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Subject[tip:core/objtool 26/27] arch/x86/kernel/signal.c:357:16: sparse: got unsigned long long [usertype] *__pu_ptr
tree:   https://git.kernel.org/pub/scm/linux/kernel/git/tip/tip.git core/objtool
head: 29da93fea3ea39ab9b12270cc6be1b70ef201c9e
commit: 6ae865615fc43d014da2fd1f1bba7e81ee622d1b [26/27] x86/uaccess: Dont leak the AC flag into __put_user() argument evaluation
reproduce:
# apt-get install sparse
git checkout 6ae865615fc43d014da2fd1f1bba7e81ee622d1b
make ARCH=x86_64 allmodconfig
make C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__'

If you fix the issue, kindly add following tag
Reported-by: kbuild test robot <lkp@intel.com>

sparse warnings: (new ones prefixed by >>)

arch/x86/kernel/signal.c:357:16: sparse: sparse: cast removes address space '<asn:1>' of expression
arch/x86/kernel/signal.c:357:16: sparse: sparse: cast removes address space '<asn:1>' of expression
arch/x86/kernel/signal.c:357:16: sparse: sparse: cast removes address space '<asn:1>' of expression
arch/x86/kernel/signal.c:357:16: sparse: sparse: cast removes address space '<asn:1>' of expression
arch/x86/kernel/signal.c:357:16: sparse: sparse: cast removes address space '<asn:1>' of expression
arch/x86/kernel/signal.c:357:16: sparse: sparse: cast removes address space '<asn:1>' of expression
arch/x86/kernel/signal.c:357:16: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] <asn:1> * @@ got st volatile [noderef] <asn:1> * @@
arch/x86/kernel/signal.c:357:16: sparse: expected void const volatile [noderef] <asn:1> *
>> arch/x86/kernel/signal.c:357:16: sparse: got unsigned long long [usertype] *__pu_ptr
arch/x86/kernel/signal.c:417:17: sparse: sparse: cast removes address space '<asn:1>' of expression
arch/x86/kernel/signal.c:417:17: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected void const volatile [noderef] <asn:1> * @@ got st volatile [noderef] <asn:1> * @@
arch/x86/kernel/signal.c:417:17: sparse: expected void const volatile [noderef] <asn:1> *
arch/x86/kernel/signal.c:417:17: sparse: got unsigned long long [usertype] *
arch/x86/kernel/signal.c:417:17: sparse: sparse: cast removes address space '<asn:1>' of expression
arch/x86/kernel/signal.c:417:17: sparse: sparse: cast removes address space '<asn:1>' of expression
arch/x86/kernel/signal.c:417:17: sparse: sparse: cast removes address space '<asn:1>' of expression
arch/x86/kernel/signal.c:417:17: sparse: sparse: cast removes address space '<asn:1>' of expression
arch/x86/kernel/signal.c:417:17: sparse: sparse: cast removes address space '<asn:1>' of expression
arch/x86/kernel/signal.c:417:17: sparse: sparse: cast removes address space '<asn:1>' of expression
arch/x86/kernel/signal.c:417:17: sparse: sparse: cast removes address space '<asn:1>' of expression
arch/x86/kernel/signal.c:417:17: sparse: sparse: cast removes address space '<asn:1>' of expression
arch/x86/kernel/signal.c:417:17: sparse: sparse: cast removes address space '<asn:1>' of expression
arch/x86/kernel/signal.c:417:17: sparse: sparse: cast removes address space '<asn:1>' of expression

