From: Andrey Ryabinin <a.ryabinin@samsung.com>
To: Theodore Ts'o <tytso@mit.edu>
Cc: Andrew Morton <akpm@linux-foundation.org>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, "H. Peter Anvin" <hpa@zytor.com>,
Peter Zijlstra <peterz@infradead.org>,
Michal Marek <mmarek@suse.cz>,
Sasha Levin <sasha.levin@oracle.com>,
x86@kernel.org, linux-kbuild@vger.kernel.org,
linux-kernel@vger.kernel.org,
Andreas Dilger <adilger.kernel@dilger.ca>,
Dmitry Vyukov <dvyukov@google.com>,
Konstantin Khlebnikov <koct9i@gmail.com>
Subject: drivers: random: Shift out-of-bounds in _mix_pool_bytes
Date: Mon, 20 Oct 2014 15:03:22 +0400 [thread overview]
Message-ID: <5444EBFA.5030103@samsung.com> (raw)
In-Reply-To: <1413802499-17928-1-git-send-email-a.ryabinin@samsung.com>
Hi, Theodore.
I've got this while booting kernel with ubsan:
[ 0.000000] ================================================================================
[ 0.000000] UBSan: Undefined behaviour in ../include/linux/bitops.h:107:33
[ 0.000000] shift exponent 32 is to large for 32-bit type 'unsigned int'
[ 0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 3.18.0-rc1+ #64
[ 0.000000] 0000000000000020 0000000000000000 0000000000000000 ffffffff83003c68
[ 0.000000] ffffffff82add58a 000000000000009f 0000000000000020 ffffffff83003c78
[ 0.000000] ffffffff819a4519 ffffffff83003d28 ffffffff819a4a05 ffffffff82df889d
[ 0.000000] Call Trace:
[ 0.000000] dump_stack (/home/andrew/linux/ubsan_x86//lib/dump_stackc:52)
[ 0.000000] ubsan_epilogue (/home/andrew/linux/ubsan_x86//lib/ubsanc:159)
[ 0.000000] __ubsan_handle_shift_out_of_bounds (/home/andrew/linux/ubsan_x86//lib/ubsanc:458)
[ 0.000000] ? dmi_string_nosave (/home/andrew/linux/ubsan_x86//drivers/firmware/dmi_scanc:51)
[ 0.000000] ? dmi_string (/home/andrew/linux/ubsan_x86//drivers/firmware/dmi_scanc:72)
[ 0.000000] ? dmi_save_ident (/home/andrew/linux/ubsan_x86//drivers/firmware/dmi_scanc:159)
[ 0.000000] _mix_pool_bytes (/home/andrew/linux/ubsan_x86//include/linux/bitopsh:107 /home/andrew/linux/ubsan_x86//drivers/char/randomc:509)
[ 0.000000] ? dmi_decode (/home/andrew/linux/ubsan_x86//drivers/firmware/dmi_scanc:376)
[ 0.000000] ? dmi_walk_early (/home/andrew/linux/ubsan_x86//drivers/firmware/dmi_scanc:127)
[ 0.000000] add_device_randomness (/home/andrew/linux/ubsan_x86//drivers/char/randomc:747)
[ 0.000000] ? dmi_save_one_device (/home/andrew/linux/ubsan_x86//drivers/firmware/dmi_scanc:375)
[ 0.000000] ? dmi_save_one_device (/home/andrew/linux/ubsan_x86//drivers/firmware/dmi_scanc:375)
[ 0.000000] dmi_walk_early (/home/andrew/linux/ubsan_x86//drivers/firmware/dmi_scanc:127)
[ 0.000000] dmi_present (/home/andrew/linux/ubsan_x86//drivers/firmware/dmi_scanc:497)
[ 0.000000] dmi_scan_machine (/home/andrew/linux/ubsan_x86//drivers/firmware/dmi_scanc:555)
[ 0.000000] setup_arch (/home/andrew/linux/ubsan_x86//arch/x86/kernel/setupc:1022)
[ 0.000000] ? printk (/home/andrew/linux/ubsan_x86//kernel/printk/printkc:1849)
[ 0.000000] ? early_idt_handlers (/home/andrew/linux/ubsan_x86//arch/x86/kernel/head_64S:344)
[ 0.000000] start_kernel (/home/andrew/linux/ubsan_x86//include/linux/bitmaph:162 /home/andrew/linux/ubsan_x86//include/linux/cpumaskh:333
/home/andrew/linux/ubsan_x86//include/linux/mm_typesh:464 /home/andrew/linux/ubsan_x86//init/mainc:532)
[ 0.000000] ? early_idt_handlers (/home/andrew/linux/ubsan_x86//arch/x86/kernel/head_64S:344)
[ 0.000000] x86_64_start_reservations (/home/andrew/linux/ubsan_x86//arch/x86/kernel/head64c:194)
[ 0.000000] x86_64_start_kernel (/home/andrew/linux/ubsan_x86//arch/x86/kernel/head64c:183)
[ 0.000000] ================================================================================
next prev parent reply other threads:[~2014-10-20 11:03 UTC|newest]
Thread overview: 37+ messages / expand[flat|nested] mbox.gz Atom feed top
2014-10-20 10:54 [RFC] UBSan: run-time undefined behavior sanity checker Andrey Ryabinin
2014-10-20 10:54 ` [RFC PATCH] " Andrey Ryabinin
2014-10-20 19:35 ` Sasha Levin
2014-10-21 8:03 ` Andrey Ryabinin
2014-10-24 8:31 ` y.gribov
2014-10-24 10:36 ` Andrey Ryabinin
2014-10-21 9:47 ` Peter Zijlstra
2014-10-21 10:09 ` Andrey Ryabinin
2014-10-24 10:30 ` Peter Zijlstra
2014-10-21 17:06 ` Randy Dunlap
2014-10-22 9:58 ` Rasmus Villemoes
2014-10-22 11:16 ` Andrey Ryabinin
2014-10-20 11:03 ` Andrey Ryabinin [this message]
2014-10-20 12:49 ` drivers: random: Shift out-of-bounds in _mix_pool_bytes Theodore Ts'o
2014-10-20 13:58 ` Andrey Ryabinin
2014-10-20 14:08 ` Theodore Ts'o
2014-10-20 14:09 ` Daniel Borkmann
2014-10-20 14:13 ` Sasha Levin
2014-10-20 14:16 ` Theodore Ts'o
2014-10-20 14:42 ` Andrey Ryabinin
2014-10-24 10:01 ` Peter Zijlstra
2014-10-24 10:16 ` Andrey Ryabinin
2014-10-24 13:23 ` Sasha Levin
2014-10-24 13:42 ` Peter Zijlstra
2014-10-24 15:04 ` Sasha Levin
2014-10-24 15:10 ` Dmitry Vyukov
2014-10-24 21:05 ` One Thousand Gnomes
2014-10-24 22:23 ` H. Peter Anvin
2014-10-24 22:09 ` Andreas Dilger
2014-10-24 22:22 ` H. Peter Anvin
2014-10-25 0:50 ` Sasha Levin
2014-10-25 20:30 ` One Thousand Gnomes
2014-10-25 20:49 ` Andrey Ryabinin
2014-10-20 11:07 ` kernel: clockevents: shift out-of-bounds Andrey Ryabinin
2014-10-24 10:25 ` Peter Zijlstra
2014-10-20 11:16 ` fs: ext4: mballoc: negative shift exponent Andrey Ryabinin
2014-10-20 11:23 ` jbd2: revoke: negative shift exponent in hash() Andrey Ryabinin
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