tree: https://gitee.com/openeuler/kernel.git openEuler-1.0-LTS head: ff773a407598b9c693c9dc10e0dc587828127aa6 commit: 71e217e85c3dff8a9151707ed3afc7b4b054a2d4 [5421/22098] selinux: use kernel linux/socket.h for genheaders and mdp config: arm64-randconfig-002-20240415 (https://download.01.org/0day-ci/archive/20240415/202404151325.D66sRhzh-lkp@i...) compiler: aarch64-linux-gcc (GCC) 13.2.0 reproduce (this is a W=1 build): (https://download.01.org/0day-ci/archive/20240415/202404151325.D66sRhzh-lkp@i...) If you fix the issue in a separate patch/commit (i.e. not just a new version of the same patch/commit), kindly add following tags | Reported-by: kernel test robot <lkp@intel.com> | Closes: https://lore.kernel.org/oe-kbuild-all/202404151325.D66sRhzh-lkp@intel.com/ Note: it may well be a FALSE warning. FWIW you are at least aware of it now. http://gcc.gnu.org/wiki/Better_Uninitialized_Warnings All warnings (new ones prefixed by >>): In file included from drivers/net/tun.c:53: In function '__skb_queue_splice', inlined from 'skb_queue_splice_tail_init' at include/linux/skbuff.h:1801:3, inlined from 'tun_napi_receive' at drivers/net/tun.c:287:2: include/linux/skbuff.h:1741:20: warning: array subscript 'struct sk_buff[0]' is partly outside array bounds of 'struct sk_buff_head[1]' [-Warray-bounds=] 1741 | next->prev = last; | ~~~~~~~~~~~^~~~~~ drivers/net/tun.c: In function 'tun_napi_receive': drivers/net/tun.c:280:29: note: object 'process_queue' of size 24 280 | struct sk_buff_head process_queue; | ^~~~~~~~~~~~~ In file included from include/linux/poll.h:12, from drivers/net/tun.c:50: In function '_copy_from_user', inlined from 'copy_from_user' at include/linux/uaccess.h:144:7, inlined from 'update_filter' at drivers/net/tun.c:923:6:

...

include/linux/uaccess.h:112:17: warning: 'uf' may be used uninitialized [-Wmaybe-uninitialized] 112 | kasan_check_write(to, n); | ^~~~~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/compiler.h:251, from include/linux/kernel.h:10, from include/linux/list.h:9, from include/linux/module.h:10, from drivers/net/tun.c:44: include/linux/kasan-checks.h: In function 'update_filter': include/linux/kasan-checks.h:7:6: note: by argument 1 of type 'const volatile void *' to 'kasan_check_write' declared here 7 | void kasan_check_write(const volatile void *p, unsigned int size); | ^~~~~~~~~~~~~~~~~ drivers/net/tun.c:920:27: note: 'uf' declared here 920 | struct tun_filter uf; | ^~ In function '_copy_from_user', inlined from 'copy_from_user' at include/linux/uaccess.h:144:7, inlined from 'tun_set_ebpf' at drivers/net/tun.c:2825:6: include/linux/uaccess.h:112:17: warning: 'fd' may be used uninitialized [-Wmaybe-uninitialized] 112 | kasan_check_write(to, n); | ^~~~~~~~~~~~~~~~~~~~~~~~ include/linux/kasan-checks.h: In function 'tun_set_ebpf': include/linux/kasan-checks.h:7:6: note: by argument 1 of type 'const volatile void *' to 'kasan_check_write' declared here 7 | void kasan_check_write(const volatile void *p, unsigned int size); | ^~~~~~~~~~~~~~~~~ drivers/net/tun.c:2823:13: note: 'fd' declared here 2823 | int fd; | ^~ In function '__skb_queue_splice', inlined from 'skb_queue_splice_tail_init' at include/linux/skbuff.h:1801:3, inlined from 'tun_rx_batched.isra' at drivers/net/tun.c:1538:3: include/linux/skbuff.h:1738:20: warning: array subscript 'struct sk_buff[0]' is partly outside array bounds of 'struct sk_buff_head[1]' [-Warray-bounds=] 1738 | prev->next = first; | ~~~~~~~~~~~^~~~~~~ drivers/net/tun.c: In function 'tun_rx_batched.isra': drivers/net/tun.c:1523:29: note: object 'process_queue' of size 24 1523 | struct sk_buff_head process_queue; | ^~~~~~~~~~~~~ In