tree: git://git.infradead.org/users/hch/misc.git set_fs-sysctl head: 862858db7419b3123f7b182ceb2026ef94efc2a5 commit: 862858db7419b3123f7b182ceb2026ef94efc2a5 [6/6] sysctl: pass kernel pointers to ->proc_handler config: sparc-allyesconfig (attached as .config) compiler: sparc64-linux-gcc (GCC) 9.3.0 reproduce: wget https://raw.githubusercontent.com/intel/lkp-tests/master/sbin/make.cross -O ~/bin/make.cross chmod +x ~/bin/make.cross git checkout 862858db7419b3123f7b182ceb2026ef94efc2a5 # save the attached .config to linux build tree GCC_VERSION=9.3.0 make.cross ARCH=sparc If you fix the issue, kindly add following tag as appropriate Reported-by: kbuild test robot <lkp(a)intel.com&gt; All errors (new ones prefixed by >>): fs/proc/proc_sysctl.c: In function 'proc_sys_call_handler': 602 | static ssize_t proc_sys_read(struct file *filp, char __user *buf, | ^~~~~~~~~~~~~ fs/proc/proc_sysctl.c:602:1: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement] 602 | static ssize_t proc_sys_read(struct file *filp, char __user *buf, | ^~~~~~ 608 | static ssize_t proc_sys_write(struct file *filp, const char __user *buf, | ^~~~~~~~~~~~~~ 614 | static int proc_sys_open(struct inode *inode, struct file *filp) | ^~~~~~~~~~~~~ 631 | static __poll_t proc_sys_poll(struct file *filp, poll_table *wait) | ^~~~~~~~~~~~~ 663 | static bool proc_sys_fill_cache(struct file *file, | ^~~~~~~~~~~~~~~~~~~ 712 | static bool proc_sys_link_fill_cache(struct file *file, | ^~~~~~~~~~~~~~~~~~~~~~~~ 733 | static int scan(struct ctl_table_header *head, struct ctl_table *table, | ^~~~ 753 | static int proc_sys_readdir(struct file *file, struct dir_context *ctx) | ^~~~~~~~~~~~~~~~ 782 | static int proc_sys_permission(struct inode *inode, int mask) | ^~~~~~~~~~~~~~~~~~~ 810 | static int proc_sys_setattr(struct dentry *dentry, struct iattr *attr) | ^~~~~~~~~~~~~~~~ 827 | static int proc_sys_getattr(const struct path *path, struct kstat *stat, | ^~~~~~~~~~~~~~~~ 846 | .open = proc_sys_open, | ^~~~~~~~~~~~~ fs/proc/proc_sysctl.c:846:11: note: (near initialization for 'proc_sys_file_operations.open') fs/proc/proc_sysctl.c:847:11: error: initializer element is not constant 847 | .poll = proc_sys_poll, | ^~~~~~~~~~~~~ fs/proc/proc_sysctl.c:847:11: note: (near initialization for 'proc_sys_file_operations.poll') fs/proc/proc_sysctl.c:848:11: error: initializer element is not constant 848 | .read = proc_sys_read, | ^~~~~~~~~~~~~ fs/proc/proc_sysctl.c:848:11: note: (near initialization for 'proc_sys_file_operations.read') fs/proc/proc_sysctl.c:849:12: error: initializer element is not constant 849 | .write = proc_sys_write, | ^~~~~~~~~~~~~~ fs/proc/proc_sysctl.c:849:12: note: (near initialization for 'proc_sys_file_operations.write') fs/proc/proc_sysctl.c:855:20: error: initializer element is not constant 855 | .iterate_shared = proc_sys_readdir, | ^~~~~~~~~~~~~~~~ fs/proc/proc_sysctl.c:855:20: note: (near initialization for 'proc_sys_dir_file_operations.iterate_shared') fs/proc/proc_sysctl.c:860:16: error: initializer element is not constant 860 | .permission = proc_sys_permission, | ^~~~~~~~~~~~~~~~~~~ fs/proc/proc_sysctl.c:860:16: note: (near