From: "Jason A. Donenfeld" <Jason@zx2c4.com>
To: Arnd Bergmann <arnd@arndb.de>
Cc: "linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"open list:BROADCOM NVRAM DRIVER" <linux-mips@vger.kernel.org>,
Paul Burton <paulburton@kernel.org>,
Vincenzo Frascino <vincenzo.frascino@arm.com>,
Christian Brauner <christian.brauner@canonical.com>
Subject: Re: [PATCH] mips: vdso: conditionalize 32-bit time functions on COMPAT_32BIT_TIME
Date: Mon, 30 Dec 2019 22:09:20 +0100 [thread overview]
Message-ID: <CAHmME9r2G4viiF4sYqpuYOnFCtjWpjugqenoEeUrsU6MGBeSuQ@mail.gmail.com> (raw)
In-Reply-To: <CAK8P3a1AYGbgf6mmL-863+PXPBQw3AAtp5wQPL5duLCONGhHuw@mail.gmail.com>
On Mon, Dec 30, 2019 at 6:33 PM Arnd Bergmann <arnd@arndb.de> wrote
> Is this immediately before/after the syscall instruction or the
> indirect function call?
It's immediately after/before the call to the VDSO function itself.
Next I'll try to instrument the VDSO to get closer to that syscall.
I produced those reg dumps by hooking the page fault handler in the
kernel to print them and then disabling aslr and sticking a
`*(volatile int *)0 = 0;` in the code. Pretty gnarly.
next prev parent reply other threads:[~2019-12-30 21:09 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-12-23 13:08 vdso-related userspace crashes on 5.5 mips64 Jason A. Donenfeld
2019-12-23 21:44 ` Jason A. Donenfeld
2019-12-23 23:29 ` Paul Burton
2019-12-24 13:37 ` Jason A. Donenfeld
2019-12-30 15:58 ` Arnd Bergmann
2019-12-24 14:19 ` Jason A. Donenfeld
2019-12-24 13:54 ` [PATCH] mips: vdso: conditionalize 32-bit time functions on COMPAT_32BIT_TIME Jason A. Donenfeld
2019-12-30 11:57 ` Arnd Bergmann
2019-12-30 12:26 ` Jason A. Donenfeld
2019-12-30 12:34 ` Arnd Bergmann
2019-12-30 14:37 ` Jason A. Donenfeld
2019-12-30 15:10 ` Jason A. Donenfeld
2019-12-30 15:37 ` Arnd Bergmann
2019-12-30 15:39 ` Jason A. Donenfeld
2019-12-30 15:47 ` Arnd Bergmann
2019-12-30 15:58 ` Jason A. Donenfeld
2019-12-30 17:33 ` Arnd Bergmann
2019-12-30 21:09 ` Jason A. Donenfeld [this message]
2019-12-30 21:42 ` Jason A. Donenfeld
2019-12-31 16:14 ` Jason A. Donenfeld
2020-01-01 4:10 ` Paul Burton
2020-01-01 4:25 ` Paul Burton
2020-01-01 9:47 ` Jason A. Donenfeld
2020-01-01 9:47 ` Jason A. Donenfeld
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