function '__skb_queue_splice', inlined from 'skb_queue_splice_tail_init' at include/linux/skbuff.h:1801:3, inlined from 'tun_rx_batched.isra' at drivers/net/tun.c:1538:3: include/linux/skbuff.h:1741:20: warning: array subscript 'struct sk_buff[0]' is partly outside array bounds of 'struct sk_buff_head[1]' [-Warray-bounds=] 1741 | next->prev = last; | ~~~~~~~~~~~^~~~~~ drivers/net/tun.c: In function 'tun_rx_batched.isra': drivers/net/tun.c:1523:29: note: object 'process_queue' of size 24 1523 | struct sk_buff_head process_queue; | ^~~~~~~~~~~~~ In file included from drivers/net/tun.c:54: In function 'rps_record_sock_flow', inlined from 'sock_rps_record_flow_hash' at include/net/sock.h:977:2, inlined from 'tun_flow_update' at drivers/net/tun.c:540:3: include/linux/netdevice.h:717:32: warning: array subscript index is outside array bounds of 'u32[0]' {aka 'unsigned int[]'} [-Warray-bounds=] 717 | if (table->ents[index] != val) | ~~~~~~~~~~~^~~~~~~ include/linux/netdevice.h: In function 'tun_flow_update': include/linux/netdevice.h:698:17: note: while referencing 'ents' 698 | u32 ents[0] ____cacheline_aligned_in_smp; | ^~~~ In function 'rps_record_sock_flow', inlined from 'sock_rps_record_flow_hash' at include/net/sock.h:977:2, inlined from 'tun_flow_update' at drivers/net/tun.c:540:3: include/linux/netdevice.h:718:36: warning: array subscript index is outside array bounds of 'u32[0]' {aka 'unsigned int[]'} [-Warray-bounds=] 718 | table->ents[index] = val; | ~~~~~~~~~~~^~~~~~~ include/linux/netdevice.h: In function 'tun_flow_update': include/linux/netdevice.h:698:17: note: while referencing 'ents' 698 | u32 ents[0] ____cacheline_aligned_in_smp; | ^~~~ In file included from include/asm-generic/preempt.h:5, from ./arch/arm64/include/generated/asm/preempt.h:1, from include/linux/preempt.h:81, from include/linux/rcupdate.h:40, from include/linux/rculist.h:11, from include/linux/pid.h:5, from include/linux/sched.h:14, from arch/arm64/include/asm/compat.h:25, from arch/arm64/include/asm/stat.h:24, from include/linux/stat.h:6, from include/linux/module.h:11: In function 'check_object_size', inlined from 'check_copy_size' at include/linux/thread_info.h:150:2, inlined from 'copy_from_user' at include/linux/uaccess.h:143:6, inlined from '__tun_chr_ioctl' at drivers/net/tun.c:2858:7: include/linux/thread_info.h:119:17: warning: 'ifr' may be used uninitialized [-Wmaybe-uninitialized] 119 | __check_object_size(ptr, n, to_user); | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ include/linux/thread_info.h: In function '__tun_chr_ioctl': include/linux/thread_info.h:112:13: note: by argument 1 of type 'const void *' to '__check_object_size' declared here 112 | extern void __check_object_size(const void *ptr, unsigned long n, | ^~~~~~~~~~~~~~~~~~~ drivers/net/tun.c:2846:22: note: 'ifr' declared here 2846 | struct ifreq ifr; | ^~~ drivers/net/tun.c:561: warning: Function parameter or member 'e' not described in 'tun_flow_save_rps_rxhash' drivers/net/tun.c:561: warning: Function parameter or member 'hash' not described in 'tun_flow_save_rps_rxhash' -- from net/bridge/netfilter/ebtables.c:21: In function '_copy_from_user', inlined from 'copy_from_user' at include/linux/uaccess.h:144:7, inlined from 'compat_copy_ebt_replace_from_user' at net/bridge/netfilter/ebtables.c:2175:6: include/linux/uaccess.h:112:17: warning: 'tmp' may be used uninitialized [-Wmaybe-uninitialized] 112 | kasan_check_write(to, n); | ^~~~~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/compiler.h:251, from include/asm-generic/bug.h:5, from arch/arm64/include/asm/bug.h:37, from include/linux/bug.h:5, from include/linux/mmdebug.h:5, from