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arm64: Remove unimplemented syscall log message
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commit 1962682 upstream.

Stop printing a (ratelimited) kernel message for each instance of an
unimplemented syscall being called. Userland making an unimplemented
syscall is not necessarily misbehaviour and to be expected with a
current userland running on an older kernel. Also, the current message
looks scary to users but does not actually indicate a real problem nor
help them narrow down the cause. Just rely on sys_ni_syscall() to return
-ENOSYS.

Cc: <stable@vger.kernel.org>
Acked-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Michael Weiser <michael.weiser@gmx.de>
Signed-off-by: Will Deacon <will.deacon@arm.com>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
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Michael Weiser authored and Greg Kroah-Hartman committed Jun 10, 2021
1 parent 124d79b commit 61a912d
Showing 1 changed file with 0 additions and 8 deletions.
8 changes: 0 additions & 8 deletions arch/arm64/kernel/traps.c
Original file line number Diff line number Diff line change
@@ -543,14 +543,6 @@ asmlinkage long do_ni_syscall(struct pt_regs *regs)
}
#endif

if (show_unhandled_signals_ratelimited()) {
pr_info("%s[%d]: syscall %d\n", current->comm,
task_pid_nr(current), (int)regs->syscallno);
dump_instr("", regs);
if (user_mode(regs))
__show_regs(regs);
}

return sys_ni_syscall();
}

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