linux-kernel - [PATCH 3.12 071/142] MIPS: Remove BUG_ON(!is_fpu_owner()) in do

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Message-Id: <6540a038754f78f73075f906ce42c04f84297e3e.1411724724.git.jslaby@suse.cz>
Date:	Fri, 26 Sep 2014 11:44:42 +0200
From:	Jiri Slaby <jslaby@...e.cz>
To:	stable@...r.kernel.org
Cc:	linux-kernel@...r.kernel.org, Huacai Chen <chenhc@...ote.com>,
	Jie Chen <chenj@...ote.com>, Rui Wang <wangr@...ote.com>,
	John Crispin <john@...ozen.org>,
	"Steven J. Hill" <Steven.Hill@...tec.com>,
	linux-mips@...ux-mips.org, Fuxin Zhang <zhangfx@...ote.com>,
	Zhangjin Wu <wuzhangjin@...il.com>,
	Ralf Baechle <ralf@...ux-mips.org>, Jiri Slaby <jslaby@...e.cz>
Subject: [PATCH 3.12 071/142] MIPS: Remove BUG_ON(!is_fpu_owner()) in do_ade()

From: Huacai Chen <chenhc@...ote.com>

3.12-stable review patch.  If anyone has any objections, please let me know.

===============

commit 2e5767a27337812f6850b3fa362419e2f085e5c3 upstream.

In do_ade(), is_fpu_owner() isn't preempt-safe. For example, when an
unaligned ldc1 is executed, do_cpu() is called and then FPU will be
enabled (and TIF_USEDFPU will be set for the current process). Then,
do_ade() is called because the access is unaligned.  If the current
process is preempted at this time, TIF_USEDFPU will be cleard.  So when
the process is scheduled again, BUG_ON(!is_fpu_owner()) is triggered.

This small program can trigger this BUG in a preemptible kernel:

int main (int argc, char *argv[])
{
        double u64[2];

        while (1) {
                asm volatile (
                        ".set push \n\t"
                        ".set noreorder \n\t"
                        "ldc1 $f3, 4(%0) \n\t"
                        ".set pop \n\t"
                        ::"r"(u64):
                );
        }

        return 0;
}

V2: Remove the BUG_ON() unconditionally due to Paul's suggestion.

Signed-off-by: Huacai Chen <chenhc@...ote.com>
Signed-off-by: Jie Chen <chenj@...ote.com>
Signed-off-by: Rui Wang <wangr@...ote.com>
Cc: John Crispin <john@...ozen.org>
Cc: Steven J. Hill <Steven.Hill@...tec.com>
Cc: linux-mips@...ux-mips.org
Cc: Fuxin Zhang <zhangfx@...ote.com>
Cc: Zhangjin Wu <wuzhangjin@...il.com>
Signed-off-by: Ralf Baechle <ralf@...ux-mips.org>
Signed-off-by: Jiri Slaby <jslaby@...e.cz>
---
 arch/mips/kernel/unaligned.c | 1 -
 1 file changed, 1 deletion(-)

diff --git a/arch/mips/kernel/unaligned.c b/arch/mips/kernel/unaligned.c
index c369a5d35527..b897dde93e7a 100644
--- a/arch/mips/kernel/unaligned.c
+++ b/arch/mips/kernel/unaligned.c
@@ -605,7 +605,6 @@ static void emulate_load_store_insn(struct pt_regs *regs,
 	case sdc1_op:
 		die_if_kernel("Unaligned FP access in kernel code", regs);
 		BUG_ON(!used_math());
-		BUG_ON(!is_fpu_owner());
 
 		lose_fpu(1);	/* Save FPU state for the emulator. */
 		res = fpu_emulator_cop1Handler(regs, &current->thread.fpu, 1,
-- 
2.1.0

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