initialization for 'proc_sys_inode_operations.permission') fs/proc/proc_sysctl.c:861:13: error: initializer element is not constant 861 | .setattr = proc_sys_setattr, | ^~~~~~~~~~~~~~~~ fs/proc/proc_sysctl.c:861:13: note: (near initialization for 'proc_sys_inode_operations.setattr') fs/proc/proc_sysctl.c:862:13: error: initializer element is not constant 862 | .getattr = proc_sys_getattr, | ^~~~~~~~~~~~~~~~ fs/proc/proc_sysctl.c:862:13: note: (near initialization for 'proc_sys_inode_operations.getattr') fs/proc/proc_sysctl.c:867:16: error: initializer element is not constant 867 | .permission = proc_sys_permission, | ^~~~~~~~~~~~~~~~~~~ fs/proc/proc_sysctl.c:867:16: note: (near initialization for 'proc_sys_dir_operations.permission') fs/proc/proc_sysctl.c:868:13: error: initializer element is not constant 868 | .setattr = proc_sys_setattr, | ^~~~~~~~~~~~~~~~ fs/proc/proc_sysctl.c:868:13: note: (near initialization for 'proc_sys_dir_operations.setattr') fs/proc/proc_sysctl.c:869:13: error: initializer element is not constant 869 | .getattr = proc_sys_getattr, | ^~~~~~~~~~~~~~~~ fs/proc/proc_sysctl.c:869:13: note: (near initialization for 'proc_sys_dir_operations.getattr') 872 | static int proc_sys_revalidate(struct dentry *dentry, unsigned int flags) | ^~~~~~~~~~~~~~~~~~~ 879 | static int proc_sys_delete(const struct dentry *dentry) | ^~~~~~~~~~~~~~~ 884 | static int sysctl_is_seen(struct ctl_table_header *p) | ^~~~~~~~~~~~~~ 899 | static int proc_sys_compare(const struct dentry *dentry, | ^~~~~~~~~~~~~~~~ fs/proc/proc_sysctl.c:920:18: error: initializer element is not constant 920 | .d_revalidate = proc_sys_revalidate, | ^~~~~~~~~~~~~~~~~~~ fs/proc/proc_sysctl.c:920:18: note: (near initialization for 'proc_sys_dentry_operations.d_revalidate') fs/proc/proc_sysctl.c:921:14: error: initializer element is not constant 921 | .d_delete = proc_sys_delete, | ^~~~~~~~~~~~~~~ fs/proc/proc_sysctl.c:921:14: note: (near initialization for 'proc_sys_dentry_operations.d_delete') fs/proc/proc_sysctl.c:922:15: error: initializer element is not constant 922 | .d_compare = proc_sys_compare, | ^~~~~~~~~~~~~~~~ fs/proc/proc_sysctl.c:922:15: note: (near initialization for 'proc_sys_dentry_operations.d_compare') 925 | static struct ctl_dir *find_subdir(struct ctl_dir *dir, | ^~~~~~~~~~~ 939 | static struct ctl_dir *new_dir(struct ctl_table_set *set, | ^~~~~~~ 977 | static struct ctl_dir *get_subdir(struct ctl_dir *dir, | ^~~~~~~~~~ 1027 | static struct ctl_dir *xlate_dir(struct ctl_table_set *set, struct ctl_dir *dir) | ^~~~~~~~~ fs/proc/proc_sysctl.c:1040:12: error: invalid storage class for function 'sysctl_follow_link' 1040 | static int sysctl_follow_link(struct ctl_table_header **phead, | ^~~~~~~~~~~~~~~~~~ fs/proc/proc_sysctl.c:1074:12: error: invalid storage class for function 'sysctl_err' 1074 | static int sysctl_err(const char *path, struct ctl_table *table, char *fmt, ...) | ^~~~~~~~~~ fs/proc/proc_sysctl.c:1090:12: error: invalid storage class for function 'sysctl_check_table_array' 1090 | static int sysctl_check_table_array(const char *path, struct ctl_table *table) | ^~~~~~~~~~~~~~~~~~~~~~~~ fs/proc/proc_sysctl.c:1103:12: error: invalid storage class for function 'sysctl_check_table' 1103 | static int sysctl_check_table(const char *path, struct ctl_table *table) | ^~~~~~~~~~~~~~~~~~ fs/proc/proc_sysctl.c:1137:33: error: invalid storage class for function 'new_links' 1137 | static struct ctl_table_header *new_links(struct ctl_dir *dir, struct ctl_table *table, | ^~~~~~~~~ fs/proc/proc_sysctl.c:1180:13: error: invalid storage class for function 'get_links' 1180 | static bool get_links(struct ctl_dir *dir, | ^~~~~~~~~ fs/proc/proc_sysctl.c:1208:12: error: invalid storage class for function 'insert_links' 1208 | static int insert_links(struct ctl_table_header *head) | ^~~~~~~~~~~~ In file included from include/linux/linkage.h:7, from include/linux/kernel.h:8, from include/linux/list.h:9, from include/linux/sysctl.h:25, from fs/proc/proc_sysctl.c:6: fs/proc/proc_sysctl.c:1373:15: error: non-static declaration of 'register_sysctl' follows static declaration 1373 | EXPORT_SYMBOL(register_sysctl); | ^~~~~~~~~~~~~~~ include/linux/export.h:98:21: note: in definition of macro '___EXPORT_SYMBOL' 98 | extern typeof(sym) sym; \ | ^~~ include/linux/export.h:155:34: note: in expansion of macro '__EXPORT_SYMBOL' 155 | #define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, "") | ^~~~~~~~~~~~~~~ include/linux/export.h:158:29: note: in expansion of macro '_EXPORT_SYMBOL' 158 | #define EXPORT_SYMBOL(sym) _EXPORT_SYMBOL(sym, "") | ^~~~~~~~~~~~~~ fs/proc/proc_sysctl.c:1373:1: note: in expansion of macro 'EXPORT_SYMBOL' 1373 | EXPORT_SYMBOL(register_sysctl); | ^~~~~~~~~~~~~ fs/proc/proc_sysctl.c:1368:26: note: previous definition of 'register_sysctl' was here 1368 | struct ctl_table_header *register_sysctl(const char *path, struct ctl_table *table) | ^~~~~~~~~~~~~~~ In file included from include/linux/linkage.h:7, from include/linux/kernel.h:8, from include/linux/list.h:9, from include/linux/sysctl.h:25, from fs/proc/proc_sysctl.c:6: include/linux/export.h:67:2: warning: ISO C90 forbids mixed declarations and code [-Wdeclaration-after-statement] 67 | static const struct kernel_symbol __ksymtab_##sym \ | ^~~~~~ include/linux/export.h:108:2: note: in expansion of macro '__KSYMTAB_ENTRY' 108 | __KSYMTAB_ENTRY(sym, sec) | ^~~~~~~~~~~~~~~ include/linux/export.h:147:39: note: in expansion of macro '___EXPORT_SYMBOL' 147 | #define __EXPORT_SYMBOL(sym, sec, ns) ___EXPORT_SYMBOL(sym, sec, ns) | ^~~~~~~~~~~~~~~~ include/linux/export.h:155:34: note: in expansion of macro '__EXPORT_SYMBOL' 155 | #define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, "") | ^~~~~~~~~~~~~~~ include/linux/export.h:158:29: note: in expansion of macro '_EXPORT_SYMBOL' 158 | #define EXPORT_SYMBOL(sym) _EXPORT_SYMBOL(sym, "") | ^~~~~~~~~~~~~~ fs/proc/proc_sysctl.c:1373:1: note: in expansion of macro 'EXPORT_SYMBOL' 1373 | EXPORT_SYMBOL(register_sysctl); | ^~~~~~~~~~~~~ fs/proc/proc_sysctl.c:1375:14: error: invalid storage class for function 'append_path' 1375 | static char *append_path(const char *path, char *pos, const char *name) | ^~~~~~~~~~~ fs/proc/proc_sysctl.c:1388:12: error: invalid storage class for function 'count_subheaders' 1388 | static int