Hi, [auto build test WARNING on next-20160512] [cannot apply to tip/x86/core v4.6-rc7 v4.6-rc6 v4.6-rc5 v4.6-rc7] [if your patch is applied to the wrong git tree, please drop us a note to help improving the system] url: https://github.com/0day-ci/linux/commits/Thomas-Garnier/x86-boot-KASLR-memory-randomization/20160513-033333 config: i386-randconfig-i1-05121127 (attached as .config) compiler: gcc-6 (Debian 6.1.1-1) 6.1.1 20160430 reproduce: # save the attached .config to linux build tree make ARCH=i386 All warnings (new ones prefixed by >>): arch/x86/boot/compressed/kaslr.c: In function 'find_random_virt_addr': >> arch/x86/boot/compressed/kaslr.c:390:16: warning: implicit declaration of function 'get_random_long' [-Wimplicit-function-declaration] random_addr = get_random_long("Virtual") % slots; ^~~~~~~~~~~~~~~ vim +/get_random_long +390 arch/x86/boot/compressed/kaslr.c 071a7493 Baoquan He 2016-05-09 374 { 071a7493 Baoquan He 2016-05-09 375 unsigned long slots, random_addr; 071a7493 Baoquan He 2016-05-09 376 071a7493 Baoquan He 2016-05-09 377 /* Make sure minimum is aligned. */ 071a7493 Baoquan He 2016-05-09 378 minimum = ALIGN(minimum, CONFIG_PHYSICAL_ALIGN); 071a7493 Baoquan He 2016-05-09 379 /* Align image_size for easy slot calculations. */ 071a7493 Baoquan He 2016-05-09 380 image_size = ALIGN(image_size, CONFIG_PHYSICAL_ALIGN); 071a7493 Baoquan He 2016-05-09 381 071a7493 Baoquan He 2016-05-09 382 /* 071a7493 Baoquan He 2016-05-09 383 * There are how many CONFIG_PHYSICAL_ALIGN-sized slots 071a7493 Baoquan He 2016-05-09 384 * that can hold image_size within the range of minimum to 071a7493 Baoquan He 2016-05-09 385 * KERNEL_IMAGE_SIZE? 071a7493 Baoquan He 2016-05-09 386 */ 071a7493 Baoquan He 2016-05-09 387 slots = (KERNEL_IMAGE_SIZE - minimum - image_size) / 071a7493 Baoquan He 2016-05-09 388 CONFIG_PHYSICAL_ALIGN + 1; 071a7493 Baoquan He 2016-05-09 389 d2d3462f Kees Cook 2016-05-09 @390 random_addr = get_random_long("Virtual") % slots; 071a7493 Baoquan He 2016-05-09 391 071a7493 Baoquan He 2016-05-09 392 return random_addr * CONFIG_PHYSICAL_ALIGN + minimum; 071a7493 Baoquan He 2016-05-09 393 } 071a7493 Baoquan He 2016-05-09 394 549f90db Borislav Petkov 2016-05-06 395 /* 549f90db Borislav Petkov 2016-05-06 396 * Since this function examines addresses much more numerically, 549f90db Borislav Petkov 2016-05-06 397 * it takes the input and output pointers as 'unsigned long'. 549f90db Borislav Petkov 2016-05-06 398 */ :::::: The code at line 390 was first introduced by commit :::::: d2d3462f9f08da364c8fbd41e8e32229d610d49d x86/KASLR: Clarify purpose of each get_random_long() :::::: TO: Kees Cook <keescook@xxxxxxxxxxxx> :::::: CC: Ingo Molnar <mingo@xxxxxxxxxx> --- 0-DAY kernel test infrastructure Open Source Technology Center https://lists.01.org/pipermail/kbuild-all Intel Corporation
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