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* signal/arc: Use force_sig_fault where appropriateEric W. Biederman2018-09-271-15/+5
| | | | | Acked-by: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/arc: Push siginfo generation into unhandled_exceptionEric W. Biederman2018-09-271-14/+8
| | | | | | | | | | | Pass signr, sicode, and address into unhandled_exception as explicit parameters instead of members of struct siginfo. Then in unhandled exception generate and send the siginfo using force_sig_fault. This keeps the code simpler and less error prone. Acked-by: Vineet Gupta <vgupta@synopsys.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/ia64: Use force_sig_fault where appropriateEric W. Biederman2018-09-274-150/+49
| | | | | Acked-by: Tony Luck <tony.luck@intel.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/ia64: Use the force_sig(SIGSEGV,...) in ia64_rt_sigreturnEric W. Biederman2018-09-271-9/+1
| | | | | | | | | | | | | | | | | | | | | | The ia64 handling of failure to return from a signal frame has been trying to set overlapping fields in struct siginfo since 2.3.43. The si_code corresponds to the fields that were stomped (not the field that is actually written), so I can not imagine a piece of userspace code making sense of the signal frame if it looks closely. In practice failure to return from a signal frame is a rare event that almost never happens. Someone using an alternate signal stack to recover and looking in detail is even more rare. So I presume no one has ever noticed and reported this ia64 nonsense. Sort this out by causing ia64 to use force_sig(SIGSEGV) like other architectures. Fixes: 2.3.43 Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: linux-ia64@vger.kernel.org Acked-by: Tony Luck <tony.luck@intel.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/ia64: Use the generic force_sigsegv in setup_frameEric W. Biederman2018-09-271-38/+12
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | The ia64 handling of failure to setup a signal frame has been trying to set overlapping fields in struct siginfo since 2.3.43. The si_pid and si_uid fields are stomped when the si_addr field is set. The si_code of SI_KERNEL indicates that si_pid and si_uid should be valid, and that si_addr does not exist. Being at odds with the definition of SI_KERNEL and with nothing to indicate that this was a signal frame setup failure there is no way for userspace to know that si_addr was filled out instead. In practice failure to setup a signal frame is rare, and si_pid and si_uid are always set to 0 when si_code is SI_KERNEL so I expect no one has looked closely enough before to see this weirdness. Further the only difference between force_sigsegv_info and the generic force_sigsegv other than the return code is that force_sigsegv_info stomps the si_uid and si_pid fields. Remove the bug and simplify the code by using force_sigsegv in this case just like other architectures. Fixes: 2.3.43 Cc: Tony Luck <tony.luck@intel.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: linux-ia64@vger.kernel.org Acked-by: Tony Luck <tony.luck@intel.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/arm: Use send_sig_fault where appropriateEric W. Biederman2018-09-271-8/+3
| | | | Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/arm: Use force_sig_fault where appropriateEric W. Biederman2018-09-273-27/+4
| | | | Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/arm: Push siginfo generation into arm_notify_dieEric W. Biederman2018-09-274-71/+30
| | | | | | | | | | In arm_notify_die call force_sig_fault to let the generic code handle siginfo generation. This removes some boiler plate making the code easier to maintain in the long run. Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/arm64: Use send_sig_fault where appropriateEric W. Biederman2018-09-271-7/+3
| | | | | | Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/arm64: Add and use arm64_force_sig_ptrace_errno_trapEric W. Biederman2018-09-273-1/+11
| | | | | | | | | | | | Add arm64_force_sig_ptrace_errno_trap for consistency with arm64_force_sig_fault and use it where appropriate. This adds the show_signal logic to the force_sig_errno_trap case, where it was apparently overlooked earlier. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/arm64: In ptrace_hbptriggered name the signal description stringEric W. Biederman2018-09-271-1/+2
| | | | | | | | This will let the description be reused shortly. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/arm64: Remove arm64_force_sig_infoEric W. Biederman2018-09-272-7/+0
| | | | | | | | The function has no more callers so remove it. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/arm64: Add and use arm64_force_sig_mceerr as appropriateEric W. Biederman2018-09-273-7/+10
| | | | | | | | | | | | Add arm64_force_sig_mceerr for consistency with arm64_force_sig_fault, and use it in the one location that can take advantage of it. This removes the fiddly filling out of siginfo before sending a signal reporting an memory error to userspace. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/arm64: Add and use arm64_force_sig_fault where appropriateEric W. Biederman2018-09-275-51/+25
