:::::: :::::: Manual check reason: "low confidence static check warning: arch/x86/kernel/traps.c:533:24: warning: Value stored to 't' during its initialization is never read [clang-analyzer-deadcode.DeadStores]" ::::::
CC: [email protected] CC: [email protected] BCC: [email protected] CC: [email protected] TO: Peter Zijlstra <[email protected]> CC: Thomas Gleixner <[email protected]> tree: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git master head: 58f9d52ff689a262bec7f5713c07f5a79e115168 commit: b968e84b509da593c50dc3db679e1d33de701f78 x86/iopl: Fake iopl(3) CLI/STI usage date: 9 months ago :::::: branch date: 6 hours ago :::::: commit date: 9 months ago config: x86_64-randconfig-c007-20220530 (https://download.01.org/0day-ci/archive/20220603/[email protected]/config) compiler: clang version 15.0.0 (https://github.com/llvm/llvm-project 0776c48f9b7e69fa447bee57c7c0985caa856be9) 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 # https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git/commit/?id=b968e84b509da593c50dc3db679e1d33de701f78 git remote add linus https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git git fetch --no-tags linus master git checkout b968e84b509da593c50dc3db679e1d33de701f78 # save the config file COMPILER_INSTALL_PATH=$HOME/0day COMPILER=clang make.cross ARCH=x86_64 clang-analyzer If you fix the issue, kindly add following tag where applicable Reported-by: kernel test robot <[email protected]> clang-analyzer warnings: (new ones prefixed by >>) include/asm-generic/bug.h:100:3: note: expanded from macro '__WARN_printf' __WARN_FLAGS(BUGFLAG_NO_CUT_HERE | BUGFLAG_TAINT(taint));\ ^ arch/x86/include/asm/bug.h:76:33: note: expanded from macro '__WARN_FLAGS' #define __WARN_FLAGS(flags) \ ^ lib/math/reciprocal_div.c:47:2: note: Loop condition is false. Exiting loop WARN(l == 32, ^ include/asm-generic/bug.h:132:3: note: expanded from macro 'WARN' __WARN_printf(TAINT_WARN, format); \ ^ include/asm-generic/bug.h:101:3: note: expanded from macro '__WARN_printf' instrumentation_end(); \ ^ include/linux/instrumentation.h:58:33: note: expanded from macro 'instrumentation_end' # define instrumentation_end() do { } while(0) ^ lib/math/reciprocal_div.c:47:2: note: Loop condition is false. Exiting loop WARN(l == 32, ^ include/asm-generic/bug.h:132:3: note: expanded from macro 'WARN' __WARN_printf(TAINT_WARN, format); \ ^ include/asm-generic/bug.h:97:38: note: expanded from macro '__WARN_printf' #define __WARN_printf(taint, arg...) do { \ ^ lib/math/reciprocal_div.c:51:14: note: The result of the left shift is undefined due to shifting by '64', which is greater or equal to the width of type 'unsigned long long' mlow = 1ULL << (32 + l); ^ ~~~~~~~~ 7 warnings generated. arch/x86/crypto/blowfish_glue.c:159:10: warning: Although the value stored to 'nbytes' is used in the enclosing expression, the value is never actually read from 'nbytes' [clang-analyzer-deadcode.DeadStores] while ((nbytes = walk.nbytes)) { ^ ~~~~~~~~~~~ arch/x86/crypto/blowfish_glue.c:159:10: note: Although the value stored to 'nbytes' is used in the enclosing expression, the value is never actually read from 'nbytes' while ((nbytes = walk.nbytes)) { ^ ~~~~~~~~~~~ arch/x86/crypto/blowfish_glue.c:240:10: warning: Although the value stored to 'nbytes' is used in the enclosing expression, the value is never actually read from 'nbytes' [clang-analyzer-deadcode.DeadStores] while ((nbytes = walk.nbytes)) { ^ ~~~~~~~~~~~ arch/x86/crypto/blowfish_glue.c:240:10: note: Although the value stored to 'nbytes' is used in the enclosing expression, the value is never actually read from 'nbytes' while ((nbytes = walk.nbytes)) { ^ ~~~~~~~~~~~ Suppressed 5 warnings (3 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. 3 warnings generated. Suppressed 3 warnings (3 in non-user code). 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. Suppressed 4 warnings (4 in non-user code). 