include/linux/gfp.h:5, from include/linux/umh.h:4, from include/linux/kmod.h:22, from net/bridge/netfilter/ebtables.c:18: include/linux/kasan-checks.h: In function 'compat_copy_ebt_replace_from_user': include/linux/kasan-checks.h:7:6: note: by argument 1 of type 'const volatile void *' to 'kasan_check_write' declared here 7 | void kasan_check_write(const volatile void *p, unsigned int size); | ^~~~~~~~~~~~~~~~~ net/bridge/netfilter/ebtables.c:2169:35: note: 'tmp' declared here 2169 | struct compat_ebt_replace tmp; | ^~~ In function '_copy_from_user', inlined from 'copy_from_user' at include/linux/uaccess.h:144:7, inlined from 'copy_everything_to_user' at net/bridge/netfilter/ebtables.c:1444:6: include/linux/uaccess.h:112:17: warning: 'tmp' may be used uninitialized [-Wmaybe-uninitialized] 112 | kasan_check_write(to, n); | ^~~~~~~~~~~~~~~~~~~~~~~~ include/linux/kasan-checks.h: In function 'copy_everything_to_user': include/linux/kasan-checks.h:7:6: note: by argument 1 of type 'const volatile void *' to 'kasan_check_write' declared here 7 | void kasan_check_write(const volatile void *p, unsigned int size); | ^~~~~~~~~~~~~~~~~ net/bridge/netfilter/ebtables.c:1426:28: note: 'tmp' declared here 1426 | struct ebt_replace tmp; | ^~~ In function '_copy_from_user', inlined from 'copy_from_user' at include/linux/uaccess.h:144:7, inlined from 'do_replace' at net/bridge/netfilter/ebtables.c:1083:6: include/linux/uaccess.h:112:17: warning: 'tmp' may be used uninitialized [-Wmaybe-uninitialized] 112 | kasan_check_write(to, n); | ^~~~~~~~~~~~~~~~~~~~~~~~ include/linux/kasan-checks.h: In function 'do_replace': include/linux/kasan-checks.h:7:6: note: by argument 1 of type 'const volatile void *' to 'kasan_check_write' declared here 7 | void kasan_check_write(const volatile void *p, unsigned int size); | ^~~~~~~~~~~~~~~~~ net/bridge/netfilter/ebtables.c:1081:28: note: 'tmp' declared here 1081 | struct ebt_replace tmp; | ^~~ In function '_copy_from_user', inlined from 'copy_from_user' at include/linux/uaccess.h:144:7, inlined from 'compat_copy_everything_to_user' at net/bridge/netfilter/ebtables.c:1824:6: include/linux/uaccess.h:112:17: warning: 'tmp' may be used uninitialized [-Wmaybe-uninitialized] 112 | kasan_check_write(to, n); | ^~~~~~~~~~~~~~~~~~~~~~~~ include/linux/kasan-checks.h: In function 'compat_copy_everything_to_user': include/linux/kasan-checks.h:7:6: note: by argument 1 of type 'const volatile void *' to 'kasan_check_write' declared here 7 | void kasan_check_write(const volatile void *p, unsigned int size); | ^~~~~~~~~~~~~~~~~ net/bridge/netfilter/ebtables.c:1804:41: note: 'tmp' declared here 1804 | struct compat_ebt_replace repl, tmp; | ^~~ In file included from include/linux/netfilter/x_tables.h:9: net/bridge/netfilter/ebtables.c: In function 'do_update_counters.isra': net/bridge/netfilter/ebtables.c:1292:49: warning: array subscript i is outside array bounds of 'struct ebt_counter[0]' [-Warray-bounds=] 1292 | ADD_COUNTER(t->private->counters[i], tmp[i].pcnt, tmp[i].bcnt); include/uapi/linux/netfilter/x_tables.h:108:34: note: in definition of macro 'ADD_COUNTER' 108 | #define ADD_COUNTER(c,b,p) do { (c).bcnt += (b); (c).pcnt += (p); } while(0) | ^ In file included from net/bridge/netfilter/ebtables.c:22: include/linux/netfilter_bridge/ebtables.h:88:28: note: while referencing 'counters' 88 | struct ebt_counter counters[0] ____cacheline_aligned; | ^~~~~~~~ net/bridge/netfilter/ebtables.c:1292:49: warning: array subscript i is outside array bounds of 'struct ebt_counter[0]' [-Warray-bounds=] 1292 | ADD_COUNTER(t->private->counters[i], tmp[i].pcnt, tmp[i].bcnt); include/uapi/linux/netfilter/x_tables.h:108:34: note: in definition of macro 'ADD_COUNTER' 108 | #define ADD_COUNTER(c,b,p) do { (c).bcnt += (b); (c).pcnt += (p); } while(0) | ^ include/linux/netfilter_bridge/ebtables.h:88:28: note: while referencing 'counters' 88 | struct ebt_counter counters[0] ____cacheline_aligned; | ^~~~~~~~ net/bridge/netfilter/ebtables.c:1292:49: warning: array subscript i is outside array bounds of 'struct ebt_counter[0]' [-Warray-bounds=] 1292 | ADD_COUNTER(t->private->counters[i], tmp[i].pcnt, tmp[i].bcnt); include/uapi/linux/netfilter/x_tables.h:108:51: note: in definition of macro 'ADD_COUNTER' 108 | #define ADD_COUNTER(c,b,p) do { (c).bcnt += (b); (c).pcnt += (p); } while(0) | ^ include/linux/netfilter_bridge/ebtables.h:88:28: note: while referencing 'counters' 88 | struct ebt_counter counters[0] ____cacheline_aligned; | ^~~~~~~~ net/bridge/netfilter/ebtables.c:1292:49: warning: array subscript i is outside array bounds of 'struct ebt_counter[0]' [-Warray-bounds=] 1292 | ADD_COUNTER(t->private->counters[i], tmp[i].pcnt, tmp[i].bcnt); include/uapi/linux/netfilter/x_tables.h:108:51: note: in definition of macro 'ADD_COUNTER' 108 | #define ADD_COUNTER(c,b,p) do { (c).bcnt += (b); (c).pcnt += (p); } while(0) | ^ include/linux/netfilter_bridge/ebtables.h:88:28: note: while referencing 'counters' 88 | struct ebt_counter counters[0] ____cacheline_aligned; | ^~~~~~~~ In function '_copy_from_user', inlined from 'copy_from_user' at include/linux/uaccess.h:144:7, inlined from 'update_counters' at net/bridge/netfilter/ebtables.c:1308:6: include/linux/uaccess.h:112:17: warning: 'hlp' may be used uninitialized [-Wmaybe-uninitialized] 112 | kasan_check_write(to, n); | ^~~~~~~~~~~~~~~~~~~~~~~~ include/linux/kasan-checks.h: In function 'update_counters': include/linux/kasan-checks.h:7:6: note: by argument 1 of type 'const volatile void *' to 'kasan_check_write' declared here 7 | void kasan_check_write(const volatile void *p, unsigned int size); | ^~~~~~~~~~~~~~~~~ net/bridge/netfilter/ebtables.c:1306:28: note: 'hlp' declared here 1306 | struct ebt_replace hlp; | ^~~

vim +/uf +112 include/linux/uaccess.h d597580d373774 Al Viro 2017-03-20 104 d597580d373774 Al Viro 2017-03-20 105 #ifdef INLINE_COPY_FROM_USER d597580d373774 Al Viro 2017-03-20 106 static inline unsigned long d597580d373774 Al Viro 2017-03-20 107 _copy_from_user(void *to, const void __user *from, unsigned long n) d597580d373774 Al Viro 2017-03-20 108 { d597580d373774 Al Viro 2017-03-20 109 unsigned long res = n; 9c5f6908de03a4 Al Viro 2017-06-29 110 might_fault(); 4983cb67a383a7 Linus Torvalds 2019-02-14 111 if (likely(access_ok(from, n))) { 9c5f6908de03a4 Al Viro 2017-06-29 @112 kasan_check_write(to, n); d597580d373774 Al Viro 2017-03-20 113 res = raw_copy_from_user(to, from, n); 9c5f6908de03a4 Al Viro 2017-06-29 114 } d597580d373774 Al Viro 2017-03-20 115 if (unlikely(res)) d597580d373774 Al Viro 2017-03-20 116 memset(to + (n - res), 0, res); d597580d373774 Al Viro 2017-03-20 117 return res; d597580d373774 Al Viro 2017-03-20 118 } d597580d373774 Al Viro 2017-03-20 119 #else d597580d373774 Al Viro 2017-03-20 120 extern unsigned long d597580d373774 Al Viro 2017-03-20 121 _copy_from_user(void *, const void __user *, unsigned long); d597580d373774 Al Viro 2017-03-20 122 #endif d597580d373774 Al Viro 2017-03-20 123 :::::: The code at line 112 was first introduced by commit :::::: 9c5f6908de03a4f52ba7364b11fcd6116225480c copy_{from,to}_user(): move kasan checks and might_fault() out-of-line :::::: TO: Al Viro <viro@zeniv.linux.org.uk> :::::: CC: Al Viro <viro@zeniv.linux.org.uk> -- 0-DAY CI Kernel Test Service https://github.com/intel/lkp-tests/wiki