vim +357 arch/x86/kernel/signal.c

75779f05 arch/x86/kernel/signal.c Hiroshi Shimamoto 2009-02-27 312
7e907f48 arch/x86/kernel/signal_32.c Ingo Molnar 2008-03-06 313 static int
235b8022 arch/x86/kernel/signal.c Al Viro 2012-11-09 314 __setup_frame(int sig, struct ksignal *ksig, sigset_t *set,
7e907f48 arch/x86/kernel/signal_32.c Ingo Molnar 2008-03-06 315 struct pt_regs *regs)
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 316 {
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 317 struct sigframe __user *frame;
7e907f48 arch/x86/kernel/signal_32.c Ingo Molnar 2008-03-06 318 void __user *restorer;
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 319 int err = 0;
ab513701 arch/x86/kernel/signal_32.c Suresh Siddha 2008-07-29 320 void __user *fpstate = NULL;
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 321
235b8022 arch/x86/kernel/signal.c Al Viro 2012-11-09 322 frame = get_sigframe(&ksig->ka, regs, sizeof(*frame), &fpstate);
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 323
96d4f267 arch/x86/kernel/signal.c Linus Torvalds 2019-01-03 324 if (!access_ok(frame, sizeof(*frame)))
3d0aedd9 arch/x86/kernel/signal_32.c Hiroshi Shimamoto 2008-09-12 325 return -EFAULT;
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 326
2ba48e16 arch/x86/kernel/signal_32.c Hiroshi Shimamoto 2008-09-12 327 if (__put_user(sig, &frame->sig))
3d0aedd9 arch/x86/kernel/signal_32.c Hiroshi Shimamoto 2008-09-12 328 return -EFAULT;
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 329
2ba48e16 arch/x86/kernel/signal_32.c Hiroshi Shimamoto 2008-09-12 330 if (setup_sigcontext(&frame->sc, fpstate, regs, set->sig[0]))
3d0aedd9 arch/x86/kernel/signal_32.c Hiroshi Shimamoto 2008-09-12 331 return -EFAULT;
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 332
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 333 if (_NSIG_WORDS > 1) {
2ba48e16 arch/x86/kernel/signal_32.c Hiroshi Shimamoto 2008-09-12 334 if (__copy_to_user(&frame->extramask, &set->sig[1],
2ba48e16 arch/x86/kernel/signal_32.c Hiroshi Shimamoto 2008-09-12 335 sizeof(frame->extramask)))
3d0aedd9 arch/x86/kernel/signal_32.c Hiroshi Shimamoto 2008-09-12 336 return -EFAULT;
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 337 }
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 338
1a3e4ca4 arch/x86/kernel/signal_32.c Roland McGrath 2008-04-09 339 if (current->mm->context.vdso)
6f121e54 arch/x86/kernel/signal.c Andy Lutomirski 2014-05-05 340 restorer = current->mm->context.vdso +
0a6d1fa0 arch/x86/kernel/signal.c Andy Lutomirski 2015-10-05 341 vdso_image_32.sym___kernel_sigreturn;
9fbbd4dd arch/i386/kernel/signal.c Andi Kleen 2007-02-13 342 else
ade1af77 arch/x86/kernel/signal_32.c Jan Engelhardt 2008-01-30 343 restorer = &frame->retcode;
235b8022 arch/x86/kernel/signal.c Al Viro 2012-11-09 344 if (ksig->ka.sa.sa_flags & SA_RESTORER)
235b8022 arch/x86/kernel/signal.c Al Viro 2012-11-09 345 restorer = ksig->ka.sa.sa_restorer;
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 346
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 347 /* Set up to return from userspace. */
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 348 err |= __put_user(restorer, &frame->pretcode);
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 349
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 350 /*
7e907f48 arch/x86/kernel/signal_32.c Ingo Molnar 2008-03-06 351 * This is popl %eax ; movl $__NR_sigreturn, %eax ; int $0x80
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 352 *
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 353 * WE DO NOT USE IT ANY MORE! It's only left here for historical
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 354 * reasons and because gdb uses it as a signature to notice
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 355 * signal handler stack frames.
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 356 */
4a612048 arch/x86/kernel/signal_32.c Hiroshi Shimamoto 2008-11-11 @357 err |= __put_user(*((u64 *)&retcode), (u64 *)frame->retcode);
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 358
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 359 if (err)
3d0aedd9 arch/x86/kernel/signal_32.c Hiroshi Shimamoto 2008-09-12 360 return -EFAULT;
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 361
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 362 /* Set up registers for signal handler */
65ea5b03 arch/x86/kernel/signal_32.c H. Peter Anvin 2008-01-30 363 regs->sp = (unsigned long)frame;
235b8022 arch/x86/kernel/signal.c Al Viro 2012-11-09 364 regs->ip = (unsigned long)ksig->ka.sa.sa_handler;
65ea5b03 arch/x86/kernel/signal_32.c H. Peter Anvin 2008-01-30 365 regs->ax = (unsigned long)sig;
92bc2056 arch/x86/kernel/signal_32.c Harvey Harrison 2008-02-08 366 regs->dx = 0;
92bc2056 arch/x86/kernel/signal_32.c Harvey Harrison 2008-02-08 367 regs->cx = 0;
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 368
65ea5b03 arch/x86/kernel/signal_32.c H. Peter Anvin 2008-01-30 369 regs->ds = __USER_DS;
65ea5b03 arch/x86/kernel/signal_32.c H. Peter Anvin 2008-01-30 370 regs->es = __USER_DS;
65ea5b03 arch/x86/kernel/signal_32.c H. Peter Anvin 2008-01-30 371 regs->ss = __USER_DS;
65ea5b03 arch/x86/kernel/signal_32.c H. Peter Anvin 2008-01-30 372 regs->cs = __USER_CS;
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 373
283828f3 arch/i386/kernel/signal.c David Howells 2006-01-18 374 return 0;
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 375 }
^1da177e arch/i386/kernel/signal.c Linus Torvalds 2005-04-16 376

:::::: The code at line 357 was first introduced by commit
:::::: 4a61204856e8b28e9f5489a7875cb3a60afd1e43 x86: signal_32: introduce retcode and rt_retcode

:::::: TO: Hiroshi Shimamoto <h-shimamoto@ct.jp.nec.com>
:::::: CC: Ingo Molnar <mingo@elte.hu>

---
0-DAY kernel test infrastructure Open Source Technology Center
https://lists.01.org/pipermail/kbuild-all Intel Corporation

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