count_subheaders(struct ctl_table *table) | ^~~~~~~~~~~~~~~~ fs/proc/proc_sysctl.c:1407:12: error: invalid storage class for function 'register_leaf_sysctl_tables' 1407 | static int register_leaf_sysctl_tables(const char *path, char *pos, | ^~~~~~~~~~~~~~~~~~~~~~~~~~~ In file included from include/linux/linkage.h:7, from include/linux/kernel.h:8, from include/linux/list.h:9, from include/linux/sysctl.h:25, from fs/proc/proc_sysctl.c:6: fs/proc/proc_sysctl.c:1569:15: error: non-static declaration of 'register_sysctl_paths' follows static declaration 1569 | EXPORT_SYMBOL(register_sysctl_paths); | ^~~~~~~~~~~~~~~~~~~~~ include/linux/export.h:98:21: note: in definition of macro '___EXPORT_SYMBOL' 98 | extern typeof(sym) sym; \ | ^~~ include/linux/export.h:155:34: note: in expansion of macro '__EXPORT_SYMBOL' 155 | #define _EXPORT_SYMBOL(sym, sec) __EXPORT_SYMBOL(sym, sec, "") | ^~~~~~~~~~~~~~~ include/linux/export.h:158:29: note: in expansion of macro '_EXPORT_SYMBOL' 158 | #define EXPORT_SYMBOL(sym) _EXPORT_SYMBOL(sym, "") | ^~~~~~~~~~~~~~ fs/proc/proc_sysctl.c:1569:1: note: in expansion of macro 'EXPORT_SYMBOL' 1569 | EXPORT_SYMBOL(register_sysctl_paths); | ^~~~~~~~~~~~~ fs/proc/proc_sysctl.c:1563:26: note: previous definition of 'register_sysctl_paths' was here 1563 | struct ctl_table_header *register_sysctl_paths(const struct ctl_path *path, -- kernel/bpf/cgroup.c: In function '__cgroup_bpf_run_filter_sysctl': 1173 | if (table->proc_handler(table, 0, ctx.cur_val, &ctx.cur_len, &pos)) { | ^~~ | ppos kernel/bpf/cgroup.c:1173:64: note: each undeclared identifier is reported only once for each function it appears in vim +/proc_sys_read +602 fs/proc/proc_sysctl.c 77b14db502cb85 Eric W. Biederman 2007-02-14 601 7708bfb1c855f2 Pavel Emelyanov 2008-04-29 @602 static ssize_t proc_sys_read(struct file *filp, char __user *buf, 77b14db502cb85 Eric W. Biederman 2007-02-14 603 size_t count, loff_t *ppos) 77b14db502cb85 Eric W. Biederman 2007-02-14 604 { 7708bfb1c855f2 Pavel Emelyanov 2008-04-29 605 return proc_sys_call_handler(filp, (void __user *)buf, count, ppos, 0); 7708bfb1c855f2 Pavel Emelyanov 2008-04-29 606 } 77b14db502cb85 Eric W. Biederman 2007-02-14 607 7708bfb1c855f2 Pavel Emelyanov 2008-04-29 @608 static ssize_t proc_sys_write(struct file *filp, const char __user *buf, 7708bfb1c855f2 Pavel Emelyanov 2008-04-29 609 size_t count, loff_t *ppos) 7708bfb1c855f2 Pavel Emelyanov 2008-04-29 610 { 7708bfb1c855f2 Pavel Emelyanov 2008-04-29 611 return proc_sys_call_handler(filp, (void __user *)buf, count, ppos, 1); 77b14db502cb85 Eric W. Biederman 2007-02-14 612 } 77b14db502cb85 Eric W. Biederman 2007-02-14 613 f1ecf06854a66e Lucas De Marchi 2011-11-02 @614 static int proc_sys_open(struct inode *inode, struct file *filp) f1ecf06854a66e Lucas De Marchi 2011-11-02 615 { 4e474a00d7ff74 Lucas De Marchi 2012-03-22 616 struct ctl_table_header *head = grab_header(inode); f1ecf06854a66e Lucas De Marchi 2011-11-02 617 struct ctl_table *table = PROC_I(inode)->sysctl_entry; f1ecf06854a66e Lucas De Marchi 2011-11-02 618 4e474a00d7ff74 Lucas De Marchi 2012-03-22 619 /* sysctl was unregistered */ 4e474a00d7ff74 Lucas De Marchi 2012-03-22 