From: Heiko Carstens <heiko.carstens@de.ibm.com>
To: Stephen Boyd <sboyd@codeaurora.org>
Cc: Arnd Bergmann <arnd@arndb.de>,
Martin Schwidefsky <schwidefsky@de.ibm.com>,
Russell King <linux@arm.linux.org.uk>,
linux-kernel@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Subject: Re: [PATCH v2] ARM: uaccess: Implement strict user copy checks
Date: Sat, 28 Aug 2010 09:43:04 +0200 [thread overview]
Message-ID: <20100828074304.GA2183@osiris.boeblingen.de.ibm.com> (raw)
In-Reply-To: <4C7867D4.10404@codeaurora.org>
On Fri, Aug 27, 2010 at 06:35:16PM -0700, Stephen Boyd wrote:
> On 08/25/2010 07:40 AM, Heiko Carstens wrote:
> > On Wed, Aug 25, 2010 at 03:55:53PM +0200, Arnd Bergmann wrote:
> >>
> >> If you don't want to see the warnings, then just remove the strict checks.
> >> We already concluded that there is little value in them on s390 since it only
> >> shows false postives.
> >>
> >> Maybe the easiest way would be to rename the option on s390 and move all
> >> the other ones into a common place.
> >
> > Yes, feel free to do that.
>
> Can you put up the false positives somewhere? I don't have easy access
> to an s390 toolchain to test build with and I'm interested to see how
> bad the false positives are.
>
> I'm slightly concerned that we'll just have this problem again when
> another arch comes along with false positives. But ignoring that issue
> is probably fine. I'll respin with a patch to move s390 to something
> like DEBUG_WARN_USER_COPY_CHECKS.
Sure:
In function 'copy_from_user',
inlined from 'write_enabled_file_bool' at kernel/kprobes.c:1973:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In function 'copy_from_user',
inlined from 'perf_copy_attr' at kernel/perf_event.c:4988,
inlined from 'SYSC_perf_event_open' at kernel/perf_event.c:5092,
inlined from 'SyS_perf_event_open' at kernel/perf_event.c:5077:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In function 'copy_from_user',
inlined from '__tun_chr_ioctl' at drivers/net/tun.c:1200:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In function 'copy_from_user',
inlined from 'pktgen_if_write' at net/core/pktgen.c:880:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In function 'copy_from_user',
inlined from 'pktgen_if_write' at net/core/pktgen.c:1143:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In function 'copy_from_user',
inlined from 'pktgen_if_write' at net/core/pktgen.c:1250:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In function 'copy_from_user',
inlined from 'pktgen_if_write' at net/core/pktgen.c:1272:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In function 'copy_from_user',
inlined from 'pktgen_if_write' at net/core/pktgen.c:1296:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In function 'copy_from_user',
inlined from 'pktgen_if_write' at net/core/pktgen.c:1319:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In function 'copy_from_user',
inlined from 'pktgen_if_write' at net/core/pktgen.c:1342:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In function 'copy_from_user',
inlined from 'pktgen_if_write' at net/core/pktgen.c:1363:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In function 'copy_from_user',
inlined from 'pktgen_if_write' at net/core/pktgen.c:1384:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In function 'copy_from_user',
inlined from 'pktgen_if_write' at net/core/pktgen.c:1405:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In function 'copy_from_user',
inlined from 'pktgen_if_write' at net/core/pktgen.c:1432:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In function 'copy_from_user',
inlined from 'pktgen_if_write' at net/core/pktgen.c:1468:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In function 'copy_from_user',
inlined from 'pktgen_thread_write' at net/core/pktgen.c:1792:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In function 'copy_from_user',
inlined from 'pktgen_thread_write' at net/core/pktgen.c:1823:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In function 'copy_from_user',
inlined from 'write_file_bool' at fs/debugfs/file.c:434:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In function 'copy_from_user',
inlined from 'sg_proc_write_dressz' at drivers/scsi/sg.c:2396:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In function 'copy_from_user',
inlined from 'sg_proc_write_adio' at drivers/scsi/sg.c:2373:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In function 'copy_from_user',
inlined from 'packet_getsockopt' at net/packet/af_packet.c:2123:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
In function 'copy_from_user',
inlined from 'compat_sys_socketcall' at net/compat.c:783:
/linux-2.6/arch/s390/include/asm/uaccess.h:297: warning: call to 'copy_from_user_overflow' declared with attribute warning: copy_from_user() buffer size is not provably correct
next prev parent reply other threads:[~2010-08-28 7:41 UTC|newest]
Thread overview: 30+ messages / expand[flat|nested] mbox.gz Atom feed top
2010-08-04 3:02 [PATCH] " Stephen Boyd
2010-08-10 22:46 ` Stephen Boyd
2010-08-10 22:55 ` Russell King - ARM Linux
2010-08-11 0:27 ` Stephen Boyd
2010-08-18 1:29 ` [PATCH v2] " Stephen Boyd
2010-08-18 12:28 ` Arnd Bergmann
2010-08-18 19:48 ` Stephen Boyd
2010-08-19 11:09 ` Arnd Bergmann
2010-08-24 15:06 ` Heiko Carstens
2010-08-24 15:26 ` Arnd Bergmann
2010-08-24 15:47 ` Heiko Carstens
2010-08-25 12:14 ` Arnd Bergmann
2010-08-25 12:54 ` Heiko Carstens
2010-08-25 13:55 ` Arnd Bergmann
2010-08-25 14:40 ` Heiko Carstens
2010-08-28 1:35 ` Stephen Boyd
2010-08-28 7:43 ` Heiko Carstens [this message]
2010-08-28 9:56 ` Arnd Bergmann
2010-09-04 4:49 ` Stephen Boyd
2010-09-14 3:07 ` Stephen Boyd
2010-09-14 8:25 ` Heiko Carstens
2010-09-14 13:10 ` Arnd Bergmann
2010-09-14 14:18 ` Heiko Carstens
2010-08-19 2:28 ` [PATCHv2 2/1] Consolidate CONFIG_DEBUG_STRICT_USER_COPY_CHECKS Stephen Boyd
2010-08-19 4:38 ` Arjan van de Ven
2010-08-19 4:47 ` Stephen Rothwell
2010-08-19 11:04 ` Arnd Bergmann
2010-08-11 3:04 ` [PATCH] ARM: uaccess: Implement strict user copy checks Arnd Bergmann
2010-08-11 18:46 ` Stephen Boyd
2010-08-12 15:00 ` Arnd Bergmann
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