| | | | | | | | | Wrap force_sig_fault with a helper that calls arm64_show_signal and call arm64_force_sig_fault where appropraite. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
* signal/arm64: Only call set_thread_esr once in do_page_faultEric W. Biederman2018-09-271-3/+1
| | | | | | | | This code is truly common between the signal sending cases so share it. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
* signal/arm64: Only perform one esr_to_fault_info call in do_page_faultEric W. Biederman2018-09-271-3/+5
| | | | | | | | | As this work is truly common between all of the signal sending cases there is no need to repeat it between the different cases. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: Eric W. Biederman <ebiederm@xmission.com>
* signal/arm64: Expand __do_user_fault and remove itEric W. Biederman2018-09-271-10/+8
| | | | | | | | | | Not all of the signals passed to __do_user_fault can be handled the same way so expand the now tiny __do_user_fault in it's callers and remove it. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/arm64: For clarity separate the 3 signal sending cases in do_page_faultEric W. Biederman2018-09-271-4/+9
| | | | | | | | | | It gets easy to confuse what is going on when some code is shared and some not so stop sharing the trivial bits of signal generation to make future updates easier to understand. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/arm64: Consolidate the two hwpoison cases in do_page_faultEric W. Biederman2018-09-271-7/+7
| | | | | | | | | | These two cases are practically the same and use siginfo differently from the other signals sent from do_page_fault. So consolidate them to make future changes easier. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/arm64: Factor set_thread_esr out of __do_user_faultEric W. Biederman2018-09-271-2/+7
| | | | | | | | | This pepares for sending signals with something other than arm64_force_sig_info. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/arm64: Factor out arm64_show_signal from arm64_force_sig_infoEric W. Biederman2018-09-271-13/+11
| | | | | | | | | | | | Filling in siginfo is error prone and so it is wise to use more specialized helpers to do that work. Factor out the arm specific unhandled signal reporting from the work of delivering a signal so the code can be modified to use functions that take the information to fill out siginfo as parameters. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/arm64: Remove unneeded tsk parameter from arm64_force_sig_infoEric W. Biederman2018-09-275-9/+8
| | | | | | | | | Every caller passes in current for tsk so there is no need to pass tsk. Instead make tsk a local variable initialized to current. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/arm64: Push siginfo generation into arm64_notify_dieEric W. Biederman2018-09-274-51/+30
| | | | | | | | | | | | | | | | | | | | Instead of generating a struct siginfo before calling arm64_notify_die pass the signal number, tne sicode and the fault address into arm64_notify_die and have it call force_sig_fault instead of force_sig_info to let the generic code generate the struct siginfo. This keeps code passing just the needed information into siginfo generating code, making it easier to see what is happening and harder to get wrong. Further by letting the generic code handle the generation of struct siginfo it reduces the number of sites generating struct siginfo making it possible to review them and verify that all of the fiddly details for a structure passed to userspace are handled properly. Reviewed-by: Catalin Marinas <catalin.marinas@arm.com> Tested-by: Catalin Marinas <catalin.marinas@arm.com> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/powerpc: Use force_sig_fault where appropriateEric W. Biederman2018-09-214-36/+12
| | | | | Reviewed-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/powerpc: Simplify _exception_pkey by using force_sig_pkuerrEric W. Biederman2018-09-211-9/+1
| | | | | | | | Call force_sig_pkuerr directly instead of rolling it by hand in _exception_pkey. Reviewed-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/powerpc: Specialize _exception_pkey for handling pkey exceptionsEric W. Biederman2018-09-213-7/+7
| | | | | | | | | | Now that _exception no longer calls _exception_pkey it is no longer necessary to handle any signal with any si_code. All pkey exceptions are SIGSEGV with paired with SEGV_PKUERR. So just handle that case and remove the now unnecessary parameters from _exception_pkey. Reviewed-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/powerpc: Call force_sig_fault from _exceptionEric W. Biederman2018-09-211-1/+4
