Hi Keno, Thank you for the patch! Perhaps something to improve: [auto build test WARNING on linux/master] [also build test WARNING on hnaz-mm/master linus/master v5.16-rc5 next-20211214] [If your patch is applied to the wrong git tree, kindly drop us a note. And when submitting patch, we suggest to use '--base' as documented in https://git-scm.com/docs/git-format-patch] url: https://github.com/0day-ci/linux/commits/Keno-Fischer/c-r-prctl-Remove-PR... base: https://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git 136057256686de39cc3a07c2e39ef6bc43003ff6 config: i386-randconfig-s002-20211214 (https://download.01.org/0day-ci/archive/20211216/202112160333.IwCSbqoM-lk...) compiler: gcc-9 (Debian 9.3.0-22) 9.3.0 reproduce: # apt-get install sparse # sparse version: v0.6.4-dirty # https://github.com/0day-ci/linux/commit/08f30df401c936e27733e3b37765c2b7d... git remote add linux-review https://github.com/0day-ci/linux git fetch --no-tags linux-review Keno-Fischer/c-r-prctl-Remove-PR_SET_MM_EXE_FILE-old-file-mapping-restriction/20211215-142515 git checkout 08f30df401c936e27733e3b37765c2b7d35fe0e7 # save the config file to linux build tree mkdir build_dir make W=1 C=1 CF='-fdiagnostic-prefix -D__CHECK_ENDIAN__' O=build_dir ARCH=i386 SHELL=/bin/bash If you fix the issue, kindly add following tag as appropriate Reported-by: kernel test robot <lkp(a)intel.com&gt; sparse warnings: (new ones prefixed by >>) kernel/fork.c:1215:24: sparse: sparse: incorrect type in initializer (different address spaces) @@ expected struct file [noderef] __rcu *__ret @@ got struct file *new_exe_file @@ kernel/fork.c:1215:24: sparse: expected struct file [noderef] __rcu *__ret kernel/fork.c:1215:24: sparse: got struct file *new_exe_file kernel/fork.c:1215:22: sparse: expected struct file *old_exe_file kernel/fork.c:1215:22: sparse: got struct file [noderef] __rcu *[assigned] __ret kernel/fork.c:1572:38: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct refcount_struct [usertype] *r @@ got struct refcount_struct [noderef] __rcu * @@ kernel/fork.c:1572:38: sparse: expected struct refcount_struct [usertype] *r kernel/fork.c:1572:38: sparse: got struct refcount_struct [noderef] __rcu * kernel/fork.c:1581:31: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct spinlock [usertype] *lock @@ got struct spinlock [noderef] __rcu * @@ kernel/fork.c:1581:31: sparse: expected struct spinlock [usertype] *lock kernel/fork.c:1581:31: sparse: got struct spinlock [noderef] __rcu * kernel/fork.c:1582:36: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected void const *q @@ got struct k_sigaction [noderef] __rcu * @@ kernel/fork.c:1582:36: sparse: expected void const *q kernel/fork.c:1582:36: sparse: got struct k_sigaction [noderef] __rcu * kernel/fork.c:1583:33: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct spinlock [usertype] *lock @@ got struct spinlock [noderef] __rcu * @@ kernel/fork.c:1583:33: sparse: expected struct spinlock [usertype] *lock kernel/fork.c:1583:33: sparse: got struct spinlock [noderef] __rcu * kernel/fork.c:1995:31: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct spinlock [usertype] *lock @@ got struct spinlock [noderef] __rcu * @@ kernel/fork.c:1995:31: sparse: expected struct spinlock [usertype] *lock kernel/fork.c:1995:31: sparse: got struct spinlock [noderef] __rcu * kernel/fork.c:1999:33: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct spinlock [usertype] *lock @@ got struct spinlock [noderef] __rcu * @@ kernel/fork.c:1999:33: sparse: expected struct spinlock [usertype] *lock kernel/fork.c:1999:33: sparse: got struct spinlock [noderef] __rcu * kernel/fork.c:2304:32: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct task_struct [noderef] __rcu *real_parent @@ got struct task_struct * @@ kernel/fork.c:2304:32: sparse: expected struct task_struct [noderef] __rcu *real_parent kernel/fork.c:2304:32: sparse: got struct task_struct * kernel/fork.c:2313:27: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct spinlock [usertype] *lock @@ got struct spinlock [noderef] __rcu * @@ kernel/fork.c:2313:27: sparse: expected struct spinlock [usertype] *lock kernel/fork.c:2313:27: sparse: got struct spinlock [noderef] __rcu * kernel/fork.c:2362:54: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct list_head *head @@ got struct list_head [noderef] __rcu * @@ kernel/fork.c:2362:54: sparse: expected struct list_head *head kernel/fork.c:2362:54: sparse: got struct list_head [noderef] __rcu * kernel/fork.c:2383:29: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct spinlock [usertype] *lock @@ got struct spinlock [noderef] __rcu * @@ kernel/fork.c:2383:29: sparse: expected struct spinlock [usertype] *lock kernel/fork.c:2383:29: sparse: got struct spinlock [noderef] __rcu * kernel/fork.c:2401:29: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct spinlock [usertype] *lock @@ got struct spinlock [noderef] __rcu * @@ kernel/fork.c:2401:29: sparse: expected struct spinlock [usertype] *lock kernel/fork.c:2401:29: sparse: got struct spinlock [noderef] __rcu * kernel/fork.c:2428:28: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct sighand_struct *sighand @@ got struct sighand_struct [noderef] __rcu *sighand @@ kernel/fork.c:2428:28: sparse: expected struct sighand_struct *sighand kernel/fork.c:2428:28: sparse: got struct sighand_struct [noderef] __rcu *sighand kernel/fork.c:2456:31: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct spinlock [usertype] *lock @@ got struct spinlock [noderef] __rcu * @@ kernel/fork.c:2456:31: sparse: expected struct spinlock [usertype] *lock kernel/fork.c:2456:31: sparse: got struct spinlock [noderef] __rcu * kernel/fork.c:2458:33: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct spinlock [usertype] *lock @@ got struct spinlock [noderef] __rcu * @@ kernel/fork.c:2458:33: sparse: expected struct spinlock [usertype] *lock kernel/fork.c:2458:33: sparse: got struct spinlock [noderef] __rcu * kernel/fork.c:2867:24: sparse: sparse: incorrect type in assignment (different address spaces) @@ expected struct task_struct *[assigned] parent @@ got struct task_struct [noderef] __rcu *real_parent @@ kernel/fork.c:2867:24: sparse: expected struct task_struct *[assigned] parent kernel/fork.c:2867:24: sparse: got struct task_struct [noderef] __rcu *real_parent kernel/fork.c:2948:43: sparse: sparse: incorrect type in argument 1 (different address spaces) @@ expected struct refcount_struct const [usertype] *r @@ got struct refcount_struct [noderef] __rcu * @@ kernel/fork.c:2948:43: sparse: expected struct refcount_struct const [usertype] *r kernel/fork.c:2948:43: sparse: got struct refcount_struct [noderef] __rcu * kernel/fork.c:2039:22: sparse: sparse: dereference of noderef expression kernel/fork.c: note: in included file (through include/uapi/asm-generic/bpf_perf_event.h, arch/x86/include/generated/uapi/asm/bpf_perf_event.h, ...): include/linux/ptrace.h:218:45: sparse: sparse: incorrect type in argument 2 (different address spaces) @@ expected struct task_struct *new_parent @@ got struct task_struct [noderef] __rcu *parent @@ include/linux/ptrace.h:218:45: sparse: expected struct task_struct *new_parent include/linux/ptrace.h:218:45: sparse: got struct task_struct [noderef] __rcu *parent include/linux/ptrace.h:218:62: sparse: sparse: incorrect type in argument 3 (different address spaces) @@ expected struct cred const *ptracer_cred @@ got struct cred const [noderef] __rcu *ptracer_cred @@ include/linux/ptrace.h:218:62: sparse: expected struct cred const *ptracer_cred include/linux/ptrace.h:218:62: sparse: got struct cred const [noderef] __rcu *ptracer_cred kernel/fork.c:2360:59: sparse: sparse: dereference of noderef expression kernel/fork.c:2361:59: sparse: sparse: dereference of noderef expression vim +1215 kernel/fork.c 3864601387cf41 Jiri Slaby 2011-05-26 1194 35d7bdc86031a2 David Hildenbrand 2021-04-23 1195 /** 35d7bdc86031a2 David Hildenbrand 2021-04-23 1196 * replace_mm_exe_file - replace a reference to the mm's executable file 35d7bdc86031a2 David Hildenbrand 2021-04-23 1197 * 35d7bdc86031a2 David Hildenbrand 2021-04-23 1198 * This changes mm's executable file (shown as symlink /proc/[pid]/exe), 35d7bdc86031a2 David Hildenbrand 2021-04-23 1199 * dealing with concurrent invocation and without grabbing the mmap lock in 35d7bdc86031a2 David Hildenbrand 2021-04-23 1200 * write mode. 35d7bdc86031a2 David Hildenbrand 2021-04-23 1201 * 35d7bdc86031a2 David Hildenbrand 2021-04-23 1202 * Main user is sys_prctl(PR_SET_MM_MAP/EXE_FILE). 35d7bdc86031a2 David Hildenbrand 2021-04-23 1203 */ 35d7bdc86031a2 David Hildenbrand 2021-04-23 1204 int replace_mm_exe_file(struct mm_struct *mm, struct file *new_exe_file) 35d7bdc86031a2 David Hildenbrand 2021-04-23 1205 { 35d7bdc86031a2 David Hildenbrand 2021-04-23 1206 struct file *old_exe_file; 35d7bdc86031a2 David Hildenbrand 2021-04-23 1207 int ret = 0; 35d7bdc86031a2 David Hildenbrand 2021-04-23 1208 35d7bdc86031a2 David Hildenbrand 2021-04-23 1209 /* set the new file, lockless */ fe69d560b5bd9e David Hildenbrand 2021-04-23 1210 ret = deny_write_access(new_exe_file); fe69d560b5bd9e David Hildenbrand 2021-04-23 1211 if (ret) fe69d560b5bd9e David Hildenbrand 2021-04-23 1212 return -EACCES; 35d7bdc86031a2 David Hildenbrand 2021-04-23 1213 get_file(new_exe_file); fe69d560b5bd9e David Hildenbrand 2021-04-23 1214 35d7bdc86031a2 David Hildenbrand 2021-04-23 @1215 old_exe_file = xchg(&mm->exe_file, new_exe_file); fe69d560b5bd9e David Hildenbrand 2021-04-23 1216 if (old_exe_file) { fe69d560b5bd9e David Hildenbrand 2021-04-23 1217 /* fe69d560b5bd9e David Hildenbrand 2021-04-23 1218 * Don't race with dup_mmap() getting the file and disallowing fe69d560b5bd9e David Hildenbrand 2021-04-23 1219 * write access while someone might open the file writable. fe69d560b5bd9e David Hildenbrand 2021-04-23 1220 */ fe69d560b5bd9e David Hildenbrand 2021-04-23 1221 mmap_read_lock(mm); fe69d560b5bd9e David Hildenbrand 2021-04-23 1222 allow_write_access(old_exe_file); 35d7bdc86031a2 David Hildenbrand 2021-04-23 1223 fput(old_exe_file); fe69d560b5bd9e David Hildenbrand 2021-04-23 1224 mmap_read_unlock(mm); fe69d560b5bd9e David Hildenbrand 2021-04-23 1225 } 35d7bdc86031a2 David Hildenbrand 2021-04-23 1226 return 0; 35d7bdc86031a2 David Hildenbrand 2021-04-23 1227 } 3864601387cf41 Jiri Slaby 2011-05-26 1228 --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org