Eric W. Biederman b5daf2b9d1 signal/parisc: Document a conflict with SI_USER with SIGFPE ... Setting si_code to 0 results in a userspace seeing an si_code of 0. This is the same si_code as SI_USER. Posix and common sense requires that SI_USER not be a signal specific si_code. As such this use of 0 for the si_code is a pretty horribly broken ABI. Further use of si_code == 0 guaranteed that copy_siginfo_to_user saw a value of __SI_KILL and now sees a value of SIL_KILL with the result that uid and pid fields are copied and which might copying the si_addr field by accident but certainly not by design. Making this a very flakey implementation. Utilizing FPE_FIXME siginfo_layout will now return SIL_FAULT and the appropriate fields will reliably be copied. This bug is 13 years old and parsic machines are no longer being built so I don't know if it possible or worth fixing it. But it is at least worth documenting this so other architectures don't make the same mistake. Possible ABI fixes includee: - Send the signal without siginfo - Don't generate a signal - Possibly assign and use an appropriate si_code - Don't handle cases which can't happen Cc: "James E.J. Bottomley" <jejb@parisc-linux.org> Cc: Helge Deller <deller@gmx.de> Cc: linux-parisc@vger.kernel.org Ref: 313c01d3e3fd ("[PATCH] PA-RISC update for 2.6.0") Histroy Tree: https://git.kernel.org/pub/scm/linux/kernel/git/tglx/history.git Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>		2018-01-12 14:21:03 -06:00
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bitsperlong.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
byteorder.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
errno.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
fcntl.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
ioctl.h	License cleanup: add SPDX license identifier to uapi header files with a license	2017-11-02 11:20:11 +01:00
ioctls.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
ipcbuf.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
Kbuild	bpf: correct broken uapi for BPF_PROG_TYPE_PERF_EVENT program type	2017-12-05 15:02:40 +01:00
mman.h	libnvdimm for 4.15	2017-11-17 09:51:57 -08:00
msgbuf.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
pdc.h	parisc: Make some PDC structures accessible in uapi headers	2017-11-17 15:27:42 +01:00
posix_types.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
ptrace.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
sembuf.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
setup.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
shmbuf.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
sigcontext.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
siginfo.h	signal/parisc: Document a conflict with SI_USER with SIGFPE	2018-01-12 14:21:03 -06:00
signal.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
socket.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
sockios.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
stat.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
statfs.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
swab.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
termbits.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
termios.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
types.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00
unistd.h	License cleanup: add SPDX license identifier to uapi header files with no license	2017-11-02 11:19:54 +01:00