620 if (IS_ERR(head)) 4e474a00d7ff74 Lucas De Marchi 2012-03-22 621 return PTR_ERR(head); 4e474a00d7ff74 Lucas De Marchi 2012-03-22 622 f1ecf06854a66e Lucas De Marchi 2011-11-02 623 if (table->poll) f1ecf06854a66e Lucas De Marchi 2011-11-02 624 filp->private_data = proc_sys_poll_event(table->poll); f1ecf06854a66e Lucas De Marchi 2011-11-02 625 4e474a00d7ff74 Lucas De Marchi 2012-03-22 626 sysctl_head_finish(head); 4e474a00d7ff74 Lucas De Marchi 2012-03-22 627 f1ecf06854a66e Lucas De Marchi 2011-11-02 628 return 0; f1ecf06854a66e Lucas De Marchi 2011-11-02 629 } f1ecf06854a66e Lucas De Marchi 2011-11-02 630 076ccb76e1a6cf Al Viro 2017-07-03 @631 static __poll_t proc_sys_poll(struct file *filp, poll_table *wait) f1ecf06854a66e Lucas De Marchi 2011-11-02 632 { 496ad9aa8ef448 Al Viro 2013-01-23 633 struct inode *inode = file_inode(filp); 4e474a00d7ff74 Lucas De Marchi 2012-03-22 634 struct ctl_table_header *head = grab_header(inode); f1ecf06854a66e Lucas De Marchi 2011-11-02 635 struct ctl_table *table = PROC_I(inode)->sysctl_entry; 076ccb76e1a6cf Al Viro 2017-07-03 636 __poll_t ret = DEFAULT_POLLMASK; 4e474a00d7ff74 Lucas De Marchi 2012-03-22 637 unsigned long event; 4e474a00d7ff74 Lucas De Marchi 2012-03-22 638 4e474a00d7ff74 Lucas De Marchi 2012-03-22 639 /* sysctl was unregistered */ 4e474a00d7ff74 Lucas De Marchi 2012-03-22 640 if (IS_ERR(head)) a9a08845e9acbd Linus Torvalds 2018-02-11 641 return EPOLLERR | EPOLLHUP; f1ecf06854a66e Lucas De Marchi 2011-11-02 642 f1ecf06854a66e Lucas De Marchi 2011-11-02 643 if (!table->proc_handler) f1ecf06854a66e Lucas De Marchi 2011-11-02 644 goto out; f1ecf06854a66e Lucas De Marchi 2011-11-02 645 f1ecf06854a66e Lucas De Marchi 2011-11-02 646 if (!table->poll) f1ecf06854a66e Lucas De Marchi 2011-11-02 647 goto out; f1ecf06854a66e Lucas De Marchi 2011-11-02 648 4e474a00d7ff74 Lucas De Marchi 2012-03-22 649 event = (unsigned long)filp->private_data; f1ecf06854a66e Lucas De Marchi 2011-11-02 650 poll_wait(filp, &table->poll->wait, wait); f1ecf06854a66e Lucas De Marchi 2011-11-02 651 f1ecf06854a66e Lucas De Marchi 2011-11-02 652 if (event != atomic_read(&table->poll->event)) { f1ecf06854a66e Lucas De Marchi 2011-11-02 653 filp->private_data = proc_sys_poll_event(table->poll); a9a08845e9acbd Linus Torvalds 2018-02-11 654 ret = EPOLLIN | EPOLLRDNORM | EPOLLERR | EPOLLPRI; f1ecf06854a66e Lucas De Marchi 2011-11-02 655 } f1ecf06854a66e Lucas De Marchi 2011-11-02 656 f1ecf06854a66e Lucas De Marchi 2011-11-02 657 out: 4e474a00d7ff74 Lucas De Marchi 2012-03-22 658 sysctl_head_finish(head); 4e474a00d7ff74 Lucas De Marchi 2012-03-22 659 f1ecf06854a66e Lucas De Marchi 2011-11-02 660 return ret; f1ecf06854a66e Lucas De Marchi 2011-11-02 661 } 77b14db502cb85 Eric W. Biederman 2007-02-14 662 f0c3b5093addc8 Al Viro 2013-05-16 @663 static bool proc_sys_fill_cache(struct file *file, f0c3b5093addc8 Al Viro 2013-05-16 664 struct dir_context *ctx, 9043476f726802 Al Viro 2008-07-15 665 struct ctl_table_header *head, 9043476f726802 Al Viro 2008-07-15 666 struct ctl_table *table) 77b14db502cb85 Eric W. Biederman 2007-02-14 667 { f0c3b5093addc8 Al Viro 2013-05-16 668 struct dentry *child, *dir = file->f_path.dentry; 77b14db502cb85 Eric W. Biederman 2007-02-14 669 struct inode *inode; 77b14db502cb85 Eric W. Biederman 2007-02-14 670 struct qstr qname; 77b14db502cb85 Eric W. Biederman 2007-02-14 671 ino_t ino = 0; 77b14db502cb85 Eric W. Biederman 2007-02-14 672 unsigned type = DT_UNKNOWN; 77b14db502cb85 Eric W. Biederman 2007-02-14 673 77b14db502cb85 Eric W. Biederman 2007-02-14 674 qname.name = table->procname; 77b14db502cb85 Eric W. Biederman 2007-02-14 675 qname.len = strlen(table->procname); 8387ff2577eb9e Linus Torvalds 2016-06-10 676 qname.hash = full_name_hash(dir, qname.name, qname.len); 77b14db502cb85 Eric W. Biederman 2007-02-14 677 77b14db502cb85 Eric W. Biederman 2007-02-14 678 child = d_lookup(dir, &qname); 77b14db502cb85 Eric W. Biederman 2007-02-14 679 if (!child) { 76aab3ab61f305 Al Viro 2016-04-20 680 DECLARE_WAIT_QUEUE_HEAD_ONSTACK(wq); 76aab3ab61f305 Al Viro 2016-04-20 681 child = d_alloc_parallel(dir, &qname, &wq); 76aab3ab61f305 Al Viro 2016-04-20 682 if (IS_ERR(child)) 76aab3ab61f305 Al Viro 2016-04-20 683 return false; 76aab3ab61f305 Al Viro 2016-04-20 684 if (d_in_lookup(child)) { 888e2b03ef5669 Al Viro 2018-05-03 685 struct dentry *res; 9043476f726802 Al Viro 2008-07-15 686 inode = proc_sys_make_inode(dir->d_sb, head, table); ea5751ccd665a2 Ivan Delalande 2018-12-13 687 if (IS_ERR(inode)) { 76aab3ab61f305 Al Viro 2016-04-20 688 d_lookup_done(child); 9043476f726802 Al Viro 2008-07-15 689 dput(child); f0c3b5093addc8 Al Viro 2013-05-16 690 return false; 76aab3ab61f305 Al Viro 2016-04-20 691 } fb045adb99d9b7 Nick Piggin 2011-01-07 692 d_set_d_op(child, &proc_sys_dentry_operations); 888e2b03ef5669 Al Viro 2018-05-03 693 res = d_splice_alias(inode, child); 888e2b03ef5669 Al Viro 2018-05-03 694 d_lookup_done(child); 888e2b03ef5669 Al Viro 2018-05-03 695 if (unlikely(res)) { 888e2b03ef5669 Al Viro 2018-05-03 696 if (IS_ERR(res)) { 888e2b03ef5669 Al Viro 2018-05-03 697 dput(child); 888e2b03ef5669 Al Viro 2018-05-03 698 return false; 888e2b03ef5669 Al Viro 2018-05-03 699 } 888e2b03ef5669 Al Viro 2018-05-03 700 dput(child); 888e2b03ef5669 Al Viro 2018-05-03 701 child = res; 888e2b03ef5669 Al Viro 2018-05-03 702 } 77b14db502cb85 Eric W. Biederman 2007-02-14 703 } 77b14db502cb85 Eric W. Biederman 2007-02-14 704 } 2b0143b5c986be David Howells 2015-03-17 705 inode = d_inode(child); 77b14db502cb85 Eric W. Biederman 2007-02-14 706 ino = inode->i_ino; 77b14db502cb85 Eric W. Biederman 2007-02-14 707 type = inode->i_mode >> 12; 77b14db502cb85 Eric W. Biederman 2007-02-14 708 dput(child); f0c3b5093addc8 Al Viro 2013-05-16 709 return dir_emit(ctx, qname.name, qname.len, ino, type); 9043476f726802 Al Viro 2008-07-15 710 } 9043476f726802 Al Viro 2008-07-15 711 f0c3b5093addc8 Al Viro 2013-05-16 @712 static bool proc_sys_link_fill_cache(struct file *file, f0c3b5093addc8 Al Viro 2013-05-16 713 struct dir_context *ctx, 0e47c99d7fe25e Eric W. Biederman 2012-01-07 714 struct ctl_table_header *head, 0e47c99d7fe25e Eric W. Biederman 2012-01-07 715 struct ctl_table *table) 0e47c99d7fe25e Eric W. Biederman 2012-01-07 716 { f0c3b5093addc8 Al Viro 2013-05-16 717 bool ret = true; a0b0d1c345d031 Danilo