arch/powerpc/kernel/signal_32.c:297:2: warning: Value stored to 'msr' is never read [clang-analyzer-deadcode.DeadStores]

From: kernel test robot
Date: Mon Aug 23 2021 - 07:01:14 EST

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tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master
head: e22ce8eb631bdc47a4a4ea7ecf4e4ba499db4f93
commit: ef75e73182949a94bde169a774de1b62ae21fbbc powerpc/signal32: Transform save_user_regs() and save_tm_user_regs() in 'unsafe' version
date: 9 months ago
config: powerpc-randconfig-c003-20210821 (attached as .config)
compiler: clang version 14.0.0 (https://github.com/llvm/llvm-project d9c5613e856cf2addfbf892fc4c1ce9ef9feceaa)
reproduce (this is a W=1 build):
wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross
chmod +x ~/bin/make.cross
# install powerpc cross compiling tool for clang build
# apt-get install binutils-powerpc-linux-gnu
# https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=ef75e73182949a94bde169a774de1b62ae21fbbc
git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
git fetch --no-tags linus master
git checkout ef75e73182949a94bde169a774de1b62ae21fbbc
# save the attached .config to linux build tree
COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=powerpc clang-analyzer

If you fix the issue, kindly add following tag as appropriate
Reported-by: kernel test robot <lkp@xxxxxxxxx>

clang-analyzer warnings: (new ones prefixed by >>)
^
crypto/ecc.c:880:7: note: Assuming the condition is false
if (EVEN(a)) {
^
crypto/ecc.c:853:20: note: expanded from macro 'EVEN'
#define EVEN(vli) (!(vli[0] & 1))
^~~~~~~~~~~~~
crypto/ecc.c:880:3: note: Taking false branch
if (EVEN(a)) {
^
crypto/ecc.c:889:14: note: Assuming the condition is true
} else if (EVEN(b)) {
^
crypto/ecc.c:853:20: note: expanded from macro 'EVEN'
#define EVEN(vli) (!(vli[0] & 1))
^~~~~~~~~~~~~
crypto/ecc.c:889:10: note: Taking true branch
} else if (EVEN(b)) {
^
crypto/ecc.c:892:9: note: The left operand of '&' is a garbage value
if (!EVEN(v))
^
crypto/ecc.c:853:29: note: expanded from macro 'EVEN'
#define EVEN(vli) (!(vli[0] & 1))
~~~~~~ ^
crypto/ecc.c:920:9: warning: The left operand of '&' is a garbage value [clang-analyzer-core.UndefinedBinaryOperatorResult]
if (!EVEN(v))
^
crypto/ecc.c:853:29: note: expanded from macro 'EVEN'
#define EVEN(vli) (!(vli[0] & 1))
^
crypto/ecc.c:1245:2: note: Calling 'ecc_point_add'
ecc_point_add(&sum, p, q, curve);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/ecc.c:1221:2: note: Calling 'vli_mod_inv'
vli_mod_inv(z, z, curve->p, ndigits);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/ecc.c:866:6: note: Assuming the condition is false
if (vli_is_zero(input, ndigits)) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/ecc.c:866:2: note: Taking false branch
if (vli_is_zero(input, ndigits)) {
^
crypto/ecc.c:875:2: note: Calling 'vli_clear'
vli_clear(v, ndigits);
^~~~~~~~~~~~~~~~~~~~~
crypto/ecc.c:113:2: note: Loop condition is false. Execution continues on line 113
for (i = 0; i < ndigits; i++)
^
crypto/ecc.c:115:1: note: Returning without writing to '*vli'
}
^
crypto/ecc.c:875:2: note: Returning from 'vli_clear'
vli_clear(v, ndigits);
^~~~~~~~~~~~~~~~~~~~~
crypto/ecc.c:877:9: note: Assuming the condition is true
while ((cmp_result = vli_cmp(a, b, ndigits)) != 0) {
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/ecc.c:877:2: note: Loop condition is true. Entering loop body
while ((cmp_result = vli_cmp(a, b, ndigits)) != 0) {
^
crypto/ecc.c:880:7: note: Assuming the condition is false
if (EVEN(a)) {
^
crypto/ecc.c:853:20: note: expanded from macro 'EVEN'
#define EVEN(vli) (!(vli[0] & 1))
^~~~~~~~~~~~~
crypto/ecc.c:880:3: note: Taking false branch
if (EVEN(a)) {
^
crypto/ecc.c:889:14: note: Assuming the condition is false
} else if (EVEN(b)) {
^
crypto/ecc.c:853:20: note: expanded from macro 'EVEN'
#define EVEN(vli) (!(vli[0] & 1))
^~~~~~~~~~~~~
crypto/ecc.c:889:10: note: Taking false branch
} else if (EVEN(b)) {
^
crypto/ecc.c:898:14: note: Assuming 'cmp_result' is <= 0
} else if (cmp_result > 0) {
^~~~~~~~~~~~~~
crypto/ecc.c:898:10: note: Taking false branch
} else if (cmp_result > 0) {
^
crypto/ecc.c:916:8: note: Assuming the condition is false
if (vli_cmp(v, u, ndigits) < 0)
^~~~~~~~~~~~~~~~~~~~~~~~~~
crypto/ecc.c:916:4: note: Taking false branch
if (vli_cmp(v, u, ndigits) < 0)
^
crypto/ecc.c:920:9: note: The left operand of '&' is a garbage value
if (!EVEN(v))
^
crypto/ecc.c:853:29: note: expanded from macro 'EVEN'
#define EVEN(vli) (!(vli[0] & 1))
~~~~~~ ^
Suppressed 2 warnings (1 in non-user code, 1 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
5 warnings generated.