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. Suppressed 3 warnings (3 in non-user code). 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. Suppressed 3 warnings (3 in non-user code). 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. Suppressed 3 warnings (3 in non-user code). 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. Suppressed 3 warnings (3 in non-user code). 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. Suppressed 3 warnings (3 in non-user code). 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. Suppressed 3 warnings (3 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 9 warnings generated. Suppressed 9 warnings (9 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 9 warnings generated. Suppressed 9 warnings (9 in non-user code). 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. Suppressed 4 warnings (4 in non-user code). 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. Suppressed 4 warnings (4 in non-user code). 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. Suppressed 3 warnings (3 in non-user code). 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. Suppressed 4 warnings (4 in non-user code). 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. Suppressed 3 warnings (3 in non-user code). 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. Suppressed 4 warnings (4 in non-user code). 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. Suppressed 5 warnings (5 in non-user code). 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. Suppressed 3 warnings (3 in non-user code). 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. >> arch/x86/kernel/traps.c:533:24: warning: Value stored to 't' during its >> initialization is never read [clang-analyzer-deadcode.DeadStores] struct thread_struct *t = ¤t->thread; ^ ~~~~~~~~~~~~~~~~ arch/x86/kernel/traps.c:533:24: note: Value stored to 't' during its initialization is never read struct thread_struct *t = ¤t->thread; ^ ~~~~~~~~~~~~~~~~ Suppressed 5 warnings (5 in non-user code). 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. Suppressed 5 warnings (5 in non-user code). 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. Suppressed 5 warnings (5 in non-user code). 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. Suppressed 4 warnings (4 in non-user code). 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. Suppressed 4 warnings (4 in non-user code). 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 (2 in non-user code). 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. Suppressed 4 warnings (4 in non-user code). 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. Suppressed 4 warnings (4 in non-user code). 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. Suppressed 3 warnings (3 in non-user code). 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 (2 in non-user code). Use -header-filter=.* to display errors from all non-system headers. Use -system-headers to display errors from system headers as well. 9 warnings generated. Suppressed 9 warnings (9 in non-user code). 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. Suppressed 4 warnings (4 in non-user code). 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. fs/jffs2/nodemgmt.c:516:47: warning: Access to field 'offset' results in a dereference of a null pointer (loaded from variable 'jeb') [clang-analyzer-core.NullDereference] && (jeb != c->nextblock || (ofs & ~3) != jeb->offset + (c->sector_size - jeb->free_size))) { ^~~ fs/jffs2/nodemgmt.c:507:2: note: Value assigned to 'jeb' jeb = &c->blocks[ofs / c->sector_size]; ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ fs/jffs2/nodemgmt.c:509:2: note: 0 is < 1 jffs2_dbg(1, "%s(): Node at 0x%x(%d), size 0x%x\n", ^ fs/jffs2/debug.h:69:6: note: expanded from macro 'jffs2_dbg' if (CONFIG_JFFS2_FS_DEBUG >= level) \ ^~~~~~~~~~~~~~~~~~~~~ ./include/generated/autoconf.h:748:31: note: expanded from macro 'CONFIG_JFFS2_FS_DEBUG' #define CONFIG_JFFS2_FS_DEBUG 0 ^ fs/jffs2/nodemgmt.c:509:2: note: Taking false branch jffs2_dbg(1, "%s(): Node at 0x%x(%d), size 0x%x\n", ^ fs/jffs2/debug.h:69:2: note: expanded from macro 'jffs2_dbg' if (CONFIG_JFFS2_FS_DEBUG >= level) \ ^ fs/jffs2/nodemgmt.c:509:2: note: Loop condition is false. Exiting loop jffs2_dbg(1, "%s(): Node at 0x%x(%d), size 0x%x\n", ^ fs/jffs2/debug.h:67:37: note: expanded from macro 'jffs2_dbg' #define jffs2_dbg(level, fmt, ...) \ ^ fs/jffs2/nodemgmt.c:515:7: note: Assuming field 'nextblock' is null if ((c->nextblock || ((ofs & 3) != REF_OBSOLETE)) ^~~~~~~~~~~~ fs/jffs2/nodemgmt.c:515:7: note: Left side of '||' is false fs/jffs2/nodemgmt.c:515:24: note: Assuming the condition is true if ((c->nextblock || ((ofs & 3) != REF_OBSOLETE)) ^~~~~~~~~~~~~~~~~~~~~~~~~ fs/jffs2/nodemgmt.c:515:6: note: Left side of '&&' is true if ((c->nextblock || ((ofs & 3) != REF_OBSOLETE)) ^ fs/jffs2/nodemgmt.c:516:10: note: Assuming 'jeb' is equal to field 'nextblock' && (jeb != c->nextblock || (ofs & ~3) != jeb->offset + (c->sector_size - jeb->free_size))) { ^~~~~~~~~~~~~~~~~~~ fs/jffs2/nodemgmt.c:516:10: note: Left side of '||' is false fs/jffs2/nodemgmt.c:516:47: note: Access to field 'offset' results in a dereference of a null pointer (loaded from variable 'jeb') && (jeb != c->nextblock || (ofs & ~3) != jeb->offset + (c->sector_size - jeb->free_size))) { ^~~ Suppressed 4 warnings (4 in non-user code). 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. Suppressed 4 warnings (4 in non-user code). 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. kernel/time/clocksource.c:684:2: warning: Dereference of null pointer [clang-analyzer-core.NullDereference] list_for_each_entry(cs, &clocksource_list, list) { ^ include/linux/list.h:630:13: note: expanded from macro 'list_for_each_entry' pos = list_next_entry(pos, member)) ^ include/linux/list.h:555:2: note: expanded from macro 'list_next_entry' list_entry((pos)->member.next, typeof(*(pos)), member) ^ -- ^~~~~~~~~~~~~~~~~~ fs/ntfs3/attrib.c:1570:3: note: Taking false branch if (next_svcn == evcn1) { ^ fs/ntfs3/attrib.c:1575:7: note: Assuming field 'size' is 0 if (!ni->attr_list.size) { ^~~~~~~~~~~~~~~~~~~ fs/ntfs3/attrib.c:1575:3: note: Taking true branch if (!ni->attr_list.size) { ^ fs/ntfs3/attrib.c:1577:8: note: Assuming 'err' is 0 if (err) ^~~ fs/ntfs3/attrib.c:1577:4: note: Taking false branch if (err) ^ fs/ntfs3/attrib.c:1581:4: note: Value assigned to 'attr_b' attr_b = ni_find_attr(ni, NULL, &le_b, ATTR_DATA, NULL, ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ fs/ntfs3/attrib.c:1583:8: note: Assuming 'attr_b' is null if (!attr_b) { ^~~~~~~ fs/ntfs3/attrib.c:1583:4: note: Taking true branch if (!attr_b) { ^ fs/ntfs3/attrib.c:1585:5: note: Control jumps to line 1667 goto out; ^ fs/ntfs3/attrib.c:1667:6: note: Assuming 'new_valid' is <= 'data_size' if (new_valid > data_size) ^~~~~~~~~~~~~~~~~~~~~ fs/ntfs3/attrib.c:1667:2: note: Taking false branch if (new_valid > data_size) ^ fs/ntfs3/attrib.c:1670:15: note: Dereference of null pointer valid_size = le64_to_cpu(attr_b->nres.valid_size); ^ include/linux/byteorder/generic.h:87:21: note: expanded from macro 'le64_to_cpu' #define le64_to_cpu __le64_to_cpu ^ include/uapi/linux/byteorder/little_endian.h:32:50: note: expanded from macro '__le64_to_cpu' #define __le64_to_cpu(x) ((__force __u64)(__le64)(x)) ^~~ fs/ntfs3/attrib.c:1962:19: warning: Dereference of null pointer [clang-analyzer-core.NullDereference] u32 data_size = le32_to_cpu(attr->res.data_size); ^ include/linux/byteorder/generic.h:89:21: note: expanded from macro 'le32_to_cpu' #define le32_to_cpu __le32_to_cpu ^ include/uapi/linux/byteorder/little_endian.h:34:50: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) ((__force __u32)(__le32)(x)) ^~~ fs/ntfs3/attrib.c:1946:17: note: 'attr' initialized to a null pointer value struct ATTRIB *attr = NULL, *attr_b; ^~~~ fs/ntfs3/attrib.c:1953:6: note: Assuming 'bytes' is not equal to 0 if (!bytes) ^~~~~~ fs/ntfs3/attrib.c:1953:2: note: Taking false branch if (!bytes) ^ fs/ntfs3/attrib.c:1958:6: note: Assuming 'attr_b' is non-null if (!attr_b) ^~~~~~~ fs/ntfs3/attrib.c:1958:2: note: Taking false branch if (!attr_b) ^ fs/ntfs3/attrib.c:1961:6: note: Assuming field 'non_res' is 0 if (!attr_b->non_res) { ^~~~~~~~~~~~~~~~ fs/ntfs3/attrib.c:1961:2: note: Taking true branch if (!attr_b->non_res) { ^ fs/ntfs3/attrib.c:1962:19: note: Dereference of null pointer u32 data_size = le32_to_cpu(attr->res.data_size); ^ include/linux/byteorder/generic.h:89:21: note: expanded from macro 'le32_to_cpu' #define le32_to_cpu __le32_to_cpu ^ include/uapi/linux/byteorder/little_endian.h:34:50: note: expanded from macro '__le32_to_cpu' #define __le32_to_cpu(x) ((__force __u32)(__le32)(x)) ^~~ Suppressed 5 warnings (4 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. 4 warnings generated. Suppressed 4 warnings (4 in non-user code). 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. Suppressed 3 warnings (3 in non-user code). 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. Suppressed 4 warnings (4 in non-user code). 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. Suppressed 5 warnings (5 in non-user code). 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. Suppressed 3 warnings (3 in non-user code). 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. >> arch/x86/kernel/traps.c:533:24: warning: Value stored to 't' during its >> initialization is never read [clang-analyzer-deadcode.DeadStores] struct thread_struct *t = ¤t->thread; ^ ~~~~~~~~~~~~~~~~ arch/x86/kernel/traps.c:533:24: note: Value stored to 't' during its initialization is never read struct thread_struct *t = ¤t->thread; ^ ~~~~~~~~~~~~~~~~ Suppressed 5 warnings (5 in non-user code). 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. Suppressed 5 warnings (5 in non-user code). 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. Suppressed 5 warnings (5 in non-user code). 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. Suppressed 4 warnings (4 in non-user code). 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. Suppressed 4 warnings (4 in non-user code). 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 (2 in non-user code). 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. Suppressed 4 warnings (4 in non-user code). 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. Suppressed 4 warnings (4 in non-user code). 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. Suppressed 3 warnings (3 in non-user code). 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. Suppressed 4 warnings (4 in non-user code). 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. Suppressed 3 warnings (3 in non-user code). 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. Suppressed 3 warnings (3 in non-user code). 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. Suppressed 4 warnings (4 in non-user code). 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. Suppressed 4 warnings (4 in non-user code). 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. Suppressed 4 warnings (4 in non-user code). 