Krummrich 2018-04-10 718 0e47c99d7fe25e Eric W. Biederman 2012-01-07 719 head = sysctl_head_grab(head); a0b0d1c345d031 Danilo Krummrich 2018-04-10 720 if (IS_ERR(head)) a0b0d1c345d031 Danilo Krummrich 2018-04-10 721 return false; 0e47c99d7fe25e Eric W. Biederman 2012-01-07 722 0e47c99d7fe25e Eric W. Biederman 2012-01-07 723 /* It is not an error if we can not follow the link ignore it */ 835b94e05c92e6 Danilo Krummrich 2018-04-10 724 if (sysctl_follow_link(&head, &table)) 0e47c99d7fe25e Eric W. Biederman 2012-01-07 725 goto out; 0e47c99d7fe25e Eric W. Biederman 2012-01-07 726 f0c3b5093addc8 Al Viro 2013-05-16 727 ret = proc_sys_fill_cache(file, ctx, head, table); 0e47c99d7fe25e Eric W. Biederman 2012-01-07 728 out: 0e47c99d7fe25e Eric W. Biederman 2012-01-07 729 sysctl_head_finish(head); 0e47c99d7fe25e Eric W. Biederman 2012-01-07 730 return ret; 0e47c99d7fe25e Eric W. Biederman 2012-01-07 731 } 0e47c99d7fe25e Eric W. Biederman 2012-01-07 732 e5eea0981a3840 Joe Perches 2014-08-08 @733 static int scan(struct ctl_table_header *head, struct ctl_table *table, 9043476f726802 Al Viro 2008-07-15 734 unsigned long *pos, struct file *file, f0c3b5093addc8 Al Viro 2013-05-16 735 struct dir_context *ctx) 9043476f726802 Al Viro 2008-07-15 736 { f0c3b5093addc8 Al Viro 2013-05-16 737 bool res; 9043476f726802 Al Viro 2008-07-15 738 f0c3b5093addc8 Al Viro 2013-05-16 739 if ((*pos)++ < ctx->pos) f0c3b5093addc8 Al Viro 2013-05-16 740 return true; 9043476f726802 Al Viro 2008-07-15 741 0e47c99d7fe25e Eric W. Biederman 2012-01-07 742 if (unlikely(S_ISLNK(table->mode))) f0c3b5093addc8 Al Viro 2013-05-16 743 res = proc_sys_link_fill_cache(file, ctx, head, table); 0e47c99d7fe25e Eric W. Biederman 2012-01-07 744 else f0c3b5093addc8 Al Viro 2013-05-16 745 res = proc_sys_fill_cache(file, ctx, head, table); 9043476f726802 Al Viro 2008-07-15 746 f0c3b5093addc8 Al Viro 2013-05-16 747 if (res) f0c3b5093addc8 Al Viro 2013-05-16 748 ctx->pos = *pos; 6a75ce167c53b4 Eric W. Biederman 2012-01-18 749 6a75ce167c53b4 Eric W. Biederman 2012-01-18 750 return res; 77b14db502cb85 Eric W. Biederman 2007-02-14 751 } 77b14db502cb85 Eric W. Biederman 2007-02-14 752 f0c3b5093addc8 Al Viro 2013-05-16 @753 static int proc_sys_readdir(struct file *file, struct dir_context *ctx) 77b14db502cb85 Eric W. Biederman 2007-02-14 754 { f0c3b5093addc8 Al Viro 2013-05-16 755 struct ctl_table_header *head = grab_header(file_inode(file)); 9043476f726802 Al Viro 2008-07-15 756 struct ctl_table_header *h = NULL; 6a75ce167c53b4 Eric W. Biederman 2012-01-18 757 struct ctl_table *entry; 7ec66d06362da7 Eric W. Biederman 2011-12-29 758 struct ctl_dir *ctl_dir; 77b14db502cb85 Eric W. Biederman 2007-02-14 759 unsigned long pos; 77b14db502cb85 Eric W. Biederman 2007-02-14 760 9043476f726802 Al Viro 2008-07-15 761 if (IS_ERR(head)) 9043476f726802 Al Viro 2008-07-15 762 return PTR_ERR(head); 9043476f726802 Al Viro 2008-07-15 763 7ec66d06362da7 Eric W. Biederman 2011-12-29 764 ctl_dir = container_of(head, struct ctl_dir, header); 77b14db502cb85 Eric W. Biederman 2007-02-14 765 f0c3b5093addc8 Al Viro 2013-05-16 766 if (!dir_emit_dots(file, ctx)) 93362fa47fe98b Zhou Chengming 2017-01-06 