linux/arch/s390
Eric W. Biederman ea64d5acc8 signal: Unify and correct copy_siginfo_to_user32
Among the existing architecture specific versions of
copy_siginfo_to_user32 there are several different implementation
problems.  Some architectures fail to handle all of the cases in in
the siginfo union.  Some architectures perform a blind copy of the
siginfo union when the si_code is negative.  A blind copy suggests the
data is expected to be in 32bit siginfo format, which means that
receiving such a signal via signalfd won't work, or that the data is
in 64bit siginfo and the code is copying nonsense to userspace.

Create a single instance of copy_siginfo_to_user32 that all of the
architectures can share, and teach it to handle all of the cases in
the siginfo union correctly, with the assumption that siginfo is
stored internally to the kernel is 64bit siginfo format.

A special case is made for x86 x32 format.  This is needed as presence
of both x32 and ia32 on x86_64 results in two different 32bit signal
formats.  By allowing this small special case there winds up being
exactly one code base that needs to be maintained between all of the
architectures.  Vastly increasing the testing base and the chances of
finding bugs.

As the x86 copy of copy_siginfo_to_user32 the call of the x86
signal_compat_build_tests were moved into sigaction_compat_abi, so
that they will keep running.

Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2018-01-15 19:56:20 -06:00
..
appldata s390: add a few more SPDX identifiers 2017-12-05 07:51:09 +01:00
boot s390: add a few more SPDX identifiers 2017-12-05 07:51:09 +01:00
configs s390: Remove CONFIG_HARDENED_USERCOPY 2017-11-16 13:12:21 +01:00
crypto s390: Remove redudant license text 2017-12-05 07:51:09 +01:00
hypfs s390: add a few more SPDX identifiers 2017-12-05 07:51:09 +01:00
include signal: unify compat_siginfo_t 2018-01-15 17:40:31 -06:00
kernel signal: Unify and correct copy_siginfo_to_user32 2018-01-15 19:56:20 -06:00
kvm KVM: s390: Fixes for 4.15 2017-12-06 15:55:44 +01:00
lib s390/spinlock: fix indentation 2017-11-14 22:07:58 +01:00
mm s390/mm: fix off-by-one bug in 5-level page table handling 2017-12-05 07:51:09 +01:00
net bpf, s390x: do not reload skb pointers in non-skb context 2017-12-15 09:19:35 -08:00
numa s390: add a few more SPDX identifiers 2017-12-05 07:51:09 +01:00
oprofile License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
pci s390: add a few more SPDX identifiers 2017-12-05 07:51:09 +01:00
tools s390: add a few more SPDX identifiers 2017-12-05 07:51:09 +01:00
defconfig s390: update defconfig 2017-10-16 08:19:28 +02:00
Kbuild s390: add a few more SPDX identifiers 2017-12-05 07:51:09 +01:00
Kconfig s390/perf: add perf_regs support and user stack dump 2017-11-16 15:06:11 +01:00
Kconfig.debug License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
Makefile s390: Remove redundant license text 2017-11-24 15:37:24 +01:00