>> arch/powerpc/kernel/signal_32.c:297:2: warning: Value stored to 'msr' is never read [clang-analyzer-deadcode.DeadStores]
msr &= ~MSR_VSX;
^ ~~~~~~~~
arch/powerpc/kernel/signal_32.c:297:2: note: Value stored to 'msr' is never read
msr &= ~MSR_VSX;
^ ~~~~~~~~
arch/powerpc/kernel/signal_32.c:765:16: warning: Value stored to 'msr' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
unsigned long msr = regs->msr;
^~~ ~~~~~~~~~
arch/powerpc/kernel/signal_32.c:765:16: note: Value stored to 'msr' during its initialization is never read
unsigned long msr = regs->msr;
^~~ ~~~~~~~~~
arch/powerpc/kernel/signal_32.c:869:16: warning: Value stored to 'msr' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
unsigned long msr = regs->msr;
^~~ ~~~~~~~~~
arch/powerpc/kernel/signal_32.c:869:16: note: Value stored to 'msr' during its initialization is never read
unsigned long msr = regs->msr;
^~~ ~~~~~~~~~
Suppressed 2 warnings (1 in non-user code, 1 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (1 in non-user code, 1 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
3 warnings generated.
arch/powerpc/kernel/vdso.c:251:8: warning: Dereference of null pointer (loaded from variable 'size') [clang-analyzer-core.NullDereference]
*size = 0;
^
arch/powerpc/kernel/vdso.c:750:6: note: Calling 'vdso_setup'
if (vdso_setup()) {
^~~~~~~~~~~~
arch/powerpc/kernel/vdso.c:618:6: note: Calling 'vdso_do_find_sections'
if (vdso_do_find_sections(&v32, &v64))
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/kernel/vdso.c:440:52: note: Passing null pointer value via 3rd parameter 'size'
v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL);
^
include/linux/stddef.h:8:14: note: expanded from macro 'NULL'
#define NULL ((void *)0)
^~~~~~~~~~~
arch/powerpc/kernel/vdso.c:440:16: note: Calling 'find_section32'
v32->dynstr = find_section32(v32->hdr, ".dynstr", NULL);
^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
arch/powerpc/kernel/vdso.c:244:14: note: 'i' is >= field 'e_shnum'
for (i = 1; i < ehdr->e_shnum; i++) {
^
arch/powerpc/kernel/vdso.c:244:2: note: Loop condition is false. Execution continues on line 251
for (i = 1; i < ehdr->e_shnum; i++) {
^
arch/powerpc/kernel/vdso.c:251:8: note: Dereference of null pointer (loaded from variable 'size')
*size = 0;
~~~~ ^
Suppressed 2 warnings (1 in non-user code, 1 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (1 in non-user code, 1 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (1 in non-user code, 1 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
2 warnings generated.
Suppressed 2 warnings (1 in non-user code, 1 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
6 warnings generated.
fs/fscache/object.c:284:2: warning: Value stored to 'start' is never read [clang-analyzer-deadcode.DeadStores]
start = jiffies;
^ ~~~~~~~
fs/fscache/object.c:284:2: note: Value stored to 'start' is never read
start = jiffies;
^ ~~~~~~~
fs/fscache/object.c:454:25: warning: Value stored to 'cookie' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
struct fscache_cookie *cookie = object->cookie;
^~~~~~ ~~~~~~~~~~~~~~
fs/fscache/object.c:454:25: note: Value stored to 'cookie' during its initialization is never read
struct fscache_cookie *cookie = object->cookie;
^~~~~~ ~~~~~~~~~~~~~~
Suppressed 4 warnings (1 in non-user code, 3 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
4 warnings generated.
fs/fscache/operation.c:627:2: warning: Value stored to 'start' is never read [clang-analyzer-deadcode.DeadStores]
start = jiffies;
^ ~~~~~~~
fs/fscache/operation.c:627:2: note: Value stored to 'start' is never read
start = jiffies;
^ ~~~~~~~
Suppressed 3 warnings (1 in non-user code, 2 with check filters).
Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well.
7 warnings generated.
fs/fscache/page.c:354:2: warning: Value stored to 'jif' is never read [clang-analyzer-deadcode.DeadStores]
jif = jiffies;
^ ~~~~~~~
fs/fscache/page.c:354:2: note: Value stored to 'jif' is never read
jif = jiffies;
^ ~~~~~~~
fs/fscache/page.c:409:32: warning: Value stored to 'state' during its initialization is never read [clang-analyzer-deadcode.DeadStores]
enum fscache_operation_state state = op->state;
^~~~~ ~~~~~~~~~
fs/fscache/page.c:409:32: note: Value stored to 'state' during its initialization is never read
enum fscache_operation_state state = op->state;
^~~~~ ~~~~~~~~~
fs/fscache/page.c:998:2: warning: Value stored to 'ret' is never read [clang-analyzer-deadcode.DeadStores]
ret = -ENOBUFS;

vim +/msr +297 arch/powerpc/kernel/signal_32.c

968c4fccd1bb8b arch/powerpc/kernel/signal_32.c Christophe Leroy 2020-08-18 262
ef75e73182949a arch/powerpc/kernel/signal_32.c Christophe Leroy 2020-08-18 263 static int save_user_regs_unsafe(struct pt_regs *regs, struct mcontext __user *frame,
8d33001dd650b8 arch/powerpc/kernel/signal_32.c Christophe Leroy 2020-08-18 264 struct mcontext __user *tm_frame, int ctx_has_vsx_region)
^1da177e4c3f41 arch/ppc64/kernel/signal32.c Linus Torvalds 2005-04-16 265 {
9e7511861c4f8d arch/powerpc/kernel/signal_32.c Michael Neuling 2008-06-25 266 unsigned long msr = regs->msr;
9e7511861c4f8d arch/powerpc/kernel/signal_32.c Michael Neuling 2008-06-25 267
c6e6771b87d4e3 arch/powerpc/kernel/signal_32.c Michael Neuling 2008-06-25 268 /* save general registers */
ef75e73182949a arch/powerpc/kernel/signal_32.c Christophe Leroy 2020-08-18 269 unsafe_save_general_regs(regs, frame, failed);
^1da177e4c3f41 arch/ppc64/kernel/signal32.c Linus Torvalds 2005-04-16 270
^1da177e4c3f41 arch/ppc64/kernel/signal32.c Linus Torvalds 2005-04-16 271 #ifdef CONFIG_ALTIVEC
^1da177e4c3f41 arch/ppc64/kernel/signal32.c Linus Torvalds 2005-04-16 272 /* save altivec registers */
^1da177e4c3f41 arch/ppc64/kernel/signal32.c Linus Torvalds 2005-04-16 273 if (current->thread.used_vr) {
ef75e73182949a arch/powerpc/kernel/signal_32.c Christophe Leroy 2020-08-18 274 unsafe_copy_to_user(&frame->mc_vregs, &current->thread.vr_state,
ef75e73182949a arch/powerpc/kernel/signal_32.c Christophe Leroy 2020-08-18 275 ELF_NVRREG * sizeof(vector128), failed);
^1da177e4c3f41 arch/ppc64/kernel/signal32.c Linus Torvalds 2005-04-16 276 /* set MSR_VEC in the saved MSR value to indicate that
^1da177e4c3f41 arch/ppc64/kernel/signal32.c Linus Torvalds 2005-04-16 277 frame->mc_vregs contains valid data */
9e7511861c4f8d arch/powerpc/kernel/signal_32.c Michael Neuling 2008-06-25 278 msr |= MSR_VEC;
^1da177e4c3f41 arch/ppc64/kernel/signal32.c Linus Torvalds 2005-04-16 279 }
^1da177e4c3f41 arch/ppc64/kernel/signal32.c Linus Torvalds 2005-04-16 280 /* else assert((regs->msr & MSR_VEC) == 0) */
^1da177e4c3f41 arch/ppc64/kernel/signal32.c Linus Torvalds 2005-04-16 281
^1da177e4c3f41 arch/ppc64/kernel/signal32.c Linus Torvalds 2005-04-16 282 /* We always copy to/from vrsave, it's 0 if we don't have or don't
^1da177e4c3f41 arch/ppc64/kernel/signal32.c Linus Torvalds 2005-04-16 283 * use altivec. Since VSCR only contains 32 bits saved in the least
^1da177e4c3f41 arch/ppc64/kernel/signal32.c Linus Torvalds 2005-04-16 284 * significant bits of a vector, we "cheat" and stuff VRSAVE in the
^1da177e4c3f41 arch/ppc64/kernel/signal32.c Linus Torvalds 2005-04-16 285 * most significant bits of that same vector. --BenH
408a7e08b2112f arch/powerpc/kernel/signal_32.c Paul Mackerras 2013-08-05 286 * Note that the current VRSAVE value is in the SPR at this point.
