linux-kernel - UBSAN: Undefined behaviour in arch/powerpc/kernel/cputable.c

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Date:   Fri, 9 Sep 2016 16:05:12 +0300 (EEST)
From:   Meelis Roos <mroos@...ux.ee>
To:     Linux Kernel list <linux-kernel@...r.kernel.org>,
        linuxppc-dev@...ts.ozlabs.org
Subject: UBSAN: Undefined behaviour in arch/powerpc/kernel/cputable.c

Got this on my PowerPC G4 (533 MHz, PowerPC 7410, PowerMac3,4 platform), 
with gcc version 5.3.1 20160509 (Debian 5.3.1-19):

[    0.000000] ================================================================================
[    0.000000] UBSAN: Undefined behaviour in arch/powerpc/kernel/cputable.c:2240:25
[    0.000000] shift exponent 32 is too large for 32-bit type 'long unsigned int'
[    0.000000] CPU: 0 PID: 0 Comm: swapper Not tainted 4.8.0-rc5-00075-gd71f058 #106
[    0.000000] Call Trace:
[    0.000000] [c0a5ff10] [c03aa588] ubsan_epilogue+0x18/0x4c (unreliable)
[    0.000000] [c0a5ff20] [c03aab38] __ubsan_handle_shift_out_of_bounds+0xe8/0x13c
[    0.000000] [c0a5ffa0] [c07c42d0] cpu_feature_keys_init+0xa0/0xb8
[    0.000000] [c0a5ffd0] [c07ca1fc] setup_feature_keys+0x14/0x24
[    0.000000] [c0a5ffe0] [c07c6c74] machine_init+0x18/0x58
[    0.000000] [c0a5fff0] [c000341c] start_here+0x38/0x78
[    0.000000] ================================================================================



-- 
Meelis Roos (mroos@...ux.ee)