From: Willy Tarreau <w@1wt.eu>
To: Ammar Faizi <ammar.faizi@students.amikom.ac.id>
Cc: Paul Walmsley <paul.walmsley@sifive.com>,
Palmer Dabbelt <palmer@dabbelt.com>,
Albert Ou <aou@eecs.berkeley.edu>,
Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
Andy Lutomirski <luto@kernel.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
David Laight <David.Laight@ACULAB.COM>,
Peter Cordes <peter@cordes.ca>,
Bedirhan KURT <windowz414@gnuweeb.org>,
Louvian Lyndal <louvianlyndal@gmail.com>
Subject: Re: [PATCH 2/2] tools/nolibc: x86-64: Fix startup code bug
Date: Sat, 23 Oct 2021 15:43:23 +0200 [thread overview]
Message-ID: <20211023134323.GA5881@1wt.eu> (raw)
In-Reply-To: <v9gnbpcz7rxYUfmUijR-ammarfaizi2@intel.com>
On Sat, Oct 23, 2021 at 08:27:15PM +0700, Ammar Faizi wrote:
> Sorry for the delay, I got extra activities this week. Sorry for not
> giving any update lately.
No, really, don't be sorry, I'm myself quite busy, so I understnad, I
was just inquiring to arrange my time, nothing more.
> 1) I can send the %rsp alignment fix patch. I will send it today or
> tomorrow (GMT+07 time).
OK, no rush anyway. Even early next week is okay for me.
> 2) I can't send the syscall change used for exit. Because I only
> have x86 machine. So I can't apply the changes to other arch(s).
I see. I can do it for the various archs then, as the ones that are
supported are essentially the ones I can test.
> For (2), basically sys_exit doesn't close the entire process. Instead
> it only closes specific thread that calls that syscall. The libc uses
> sys_exit_group to close the process and its threads.
>
> ^ It's not really an urgent thing, because the nolibc.h may not be
> used for multithreaded app. Even so, I don't see something dangerous.
Yep that's what I understood as well, so we may easily postpone this.
> For (1), it's urgent, because the alignment violation causes segfault
> if the compiler generates aligned move, often when we compile it
> with -O3, usually that happens with SSE instructions, like `movdqa`,
> `movaps`.
Yes, that's what I saw from the other reports, I didn't notice it myself
but I probably faced it and attributed it to anything else.
> Preparing the patch...
Great, thank you!
Willy
next prev parent reply other threads:[~2021-10-23 13:44 UTC|newest]
Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-11 4:03 [PATCH] tools/nolibc: x86: Remove `r8`, `r9` and `r10` from the clobber list Ammar Faizi
2021-10-12 5:28 ` Willy Tarreau
2021-10-12 8:36 ` Ammar Faizi
2021-10-12 9:06 ` Willy Tarreau
2021-10-12 20:29 ` Borislav Petkov
2021-10-12 21:51 ` Borislav Petkov
2021-10-12 22:23 ` Ammar Faizi
2021-10-13 3:01 ` Willy Tarreau
2021-10-13 3:32 ` Ammar Faizi
2021-10-13 3:34 ` Ammar Faizi
2021-10-13 3:37 ` Ammar Faizi
2021-10-13 12:43 ` Borislav Petkov
2021-10-13 12:51 ` Willy Tarreau
2021-10-13 13:06 ` Borislav Petkov
2021-10-13 14:07 ` Willy Tarreau
2021-10-13 14:20 ` Borislav Petkov
2021-10-13 14:24 ` Willy Tarreau
2021-10-13 16:24 ` Michael Matz
2021-10-13 16:30 ` Willy Tarreau
2021-10-13 16:51 ` Andy Lutomirski
2021-10-13 16:52 ` Borislav Petkov
2021-10-14 8:44 ` Ammar Faizi
2021-10-14 12:44 ` Michael Matz
2021-10-14 14:31 ` Borislav Petkov
2021-10-19 9:06 ` David Laight
2021-10-23 20:40 ` H. Peter Anvin
2021-10-12 21:21 ` David Laight
2021-10-12 23:02 ` Subject: " Ammar Faizi
2021-10-13 9:03 ` [PATCH v2] " Ammar Faizi
2021-10-15 8:25 ` [PATCH 0/2] Fix clobber list and startup code bug Ammar Faizi
2021-10-15 8:25 ` [PATCH 1/2] tools/nolibc: x86: Remove `r8`, `r9` and `r10` from the clobber list Ammar Faizi
2021-10-18 5:52 ` Willy Tarreau
2021-10-15 8:25 ` [PATCH 2/2] tools/nolibc: x86-64: Fix startup code bug Ammar Faizi
2021-10-15 8:57 ` Ammar Faizi
2021-10-15 9:26 ` Bedirhan KURT
2021-10-15 9:58 ` Ammar Faizi
2021-10-15 9:41 ` Louvian Lyndal
2021-10-18 4:58 ` Willy Tarreau
2021-10-18 6:53 ` Ammar Faizi
2021-10-23 13:27 ` Ammar Faizi
2021-10-23 13:43 ` Willy Tarreau [this message]
2021-10-24 2:11 ` [PATCHSET v2 0/2] tools/nolibc: Fix startup code bug and small improvement Ammar Faizi
2021-10-24 2:11 ` [PATCH 1/2] tools/nolibc: x86-64: Fix startup code bug Ammar Faizi
2021-10-24 2:11 ` [PATCH 2/2] tools/nolibc: x86-64: Use `mov $60,%eax` instead of `mov $60,%rax` Ammar Faizi
2021-10-24 11:41 ` [PATCHSET v2 0/2] tools/nolibc: Fix startup code bug and small improvement Willy Tarreau
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