^1da177e4c3f41 arch/ppc64/kernel/signal32.c Linus Torvalds 2005-04-16 287 */
ef75e73182949a arch/powerpc/kernel/signal_32.c Christophe Leroy 2020-08-18 288 unsafe_put_user(current->thread.vrsave, (u32 __user *)&frame->mc_vregs[32],
ef75e73182949a arch/powerpc/kernel/signal_32.c Christophe Leroy 2020-08-18 289 failed);
^1da177e4c3f41 arch/ppc64/kernel/signal32.c Linus Torvalds 2005-04-16 290 #endif /* CONFIG_ALTIVEC */
ef75e73182949a arch/powerpc/kernel/signal_32.c Christophe Leroy 2020-08-18 291 unsafe_copy_fpr_to_user(&frame->mc_fregs, current, failed);
ec67ad82814bee arch/powerpc/kernel/signal_32.c Michael Neuling 2013-11-25 292
ec67ad82814bee arch/powerpc/kernel/signal_32.c Michael Neuling 2013-11-25 293 /*
ec67ad82814bee arch/powerpc/kernel/signal_32.c Michael Neuling 2013-11-25 294 * Clear the MSR VSX bit to indicate there is no valid state attached
ec67ad82814bee arch/powerpc/kernel/signal_32.c Michael Neuling 2013-11-25 295 * to this context, except in the specific case below where we set it.
ec67ad82814bee arch/powerpc/kernel/signal_32.c Michael Neuling 2013-11-25 296 */
ec67ad82814bee arch/powerpc/kernel/signal_32.c Michael Neuling 2013-11-25 @297 msr &= ~MSR_VSX;
6a274c08f2f4df arch/powerpc/kernel/signal_32.c Michael Neuling 2008-07-02 298 #ifdef CONFIG_VSX
ce48b2100785e5 arch/powerpc/kernel/signal_32.c Michael Neuling 2008-06-25 299 /*
ce48b2100785e5 arch/powerpc/kernel/signal_32.c Michael Neuling 2008-06-25 300 * Copy VSR 0-31 upper half from thread_struct to local
ce48b2100785e5 arch/powerpc/kernel/signal_32.c Michael Neuling 2008-06-25 301 * buffer, then write that to userspace. Also set MSR_VSX in
ce48b2100785e5 arch/powerpc/kernel/signal_32.c Michael Neuling 2008-06-25 302 * the saved MSR value to indicate that frame->mc_vregs
ce48b2100785e5 arch/powerpc/kernel/signal_32.c Michael Neuling 2008-06-25 303 * contains valid data
ce48b2100785e5 arch/powerpc/kernel/signal_32.c Michael Neuling 2008-06-25 304 */
16c29d180becc5 arch/powerpc/kernel/signal_32.c Michael Neuling 2008-10-23 305 if (current->thread.used_vsr && ctx_has_vsx_region) {
ef75e73182949a arch/powerpc/kernel/signal_32.c Christophe Leroy 2020-08-18 306 unsafe_copy_vsx_to_user(&frame->mc_vsregs, current, failed);
ce48b2100785e5 arch/powerpc/kernel/signal_32.c Michael Neuling 2008-06-25 307 msr |= MSR_VSX;
ec67ad82814bee arch/powerpc/kernel/signal_32.c Michael Neuling 2013-11-25 308 }
c6e6771b87d4e3 arch/powerpc/kernel/signal_32.c Michael Neuling 2008-06-25 309 #endif /* CONFIG_VSX */
81e7009ea46c95 arch/powerpc/kernel/signal_32.c Stephen Rothwell 2005-10-18 310 #ifdef CONFIG_SPE
81e7009ea46c95 arch/powerpc/kernel/signal_32.c Stephen Rothwell 2005-10-18 311 /* save spe registers */
81e7009ea46c95 arch/powerpc/kernel/signal_32.c Stephen Rothwell 2005-10-18 312 if (current->thread.used_spe) {
ef75e73182949a arch/powerpc/kernel/signal_32.c Christophe Leroy 2020-08-18 313 unsafe_copy_to_user(&frame->mc_vregs, current->thread.evr,
ef75e73182949a arch/powerpc/kernel/signal_32.c Christophe Leroy 2020-08-18 314 ELF_NEVRREG * sizeof(u32), failed);