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. include/linux/list.h:70:13: warning: Access to field 'prev' results in a dereference of a null pointer (loaded from variable 'next') [clang-analyzer-core.NullDereference] next->prev = new; ^ mm/zsmalloc.c:2293:25: note: Left side of '&&' is false struct zs_pool *pool = container_of(shrinker, struct zs_pool, ^ include/linux/kernel.h:495:61: note: expanded from macro 'container_of' BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \ ^ mm/zsmalloc.c:2293:25: note: Taking false branch struct zs_pool *pool = container_of(shrinker, struct zs_pool, ^ include/linux/kernel.h:495:2: note: expanded from macro 'container_of' BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \ ^ include/linux/build_bug.h:39:37: note: expanded from macro 'BUILD_BUG_ON_MSG' #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) ^ include/linux/compiler_types.h:322:2: note: expanded from macro 'compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^ include/linux/compiler_types.h:310:2: note: expanded from macro '_compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^ include/linux/compiler_types.h:302:3: note: expanded from macro '__compiletime_assert' if (!(condition)) \ ^ mm/zsmalloc.c:2293:25: note: Loop condition is false. Exiting loop struct zs_pool *pool = container_of(shrinker, struct zs_pool, ^ include/linux/kernel.h:495:2: note: expanded from macro 'container_of' BUILD_BUG_ON_MSG(!__same_type(*(ptr), ((type *)0)->member) && \ ^ include/linux/build_bug.h:39:37: note: expanded from macro 'BUILD_BUG_ON_MSG' #define BUILD_BUG_ON_MSG(cond, msg) compiletime_assert(!(cond), msg) ^ include/linux/compiler_types.h:322:2: note: expanded from macro 'compiletime_assert' _compiletime_assert(condition, msg, __compiletime_assert_, __COUNTER__) ^ include/linux/compiler_types.h:310:2: note: expanded from macro '_compiletime_assert' __compiletime_assert(condition, msg, prefix, suffix) ^ include/linux/compiler_types.h:300:2: note: expanded from macro '__compiletime_assert' do { \ ^ mm/zsmalloc.c:2301:16: note: Calling 'zs_compact' pages_freed = zs_compact(pool); ^~~~~~~~~~~~~~~~ mm/zsmalloc.c:2269:11: note: '?' condition is true for (i = ZS_SIZE_CLASSES - 1; i >= 0; i--) { vim +/t +533 arch/x86/kernel/traps.c 59c1dcbed5b51c Jann Horn 2019-12-19 530 b968e84b509da5 Peter Zijlstra 2021-09-17 531 static bool fixup_iopl_exception(struct pt_regs *regs) b968e84b509da5 Peter Zijlstra 2021-09-17 532 { b968e84b509da5 Peter Zijlstra 2021-09-17 @533 struct thread_struct *t = ¤t->thread; b968e84b509da5 Peter Zijlstra 2021-09-17 534 unsigned char byte; b968e84b509da5 Peter Zijlstra 2021-09-17 535 unsigned long ip; b968e84b509da5 Peter Zijlstra 2021-09-17 536 b968e84b509da5 Peter Zijlstra 2021-09-17 537 if (!IS_ENABLED(CONFIG_X86_IOPL_IOPERM) || t->iopl_emul != 3) b968e84b509da5 Peter Zijlstra 2021-09-17 538 return false; b968e84b509da5 Peter Zijlstra 2021-09-17 539 b968e84b509da5 Peter Zijlstra 2021-09-17 540 if (insn_get_effective_ip(regs, &ip)) b968e84b509da5 Peter Zijlstra 2021-09-17 541 return false; b968e84b509da5 Peter Zijlstra 2021-09-17 542 b968e84b509da5 Peter Zijlstra 2021-09-17 543 if (get_user(byte, (const char __user *)ip)) b968e84b509da5 Peter Zijlstra 2021-09-17 544 return false; b968e84b509da5 Peter Zijlstra 2021-09-17 545 b968e84b509da5 Peter Zijlstra 2021-09-17 546 if (byte != 0xfa && byte != 0xfb) b968e84b509da5 Peter Zijlstra 2021-09-17 547 return false; b968e84b509da5 Peter Zijlstra 2021-09-17 548 b968e84b509da5 Peter Zijlstra 2021-09-17 549 if (!t->iopl_warn && printk_ratelimit()) { b968e84b509da5 Peter Zijlstra 2021-09-17 550 pr_err("%s[%d] attempts to use CLI/STI, pretending it's a NOP, ip:%lx", b968e84b509da5 Peter Zijlstra 2021-09-17 551 current->comm, task_pid_nr(current), ip); b968e84b509da5 Peter Zijlstra 2021-09-17 552 print_vma_addr(KERN_CONT " in ", ip); b968e84b509da5 Peter Zijlstra 2021-09-17 553 pr_cont("\n"); b968e84b509da5 Peter Zijlstra 2021-09-17 554 t->iopl_warn = 1; b968e84b509da5 Peter Zijlstra 2021-09-17 555 } b968e84b509da5 Peter Zijlstra 2021-09-17 556 b968e84b509da5 Peter Zijlstra 2021-09-17 557 regs->ip += 1; b968e84b509da5 Peter Zijlstra 2021-09-17 558 return true; b968e84b509da5 Peter Zijlstra 2021-09-17 559 } b968e84b509da5 Peter Zijlstra 2021-09-17 560 -- 0-DAY CI Kernel Test Service https://01.org/lkp _______________________________________________ kbuild mailing list -- [email protected] To unsubscribe send an email to [email protected]