| | | | | | | | | | The callers of _exception don't need the pkey exception logic because they are not processing a pkey exception. So just call exception_common directly and then call force_sig_fault to generate the appropriate siginfo and deliver the appropriate signal. Reviewed-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/powerpc: Factor the common exception code into exception_commonEric W. Biederman2018-09-211-5/+13
| | | | | | | | | | | | | It is brittle and wrong to populate si_pkey when there was not a pkey exception. The field does not exist for all si_codes and in some cases another field exists in the same memory location. So factor out the code that all exceptions handlers must run into exception_common, leaving the individual exception handlers to generate the signals themselves. Reviewed-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/powerpc: Remove pkey parameter from __bad_area_nosemaphoreEric W. Biederman2018-09-211-5/+4
| | | | | | | | Now that bad_key_fault_exception no longer calls __bad_area_nosemaphore there is no reason for __bad_area_nosemaphore to handle pkeys. Reviewed-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/powerpc: Call _exception_pkey directly from bad_key_fault_exceptionEric W. Biederman2018-09-211-1/+11
| | | | | | | This removes the need for other code paths to deal with pkey exceptions. Reviewed-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/powerpc: Remove pkey parameter from __bad_areaEric W. Biederman2018-09-211-5/+4
| | | | | | | | There are no callers of __bad_area that pass in a pkey parameter so it makes no sense to take one. Reviewed-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/powerpc: Use force_sig_mceerr as appropriateEric W. Biederman2018-09-211-7/+11
| | | | | | | | | In do_sigbus isolate the mceerr signaling code and call force_sig_mceerr instead of falling through to the force_sig_info that works for all of the other signals. Reviewed-by: Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/x86: Use force_sig_fault where appropriateEric W. Biederman2018-09-214-32/+9
| | | | | Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/x86: Pass pkey by valueEric W. Biederman2018-09-211-7/+7
| | | | | | | | | Now that si_code == SEGV_PKUERR is the flag indicating that a pkey is present there is no longer a need to pass a pointer to a local pkey value, instead pkey can be passed more efficiently by value. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/x86: Replace force_sig_info_fault with force_sig_faultEric W. Biederman2018-09-211-19/+4
| | | | | | | | | | Now that the pkey handling has been removed force_sig_info_fault and force_sig_fault perform identical work. Just the type of the address paramter is different. So replace calls to force_sig_info_fault with calls to force_sig_fault, and remove force_sig_info_fault. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/x86: Call force_sig_pkuerr from __bad_area_nosemaphoreEric W. Biederman2018-09-211-52/+24
| | | | | | | | | | | | | | | | | There is only one code path that can generate a pkuerr signal. That code path calls __bad_area_nosemaphore and can be dectected by testing if si_code == SEGV_PKUERR. It can be seen from inspection that all of the other tests in fill_sig_info_pkey are unnecessary. Therefore call force_sig_pkuerr directly from __bad_area_semaphore and remove fill_sig_info_pkey. At the same time move the comment above force_sig_info_pkey into bad_area_access_error, so that the documentation about pkey generation races is not lost. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/x86: Pass pkey not vma into __bad_areaEric W. Biederman2018-09-211-12/+8
| | | | | | | | | | There is only one caller of __bad_area that passes in PKUERR and thus will generate a siginfo with si_pkey set. Therefore simplify the logic and hoist reading of vma_pkey up into that caller, and just pass *pkey into __bad_area. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/x86: Don't compute pkey in __do_page_faultEric W. Biederman2018-09-211-4/+0
| | | | | | | | There are no more users of the computed pkey value in __do_page_fault so stop computing the value. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/x86: Remove pkey parameter from mm_fault_errorEric W. Biederman2018-09-211-2/+2
| | | | | | | | | After the previous cleanups to do_sigbus and and bad_area_nosemaphore mm_fault_error no now longer uses it's pkey parameter. Therefore remove the unused parameter. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/x86: Remove the pkey parameter from do_sigbusEric W. Biederman2018-09-211-3/+3
| | | | | | | | | The function do_sigbus never sets si_code to PKUERR so it can never return a pkey to userspace. Therefore remove the unusable pkey parameter from do_sigbus. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/x86: Remove pkey parameter from bad_area_nosemaphoreEric W. Biederman2018-09-211-7/+7
| | | | | | | | | The function bad_area_nosemaphore always sets si_code to SEGV_MAPERR and as such can never return a pkey parameter. Therefore remove the unusable pkey parameter from bad_area_nosemaphore. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/x86/traps: Simplify trap generationEric W. Biederman2018-09-211-61/+24