81e7009ea46c95 arch/powerpc/kernel/signal_32.c Stephen Rothwell 2005-10-18 315 /* set MSR_SPE in the saved MSR value to indicate that
81e7009ea46c95 arch/powerpc/kernel/signal_32.c Stephen Rothwell 2005-10-18 316 frame->mc_vregs contains valid data */
9e7511861c4f8d arch/powerpc/kernel/signal_32.c Michael Neuling 2008-06-25 317 msr |= MSR_SPE;
81e7009ea46c95 arch/powerpc/kernel/signal_32.c Stephen Rothwell 2005-10-18 318 }
81e7009ea46c95 arch/powerpc/kernel/signal_32.c Stephen Rothwell 2005-10-18 319 /* else assert((regs->msr & MSR_SPE) == 0) */
81e7009ea46c95 arch/powerpc/kernel/signal_32.c Stephen Rothwell 2005-10-18 320
81e7009ea46c95 arch/powerpc/kernel/signal_32.c Stephen Rothwell 2005-10-18 321 /* We always copy to/from spefscr */
ef75e73182949a arch/powerpc/kernel/signal_32.c Christophe Leroy 2020-08-18 322 unsafe_put_user(current->thread.spefscr,
ef75e73182949a arch/powerpc/kernel/signal_32.c Christophe Leroy 2020-08-18 323 (u32 __user *)&frame->mc_vregs + ELF_NEVRREG, failed);
81e7009ea46c95 arch/powerpc/kernel/signal_32.c Stephen Rothwell 2005-10-18 324 #endif /* CONFIG_SPE */
81e7009ea46c95 arch/powerpc/kernel/signal_32.c Stephen Rothwell 2005-10-18 325
ef75e73182949a arch/powerpc/kernel/signal_32.c Christophe Leroy 2020-08-18 326 unsafe_put_user(msr, &frame->mc_gregs[PT_MSR], failed);
ef75e73182949a arch/powerpc/kernel/signal_32.c Christophe Leroy 2020-08-18 327
1d25f11fdbcc53 arch/powerpc/kernel/signal_32.c Michael Neuling 2013-06-09 328 /* We need to write 0 the MSR top 32 bits in the tm frame so that we
1d25f11fdbcc53 arch/powerpc/kernel/signal_32.c Michael Neuling 2013-06-09 329 * can check it on the restore to see if TM is active
1d25f11fdbcc53 arch/powerpc/kernel/signal_32.c Michael Neuling 2013-06-09 330 */
ef75e73182949a arch/powerpc/kernel/signal_32.c Christophe Leroy 2020-08-18 331 if (tm_frame)
ef75e73182949a arch/powerpc/kernel/signal_32.c Christophe Leroy 2020-08-18 332 unsafe_put_user(0, &tm_frame->mc_gregs[PT_MSR], failed);
1d25f11fdbcc53 arch/powerpc/kernel/signal_32.c Michael Neuling 2013-06-09 333
^1da177e4c3f41 arch/ppc64/kernel/signal32.c Linus Torvalds 2005-04-16 334 return 0;
ef75e73182949a arch/powerpc/kernel/signal_32.c Christophe Leroy 2020-08-18 335
ef75e73182949a arch/powerpc/kernel/signal_32.c Christophe Leroy 2020-08-18 336 failed:
ef75e73182949a arch/powerpc/kernel/signal_32.c Christophe Leroy 2020-08-18 337 return 1;
^1da177e4c3f41 arch/ppc64/kernel/signal32.c Linus Torvalds 2005-04-16 338 }
^1da177e4c3f41 arch/ppc64/kernel/signal32.c Linus Torvalds 2005-04-16 339

:::::: The code at line 297 was first introduced by commit
:::::: ec67ad82814bee92251fd963bf01c7a173856555 powerpc/signals: Improved mark VSX not saved with small contexts fix

:::::: TO: Michael Neuling <mikey@xxxxxxxxxxx>
:::::: CC: Benjamin Herrenschmidt <benh@xxxxxxxxxxxxxxxxxxx>

---
0-DAY CI Kernel Test Service, Intel Corporation
https://lists.01.org/hyperkitty/list/kbuild-all@xxxxxxxxxxxx

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