This is a note to let you know that I've just added the patch titled
arm64: Remove unimplemented syscall log message
to the 4.15-stable tree which can be found at:
http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary
The filename of the patch is:
arm64-remove-unimplemented-syscall-log-message.patch
and it can be found in the queue-4.15 subdirectory.
If you, or anyone else, feels it should not be added to the stable tree,
please let <stable@xxxxxxxxxxxxxxx> know about it.
>From 1962682d2b2fbe6cfa995a85c53c069fadda473e Mon Sep 17 00:00:00 2001
From: Michael Weiser <michael.weiser@xxxxxx>
Date: Thu, 1 Feb 2018 23:13:36 +0100
Subject: arm64: Remove unimplemented syscall log message
From: Michael Weiser <michael.weiser@xxxxxx>
commit 1962682d2b2fbe6cfa995a85c53c069fadda473e 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@xxxxxxxxxxxxxxx>
Acked-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Michael Weiser <michael.weiser@xxxxxx>
Signed-off-by: Will Deacon <will.deacon@xxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
arch/arm64/kernel/traps.c | 8 --------
1 file changed, 8 deletions(-)
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -526,14 +526,6 @@ asmlinkage long do_ni_syscall(struct pt_
}
#endif
- if (show_unhandled_signals_ratelimited()) {
- pr_info("%s[%d]: syscall %d\n", current->comm,
- task_pid_nr(current), regs->syscallno);
- dump_instr("", regs);
- if (user_mode(regs))
- __show_regs(regs);
- }
-
return sys_ni_syscall();
}
Patches currently in stable-queue which might be from michael.weiser@xxxxxx are
queue-4.15/arm64-remove-unimplemented-syscall-log-message.patch
queue-4.15/arm64-disable-unhandled-signal-log-messages-by-default.patch