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X-CSE-ConnectionGUID: hvp3kjY8Rv6ABaV3yW6UUA== X-CSE-MsgGUID: 3wbbggECT96SJMu1aKUgOg== X-IronPort-AV: E=McAfee;i="6800,10657,11727"; a="85972358" X-IronPort-AV: E=Sophos;i="6.23,117,1770624000"; d="scan'208";a="85972358" Received: from orviesa006.jf.intel.com ([10.64.159.146]) by orvoesa104.jf.intel.com with ESMTP/TLS/ECDHE-RSA-AES256-GCM-SHA384; 13 Mar 2026 00:24:25 -0700 X-CSE-ConnectionGUID: UlApFBhxQfSj0AAsFhaQrA== X-CSE-MsgGUID: XCkFl2dXR7SY8xO6yFb7CA== X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="6.23,117,1770624000"; d="scan'208";a="220164496" Received: from lkp-server01.sh.intel.com (HELO 418530b1a366) ([10.239.97.150]) by orviesa006.jf.intel.com with ESMTP; 13 Mar 2026 00:24:23 -0700 Received: from kbuild by 418530b1a366 with local (Exim 4.98.2) (envelope-from ) id 1w0wse-000000003Zv-0EZd; Fri, 13 Mar 2026 07:24:20 +0000 Date: Fri, 13 Mar 2026 15:23:41 +0800 From: kernel test robot To: oe-kbuild@lists.linux.dev Cc: lkp@intel.com, Dan Carpenter Subject: [axboe:rw_iter 424/471] kernel/sched/debug.c:141 sched_feat_write() warn: potential spectre issue 'buf' [w] Message-ID: <202603131526.wBA9qa4z-lkp@intel.com> User-Agent: s-nail v14.9.25 Precedence: bulk X-Mailing-List: oe-kbuild@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: BCC: lkp@intel.com CC: oe-kbuild-all@lists.linux.dev TO: Jens Axboe tree: https://git.kernel.org/pub/scm/linux/kernel/git/axboe/linux.git rw_iter head: 0a49759be1c3b29207758e467fdc1a90d0716d06 commit: dee2a50905cf3505d706c0bdb2648900b643b4d3 [424/471] sched/debug: convert to read/write iterators :::::: branch date: 7 days ago :::::: commit date: 7 days ago config: openrisc-randconfig-r071-20260307 (https://download.01.org/0day-ci/archive/20260313/202603131526.wBA9qa4z-lkp@intel.com/config) compiler: or1k-linux-gcc (GCC) 15.2.0 smatch: v0.5.0-9004-gb810ac53 If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot | Reported-by: Dan Carpenter | Closes: https://lore.kernel.org/r/202603131526.wBA9qa4z-lkp@intel.com/ smatch warnings: kernel/sched/debug.c:141 sched_feat_write() warn: potential spectre issue 'buf' [w] vim +/buf +141 kernel/sched/debug.c d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 125) d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 126) static ssize_t dee2a50905cf350 Jens Axboe 2026-03-04 127 sched_feat_write(struct kiocb *iocb, struct iov_iter *from) d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 128) { dee2a50905cf350 Jens Axboe 2026-03-04 129 size_t cnt = iov_iter_count(from); d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 130) char buf[64]; d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 131) char *cmp; 8f894bf47dc9e8b Yisheng Xie 2018-05-31 132 int ret; d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 133) struct inode *inode; d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 134) d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 135) if (cnt > 63) d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 136) cnt = 63; d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 137) dee2a50905cf350 Jens Axboe 2026-03-04 138 if (!copy_from_iter_full(buf, cnt, from)) d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 139) return -EFAULT; d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 140) d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 @141) buf[cnt] = 0; d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 142) cmp = strstrip(buf); d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 143) d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 144) /* Ensure the static_key remains in a consistent state */ dee2a50905cf350 Jens Axboe 2026-03-04 145 inode = file_inode(iocb->ki_filp); e73e81975f2447e Jiada Wang 2018-07-31 146 cpus_read_lock(); d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 147) inode_lock(inode); 8f894bf47dc9e8b Yisheng Xie 2018-05-31 148 ret = sched_feat_set(cmp); d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 149) inode_unlock(inode); e73e81975f2447e Jiada Wang 2018-07-31 150 cpus_read_unlock(); 8f894bf47dc9e8b Yisheng Xie 2018-05-31 151 if (ret < 0) 8f894bf47dc9e8b Yisheng Xie 2018-05-31 152 return ret; d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 153) dee2a50905cf350 Jens Axboe 2026-03-04 154 iocb->ki_pos += cnt; d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 155) d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 156) return cnt; d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 157) } d6ca41d7922ce01 Steven Rostedt (Red Hat 2016-02-22 158) :::::: The code at line 141 was first introduced by commit :::::: d6ca41d7922ce0110a840ef4f8ec4afdd5a239d3 sched/debug: Move the /sys/kernel/debug/sched_features file setup into debug.c :::::: TO: Steven Rostedt (Red Hat) :::::: CC: Ingo Molnar -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki