From: Vincent Chen <deanbo422@gmail.com>
To: "Eric W. Biederman" <ebiederm@xmission.com>
Cc: linux-arch <linux-arch@vger.kernel.org>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
linux-api@vger.kernel.org, Vincent Chen <vincentc@andestech.com>,
Greentime Hu <greentime@andestech.com>,
Arnd Bergmann <arnd@arndb.de>
Subject: Re: [REVIEW][PATCH 05/17] signal/nds32: Use force_sig(SIGILL) in do_revisn
Date: Wed, 25 Apr 2018 20:10:22 +0800 [thread overview]
Message-ID: <CAJsyPhyDeafwUQxXgnZ9Rfj6nwYrU_Kgyfv8DQ2q0BkwW25BBw@mail.gmail.com> (raw)
In-Reply-To: <20180420010408.24438-5-ebiederm@xmission.com>
2018-04-20 9:03 GMT+08:00 Eric W. Biederman <ebiederm@xmission.com>:
> As originally committed do_revisn would deliver a siginfo for SIGILL
> with an si_code composed of random stack contents. That makes no
> sense and is not something userspace can depend on. So simplify
> the code and just use "force_sig(SIG_ILL, current)" instead.
>
> Fixes: 2923f5ea7738 ("nds32: Exception handling")
> Cc: Vincent Chen <vincentc@andestech.com>
> Cc: Greentime Hu <greentime@andestech.com>
> Cc: Arnd Bergmann <arnd@arndb.de>
> Signed-off-by: "Eric W. Biederman" <ebiederm@xmission.com>
> ---
> arch/nds32/kernel/traps.c | 5 +----
> 1 file changed, 1 insertion(+), 4 deletions(-)
>
> diff --git a/arch/nds32/kernel/traps.c b/arch/nds32/kernel/traps.c
> index 65961bf91d64..8e9a5b1f6234 100644
> --- a/arch/nds32/kernel/traps.c
> +++ b/arch/nds32/kernel/traps.c
> @@ -356,14 +356,11 @@ void do_dispatch_tlb_misc(unsigned long entry, unsigned long addr,
>
> void do_revinsn(struct pt_regs *regs)
> {
> - siginfo_t si;
> pr_emerg("Reserved Instruction\n");
> show_regs(regs);
> if (!user_mode(regs))
> do_exit(SIGILL);
> - si.si_signo = SIGILL;
> - si.si_errno = 0;
> - force_sig_info(SIGILL, &si, current);
> + force_sig(SIGILL, current);
> }
>
> #ifdef CONFIG_ALIGNMENT_TRAP
> --
> 2.14.1
>
You are right we do not store any valuable information in sigingo_t now.
However, We hope more information can be recorded by force_sig_fault()
as below instead of calling force_sig() directly.
- force_sig(SIGILL, current);
+ force_sig_fault(SIGILL, ILL_ILLTRP,
+ (void __user *)instruction_pointer(regs), current);
Thanks
Vincent Chen
next prev parent reply other threads:[~2018-04-25 12:10 UTC|newest]
Thread overview: 22+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-04-20 1:01 [REVIEW][PATCH 00/17] siginfo bugfixes and cleanups Eric W. Biederman
2018-04-20 1:03 ` [REVIEW][PATCH 01/17] signal/alpha: Document a conflict with SI_USER for SIGFPE Eric W. Biederman
2018-04-20 1:03 ` [REVIEW][PATCH 02/17] sparc: fix compat siginfo ABI regression Eric W. Biederman
2018-04-20 1:03 ` [REVIEW][PATCH 03/17] signal/sh: Use force_sig_fault in hw_breakpoint_handler Eric W. Biederman
2018-04-20 1:03 ` [REVIEW][PATCH 04/17] signal/nds32: Use force_sig in unhandled_interruption and unhandled_exceptions Eric W. Biederman
2018-04-25 12:14 ` Vincent Chen
2018-04-20 1:03 ` [REVIEW][PATCH 05/17] signal/nds32: Use force_sig(SIGILL) in do_revisn Eric W. Biederman
2018-04-25 12:10 ` Vincent Chen [this message]
2018-04-25 16:13 ` [PATCH] signal/nds32: More information in do_revinsn Eric W. Biederman
2018-04-26 3:02 ` Vincent Chen
2018-04-20 1:03 ` [REVIEW][PATCH 06/17] signal: Ensure every siginfo we send has all bits initialized Eric W. Biederman
2018-04-20 1:03 ` [REVIEW][PATCH 07/17] signal: Reduce copy_siginfo_to_user to just copy_to_user Eric W. Biederman
2018-04-20 1:03 ` [REVIEW][PATCH 08/17] signal: Stop special casing TRAP_FIXME and FPE_FIXME in siginfo_layout Eric W. Biederman
2018-04-20 1:04 ` [REVIEW][PATCH 09/17] signal: Remove SEGV_BNDERR ifdefs Eric W. Biederman
2018-04-20 1:04 ` [REVIEW][PATCH 10/17] signal: Remove ifdefs for BUS_MCEERR_AR and BUS_MCEERR_AO Eric W. Biederman
2018-04-20 1:04 ` [REVIEW][PATCH 11/17] signal/alpha: Replace FPE_FIXME with FPE_FLTUNK Eric W. Biederman
2018-04-20 1:04 ` [REVIEW][PATCH 12/17] signal/ia64: " Eric W. Biederman
2018-04-20 1:04 ` [REVIEW][PATCH 13/17] signal/powerpc: " Eric W. Biederman
2018-04-20 1:04 ` [REVIEW][PATCH 14/17] signal/unicore32: Use FPE_FLTUNK instead of 0 in ucf64_raise_sigfpe Eric W. Biederman
2018-04-20 1:04 ` [REVIEW][PATCH 15/17] signal: Add TRAP_UNK si_code for undiagnosted trap exceptions Eric W. Biederman
2018-04-20 1:04 ` [REVIEW][PATCH 16/17] signal/alpha: Replace TRAP_FIXME with TRAP_UNK Eric W. Biederman
2018-04-20 1:04 ` [REVIEW][PATCH 17/17] signal/powerpc: " Eric W. Biederman
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