linux-stable/arch/m68k/fpsp040
Eric W. Biederman a3616a3c02 signal/m68k: Use force_sigsegv(SIGSEGV) in fpsp040_die
In the fpsp040 code when copyin or copyout fails call
force_sigsegv(SIGSEGV) instead of do_exit(SIGSEGV).

This solves a couple of problems.  Because do_exit embeds the ptrace
stop PTRACE_EVENT_EXIT a complete stack frame needs to be present for
that to work correctly.  There is always the information needed for a
ptrace stop where get_signal is called.  So exiting with a signal
solves the ptrace issue.

Further exiting with a signal ensures that all of the threads in a
process are killed not just the thread that malfunctioned.  Which
avoids confusing userspace.

To make force_sigsegv(SIGSEGV) work in fpsp040_die modify the code to
save all of the registers and jump to ret_from_exception (which
ultimately calls get_signal) after fpsp040_die returns.

v2: Updated the branches to use gas's pseudo ops that automatically
    calculate the best branch instruction to use for the purpose.

v1: https://lkml.kernel.org/r/87a6m8kgtx.fsf_-_@disp2133
Link: https://lkml.kernel.org/r/87tukghjfs.fsf_-_@disp2133
Acked-by: Geert Uytterhoeven <geert@linux-m68k.org>
Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
2021-08-26 09:59:15 -05:00
..
bindec.S
binstr.S
bugfix.S
decbin.S
do_func.S
fpsp.h
gen_except.S
get_op.S
kernel_ex.S
Makefile m68k: fpsp040,ifpsp060: Remove meaningless EXTRA_LDFLAGS 2021-04-06 09:33:20 +02:00
README
res_func.S
round.S
sacos.S
sasin.S
satan.S
satanh.S
scale.S
scosh.S
setox.S
sgetem.S
sint.S
skeleton.S signal/m68k: Use force_sigsegv(SIGSEGV) in fpsp040_die 2021-08-26 09:59:15 -05:00
slog2.S
slogn.S
smovecr.S
srem_mod.S
ssin.S
ssinh.S
stan.S
stanh.S
sto_res.S
stwotox.S
tbldo.S
util.S
x_bsun.S
x_fline.S
x_operr.S
x_ovfl.S
x_snan.S
x_store.S
x_unfl.S
x_unimp.S
x_unsupp.S

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