767 goto out; f0c3b5093addc8 Al Viro 2013-05-16 768 77b14db502cb85 Eric W. Biederman 2007-02-14 769 pos = 2; 77b14db502cb85 Eric W. Biederman 2007-02-14 770 7ec66d06362da7 Eric W. Biederman 2011-12-29 771 for (first_entry(ctl_dir, &h, &entry); h; next_entry(&h, &entry)) { f0c3b5093addc8 Al Viro 2013-05-16 772 if (!scan(h, entry, &pos, file, ctx)) { 9043476f726802 Al Viro 2008-07-15 773 sysctl_head_finish(h); 9043476f726802 Al Viro 2008-07-15 774 break; 77b14db502cb85 Eric W. Biederman 2007-02-14 775 } 77b14db502cb85 Eric W. Biederman 2007-02-14 776 } 93362fa47fe98b Zhou Chengming 2017-01-06 777 out: 77b14db502cb85 Eric W. Biederman 2007-02-14 778 sysctl_head_finish(head); f0c3b5093addc8 Al Viro 2013-05-16 779 return 0; 77b14db502cb85 Eric W. Biederman 2007-02-14 780 } 77b14db502cb85 Eric W. Biederman 2007-02-14 781 10556cb21a0d0b Al Viro 2011-06-20 @782 static int proc_sys_permission(struct inode *inode, int mask) 77b14db502cb85 Eric W. Biederman 2007-02-14 783 { 77b14db502cb85 Eric W. Biederman 2007-02-14 784 /* 77b14db502cb85 Eric W. Biederman 2007-02-14 785 * sysctl entries that are not writeable, 77b14db502cb85 Eric W. Biederman 2007-02-14 786 * are _NOT_ writeable, capabilities or not. 77b14db502cb85 Eric W. Biederman 2007-02-14 787 */ f696a3659fc4b3 Miklos Szeredi 2008-07-31 788 struct ctl_table_header *head; f696a3659fc4b3 Miklos Szeredi 2008-07-31 789 struct ctl_table *table; 77b14db502cb85 Eric W. Biederman 2007-02-14 790 int error; 77b14db502cb85 Eric W. Biederman 2007-02-14 791 f696a3659fc4b3 Miklos Szeredi 2008-07-31 792 /* Executable files are not allowed under /proc/sys/ */ f696a3659fc4b3 Miklos Szeredi 2008-07-31 793 if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) f696a3659fc4b3 Miklos Szeredi 2008-07-31 794 return -EACCES; f696a3659fc4b3 Miklos Szeredi 2008-07-31 795 f696a3659fc4b3 Miklos Szeredi 2008-07-31 796 head = grab_header(inode); 9043476f726802 Al Viro 2008-07-15 797 if (IS_ERR(head)) 9043476f726802 Al Viro 2008-07-15 798 return PTR_ERR(head); 77b14db502cb85 Eric W. Biederman 2007-02-14 799 f696a3659fc4b3 Miklos Szeredi 2008-07-31 800 table = PROC_I(inode)->sysctl_entry; 9043476f726802 Al Viro 2008-07-15 801 if (!table) /* global root - r-xr-xr-x */ 9043476f726802 Al Viro 2008-07-15 802 error = mask & MAY_WRITE ? -EACCES : 0; 9043476f726802 Al Viro 2008-07-15 803 else /* Use the permissions on the sysctl table entry */ 73f7ef435934e9 Eric W. Biederman 2012-11-16 804 error = sysctl_perm(head, table, mask & ~MAY_NOT_BLOCK); 9043476f726802 Al Viro 2008-07-15 805 77b14db502cb85 Eric W. Biederman 2007-02-14 806 sysctl_head_finish(head); 77b14db502cb85 Eric W. Biederman 2007-02-14 807 return error; 77b14db502cb85 Eric W. Biederman 2007-02-14 808 } 77b14db502cb85 Eric W. Biederman 2007-02-14 809 :::::: The code at line 602 was first introduced by commit :::::: 7708bfb1c855f2a076ef71cc21647deea022ebe7 sysctl: merge equal proc_sys_read and proc_sys_write :::::: TO: Pavel Emelyanov <xemul(a)openvz.org&gt; :::::: CC: Linus Torvalds <torvalds(a)linux-foundation.org&gt; --- 0-DAY CI Kernel Test Service, Intel Corporation https://lists.01.org/hyperkitty/list/kbuild-all@lists.01.org