| | | | | | | | | | | | | | Update the DO_ERROR macro to take si_code and si_addr values for a siginfo, removing the need for the fill_trap_info function. Update do_trap to also take the sicode and si_addr values for a sigininfo and modify the code to call force_sig when a sicode is not passed in and to call force_sig_fault when all of the information is present. Making this a more obvious, simpler and less error prone construction. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/x86/traps: Use force_sig instead of open coding it.Eric W. Biederman2018-09-211-1/+1
| | | | | | | | | | The function "force_sig(sig, tsk)" is equivalent to " force_sig_info(sig, SEND_SIG_PRIV, tsk)". Using the siginfo variants can be error prone so use the simpler old fashioned force_sig variant, and with luck the force_sig_info variant can go away. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/x86/traps: Use force_sig_bnderrEric W. Biederman2018-09-211-10/+9
| | | | | | | | | | | Instead of generating the siginfo in x86 specific code use the new helper function force_sig_bnderr to separate the concerns of collecting the information and generating a proper siginfo. Making the code easier to understand and maintain. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/x86/traps: Move more code into do_trap_no_signal so it can be reusedEric W. Biederman2018-09-211-16/+14
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | | The function do_trap_no_signal embodies almost all of the work of the function do_trap. The exceptions are setting of thread.error_code and thread.trap_nr in the case when the signal will be sent, and reporting which signal will be sent with show_signal. Filling in struct siginfo and then calling do_trap is problematic as filling in struct siginfo is an fiddly process that can through inattention has resulted in fields not initialized and the wrong fields being filled in. To avoid this error prone situation I am replacing force_sig_info with a set of functions that take as arguments the information needed to send a specific kind of signal. The function do_trap is called in the context of several different kinds of signals today. Having a solid do_trap_no_signal that can be reused allows call sites that send different kinds of signals to reuse all of the code in do_trap_no_signal. Modify do_trap_no_signal to have a single exit there signals where be sent (aka returning -1) to allow more of the signal sending path to be moved to from do_trap to do_trap_no_signal. Move setting thread.trap_nr and thread.error_code into do_trap_no_signal so the code does not need to be duplicated. Make the type of the string that is passed into do_trap_no_signal to const. The only user of that str is die and it already takes a const string, so this just makes it explicit that the string won't change. All of this prepares the way for using do_trap_no_signal outside of do_trap. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/x86/traps: Factor out show_signalEric W. Biederman2018-09-191-18/+19
| | | | | | | | | The code for conditionally printing unhanded signals is duplicated twice in arch/x86/kernel/traps.c. Factor it out into it's own subroutine called show_signal to make the code clearer and easier to maintain. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/x86: Move mpx siginfo generation into do_boundsEric W. Biederman2018-09-193-29/+32
| | | | | | | | This separates the logic of generating the signal from the logic of gathering the information about the bounds violation. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/x86: In trace_mpx_bounds_register_exception add __user annotationsEric W. Biederman2018-09-191-2/+2
| | | | | | | | | | | | | | The value passed in to addr_referenced is of type void __user *, so update the addr_referenced parameter in trace_mpx_bounds_register_exception to match. Also update the addr_referenced paramater in TP_STRUCT__entry as it again holdes the same value. I don't know why this was missed earlier but sparse was complaining when testing test branch so fix this now. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/x86: Use send_sig_mceerr as apropriateEric W. Biederman2018-09-191-10/+1
| | | | | | | This simplifies the code making it clearer what is going on. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
* signal/x86: Move MCE error reporting out of force_sig_info_faultEric W. Biederman2018-09-191-13/+13
| | | | | | | | | | | | | | | | Only the call from do_sigbus will send SIGBUS due to a memory machine check error. Consolidate all of the machine check signal generation code in do_sigbus and remove the now unnecessary fault parameter from force_sig_info_fault. Explicitly use the now constant si_code BUS_ADRERR in the call to force_sig_info_fault from do_sigbus. This makes the code in arch/x86/mm/fault.c easier to follower and simpler to maintain. Reviewed-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
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