* [musl] [PATCH] [stable v4.4] arm64: Remove unimplemented syscall log message
@ 2021-06-02 11:46 Arnd Bergmann
2021-06-08 17:06 ` [musl] " Greg Kroah-Hartman
0 siblings, 1 reply; 2+ messages in thread
From: Arnd Bergmann @ 2021-06-02 11:46 UTC (permalink / raw)
To: stable
Cc: Michael Weiser, Martin Vajnar, musl, Will Deacon,
Greg Kroah-Hartman, Arnd Bergmann
From: Michael Weiser <michael.weiser@gmx.de>
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@vger.kernel.org>
Cc: Martin Vajnar <martin.vajnar@gmail.com>
Cc: musl@lists.openwall.com
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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
---
This was backported to v4.14 and later, but is missing in v4.4 and
before, apparently because of a trivial merge conflict. This is
a manual backport I did after I saw a report about the issue
by Martin Vajnar on the musl mailing list.
---
arch/arm64/kernel/traps.c | 8 --------
1 file changed, 8 deletions(-)
diff --git a/arch/arm64/kernel/traps.c b/arch/arm64/kernel/traps.c
index 02710f99c137..a8c0fd0574fa 100644
--- a/arch/arm64/kernel/traps.c
+++ b/arch/arm64/kernel/traps.c
@@ -381,14 +381,6 @@ 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();
}
--
2.29.2
^ permalink raw reply [flat|nested] 2+ messages in thread
* [musl] Re: [PATCH] [stable v4.4] arm64: Remove unimplemented syscall log message
2021-06-02 11:46 [musl] [PATCH] [stable v4.4] arm64: Remove unimplemented syscall log message Arnd Bergmann
@ 2021-06-08 17:06 ` Greg Kroah-Hartman
0 siblings, 0 replies; 2+ messages in thread
From: Greg Kroah-Hartman @ 2021-06-08 17:06 UTC (permalink / raw)
To: Arnd Bergmann
Cc: stable, Michael Weiser, Martin Vajnar, musl, Will Deacon, Arnd Bergmann
On Wed, Jun 02, 2021 at 01:46:51PM +0200, Arnd Bergmann wrote:
> From: Michael Weiser <michael.weiser@gmx.de>
>
> 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@vger.kernel.org>
> Cc: Martin Vajnar <martin.vajnar@gmail.com>
> Cc: musl@lists.openwall.com
> 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: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
> Signed-off-by: Arnd Bergmann <arnd@arndb.de>
> ---
> This was backported to v4.14 and later, but is missing in v4.4 and
> before, apparently because of a trivial merge conflict. This is
> a manual backport I did after I saw a report about the issue
> by Martin Vajnar on the musl mailing list.
> ---
> arch/arm64/kernel/traps.c | 8 --------
> 1 file changed, 8 deletions(-)
Now queued up, thanks.
greg k-h
^ permalink raw reply [flat|nested] 2+ messages in thread
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2021-06-08 17:06 ` [musl] " Greg Kroah-Hartman
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