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Date: Tue, 10 Aug 2021 16:31:33 +0300 From: Andy Shevchenko <andriy.shevchenko@...ux.intel.com> To: Chris von Recklinghausen <crecklin@...hat.com> Cc: pmladek@...e.com, rostedt@...dmis.org, senozhatsky@...omium.org, linux@...musvillemoes.dk, linux-kernel@...r.kernel.org Subject: Re: [PATCH] fix UBSAN splat in test_scanf On Mon, Aug 09, 2021 at 06:20:13AM -0400, Chris von Recklinghausen wrote: Thanks for the report and fix! First of all, have you seen this: https://lore.kernel.org/lkml/20210727150132.28920-1-andriy.shevchenko@linux.intel.com/T/#u ? > On a system with CONFIG_UBSAN_SHIFT=y, the following splat was observed: > [ 104.676826] test_scanf: loaded. > [ 104.680862] ================================================================================ > [ 104.690304] UBSAN: shift-out-of-bounds in lib/test_scanf.c:274:51 > [ 104.697144] shift exponent 32 is too large for 32-bit type 'unsigned int' As you may see in the above the rule of thumb is to include only meaningful parts of the oops. -- With Best Regards, Andy Shevchenko
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