-12-141-139/+1
| | | | | | | | | Signed-off-by: David Howells <dhowells@redhat.com> Acked-by: Arnd Bergmann <arnd@arndb.de> Acked-by: Thomas Gleixner <tglx@linutronix.de> Acked-by: Michael Kerrisk <mtk.manpages@gmail.com> Acked-by: Paul E. McKenney <paulmck@linux.vnet.ibm.com> Acked-by: Dave Jones <davej@redhat.com>
* unify default ptrace_signal_deliverAl Viro2012-11-291-2/+0
| | | | Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
* x86, signal: Cleanup ifdefs and is_ia32, is_x32Suresh Siddha2012-09-181-0/+4
| | | | | | | | | | | | Use config_enabled() to cleanup the definitions of is_ia32/is_x32. Move the function prototypes to the header file to cleanup ifdefs, and move the x32_setup_rt_frame() code around. Signed-off-by: Suresh Siddha <suresh.b.siddha@intel.com> Link: http://lkml.kernel.org/r/1343171129-2747-2-git-send-email-suresh.b.siddha@intel.com Merged in compilation fix from, Link: http://lkml.kernel.org/r/1344544736.8326.17.camel@sbsiddha-desk.sc.intel.com Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
* asm-generic: rename termios.h, signal.h and mman.hArnd Bergmann2009-06-111-1/+1
| | | | | | | | | | The existing asm-generic versions are incomplete and included by some architectures. New architectures should be able to use a generic version, so rename the existing files and change all users, which lets us add the new files. Signed-off-by: Remis Lima Baima <remis.developer@googlemail.com> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
* x86: signal.c declare do_notify_resume before they get usedJaswinder Singh2008-12-161-2/+4
| | | | | | | | | | | | | Impact: cleanup In asm/signal.h moved out do_notify_resume from __i386__ as it is common for both 32 and 64 bit. Signed-off-by: Jaswinder Singh <jaswinder@infradead.org> Signed-off-by: Ingo Molnar <mingo@elte.hu> arch/x86/include/asm/signal.h | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-)
* x86: Fix ASM_X86__ header guardsH. Peter Anvin2008-10-221-3/+3
| | | | | | | | | Change header guards named "ASM_X86__*" to "_ASM_X86_*" since: a. the double underscore is ugly and pointless. b. no leading underscore violates namespace constraints. Signed-off-by: H. Peter Anvin <hpa@zytor.com>
* x86, um: ... and asm-x86 moveAl Viro2008-10-221-0/+262
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk> Signed-off-by: H. Peter Anvin <hpa@zytor.com>
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