- 27 Sep, 2018 24 commits
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Eric W. Biederman authored
Acked-by:
Vineet Gupta <vgupta@synopsys.com> Signed-off-by:
"Eric W. Biederman" <ebiederm@xmission.com>
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Eric W. Biederman authored
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:
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Eric W. Biederman authored
Acked-by:
Tony Luck <tony.luck@intel.com> Signed-off-by:
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Eric W. Biederman authored
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:
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Eric W. Biederman authored
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:
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Eric W. Biederman authored
This simplifies the code making it clearer what is going on, and making the siginfo generation easier to maintain. Signed-off-by: -
Eric W. Biederman authored
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Eric W. Biederman authored
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Eric W. Biederman authored
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 authored
Reviewed-by:
Catalin Marinas <catalin.marinas@arm.com> Tested-by:
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Eric W. Biederman authored
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:
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Eric W. Biederman authored
This will let the description be reused shortly. Reviewed-by:
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Eric W. Biederman authored
The function has no more callers so remove it. Reviewed-by:
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Eric W. Biederman authored
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:
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Eric W. Biederman authored
Wrap force_sig_fault with a helper that calls arm64_show_signal and call arm64_force_sig_fault where appropraite. Reviewed-by:
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Eric W. Biederman authored
This code is truly common between the signal sending cases so share it. Reviewed-by:
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Eric W. Biederman authored
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:
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Eric W. Biederman authored
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:
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Eric W. Biederman authored
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:
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Eric W. Biederman authored
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:
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Eric W. Biederman authored
This pepares for sending signals with something other than arm64_force_sig_info. Reviewed-by:
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Eric W. Biederman authored
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:
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Eric W. Biederman authored
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:
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Eric W. Biederman authored
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:
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- 21 Sep, 2018 16 commits
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Eric W. Biederman authored
Reviewed-by:
Stephen Rothwell <sfr@canb.auug.org.au> Signed-off-by:
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Eric W. Biederman authored
Call force_sig_pkuerr directly instead of rolling it by hand in _exception_pkey. Reviewed-by:
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Eric W. Biederman authored
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:
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Eric W. Biederman authored
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:
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Eric W. Biederman authored
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:
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Eric W. Biederman authored
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:
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Eric W. Biederman authored
This removes the need for other code paths to deal with pkey exceptions. Reviewed-by:
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Eric W. Biederman authored
There are no callers of __bad_area that pass in a pkey parameter so it makes no sense to take one. Reviewed-by:
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Eric W. Biederman authored
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:
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Eric W. Biederman authored
Reviewed-by:
Thomas Gleixner <tglx@linutronix.de> Signed-off-by:
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Eric W. Biederman authored
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:
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Eric W. Biederman authored
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:
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Eric W. Biederman authored
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:
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Eric W. Biederman authored
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:
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Eric W. Biederman authored
There are no more users of the computed pkey value in __do_page_fault so stop computing the value. Reviewed-by:
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Eric W. Biederman authored
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:
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