mirror of
https://github.com/edk2-porting/linux-next.git
synced 2024-12-27 06:34:11 +08:00
d97b46a646
While doing the checkpoint-restore in the user space one need to determine whether various kernel objects (like mm_struct-s of file_struct-s) are shared between tasks and restore this state. The 2nd step can be solved by using appropriate CLONE_ flags and the unshare syscall, while there's currently no ways for solving the 1st one. One of the ways for checking whether two tasks share e.g. mm_struct is to provide some mm_struct ID of a task to its proc file, but showing such info considered to be not that good for security reasons. Thus after some debates we end up in conclusion that using that named 'comparison' syscall might be the best candidate. So here is it -- __NR_kcmp. It takes up to 5 arguments - the pids of the two tasks (which characteristics should be compared), the comparison type and (in case of comparison of files) two file descriptors. Lookups for pids are done in the caller's PID namespace only. At moment only x86 is supported and tested. [akpm@linux-foundation.org: fix up selftests, warnings] [akpm@linux-foundation.org: include errno.h] [akpm@linux-foundation.org: tweak comment text] Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org> Acked-by: "Eric W. Biederman" <ebiederm@xmission.com> Cc: Pavel Emelyanov <xemul@parallels.com> Cc: Andrey Vagin <avagin@openvz.org> Cc: KOSAKI Motohiro <kosaki.motohiro@gmail.com> Cc: Ingo Molnar <mingo@elte.hu> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: Glauber Costa <glommer@parallels.com> Cc: Andi Kleen <andi@firstfloor.org> Cc: Tejun Heo <tj@kernel.org> Cc: Matt Helsley <matthltc@us.ibm.com> Cc: Pekka Enberg <penberg@kernel.org> Cc: Eric Dumazet <eric.dumazet@gmail.com> Cc: Vasiliy Kulikov <segoon@openwall.com> Cc: Alexey Dobriyan <adobriyan@gmail.com> Cc: Valdis.Kletnieks@vt.edu Cc: Michal Marek <mmarek@suse.cz> Cc: Frederic Weisbecker <fweisbec@gmail.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
209 lines
5.8 KiB
C
209 lines
5.8 KiB
C
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#include <linux/linkage.h>
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#include <linux/errno.h>
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#include <asm/unistd.h>
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/* we can't #include <linux/syscalls.h> here,
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but tell gcc to not warn with -Wmissing-prototypes */
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asmlinkage long sys_ni_syscall(void);
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/*
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* Non-implemented system calls get redirected here.
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*/
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asmlinkage long sys_ni_syscall(void)
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{
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return -ENOSYS;
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}
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cond_syscall(sys_quotactl);
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cond_syscall(sys32_quotactl);
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cond_syscall(sys_acct);
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cond_syscall(sys_lookup_dcookie);
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cond_syscall(sys_swapon);
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cond_syscall(sys_swapoff);
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cond_syscall(sys_kexec_load);
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cond_syscall(compat_sys_kexec_load);
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cond_syscall(sys_init_module);
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cond_syscall(sys_delete_module);
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cond_syscall(sys_socketpair);
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cond_syscall(sys_bind);
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cond_syscall(sys_listen);
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cond_syscall(sys_accept);
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cond_syscall(sys_accept4);
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cond_syscall(sys_connect);
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cond_syscall(sys_getsockname);
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cond_syscall(sys_getpeername);
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cond_syscall(sys_sendto);
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cond_syscall(sys_send);
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cond_syscall(sys_recvfrom);
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cond_syscall(sys_recv);
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cond_syscall(sys_socket);
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cond_syscall(sys_setsockopt);
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cond_syscall(compat_sys_setsockopt);
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cond_syscall(sys_getsockopt);
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cond_syscall(compat_sys_getsockopt);
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cond_syscall(sys_shutdown);
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cond_syscall(sys_sendmsg);
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cond_syscall(sys_sendmmsg);
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cond_syscall(compat_sys_sendmsg);
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cond_syscall(compat_sys_sendmmsg);
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cond_syscall(sys_recvmsg);
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cond_syscall(sys_recvmmsg);
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cond_syscall(compat_sys_recvmsg);
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cond_syscall(compat_sys_recv);
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cond_syscall(compat_sys_recvfrom);
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cond_syscall(compat_sys_recvmmsg);
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cond_syscall(sys_socketcall);
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cond_syscall(sys_futex);
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cond_syscall(compat_sys_futex);
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cond_syscall(sys_set_robust_list);
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cond_syscall(compat_sys_set_robust_list);
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cond_syscall(sys_get_robust_list);
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cond_syscall(compat_sys_get_robust_list);
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cond_syscall(sys_epoll_create);
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cond_syscall(sys_epoll_create1);
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cond_syscall(sys_epoll_ctl);
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cond_syscall(sys_epoll_wait);
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cond_syscall(sys_epoll_pwait);
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cond_syscall(compat_sys_epoll_pwait);
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cond_syscall(sys_semget);
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cond_syscall(sys_semop);
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cond_syscall(sys_semtimedop);
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cond_syscall(compat_sys_semtimedop);
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cond_syscall(sys_semctl);
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cond_syscall(compat_sys_semctl);
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cond_syscall(sys_msgget);
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cond_syscall(sys_msgsnd);
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cond_syscall(compat_sys_msgsnd);
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cond_syscall(sys_msgrcv);
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cond_syscall(compat_sys_msgrcv);
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cond_syscall(sys_msgctl);
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cond_syscall(compat_sys_msgctl);
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cond_syscall(sys_shmget);
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cond_syscall(sys_shmat);
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cond_syscall(compat_sys_shmat);
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cond_syscall(sys_shmdt);
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cond_syscall(sys_shmctl);
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cond_syscall(compat_sys_shmctl);
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cond_syscall(sys_mq_open);
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cond_syscall(sys_mq_unlink);
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cond_syscall(sys_mq_timedsend);
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cond_syscall(sys_mq_timedreceive);
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cond_syscall(sys_mq_notify);
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cond_syscall(sys_mq_getsetattr);
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cond_syscall(compat_sys_mq_open);
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cond_syscall(compat_sys_mq_timedsend);
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cond_syscall(compat_sys_mq_timedreceive);
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cond_syscall(compat_sys_mq_notify);
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cond_syscall(compat_sys_mq_getsetattr);
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cond_syscall(sys_mbind);
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cond_syscall(sys_get_mempolicy);
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cond_syscall(sys_set_mempolicy);
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cond_syscall(compat_sys_mbind);
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cond_syscall(compat_sys_get_mempolicy);
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cond_syscall(compat_sys_set_mempolicy);
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cond_syscall(sys_add_key);
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cond_syscall(sys_request_key);
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cond_syscall(sys_keyctl);
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cond_syscall(compat_sys_keyctl);
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cond_syscall(compat_sys_socketcall);
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cond_syscall(sys_inotify_init);
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cond_syscall(sys_inotify_init1);
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cond_syscall(sys_inotify_add_watch);
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cond_syscall(sys_inotify_rm_watch);
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cond_syscall(sys_migrate_pages);
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cond_syscall(sys_move_pages);
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cond_syscall(sys_chown16);
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cond_syscall(sys_fchown16);
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cond_syscall(sys_getegid16);
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cond_syscall(sys_geteuid16);
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cond_syscall(sys_getgid16);
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cond_syscall(sys_getgroups16);
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cond_syscall(sys_getresgid16);
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cond_syscall(sys_getresuid16);
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cond_syscall(sys_getuid16);
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cond_syscall(sys_lchown16);
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cond_syscall(sys_setfsgid16);
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cond_syscall(sys_setfsuid16);
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cond_syscall(sys_setgid16);
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cond_syscall(sys_setgroups16);
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cond_syscall(sys_setregid16);
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cond_syscall(sys_setresgid16);
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cond_syscall(sys_setresuid16);
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cond_syscall(sys_setreuid16);
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cond_syscall(sys_setuid16);
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cond_syscall(sys_vm86old);
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cond_syscall(sys_vm86);
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cond_syscall(sys_ipc);
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cond_syscall(compat_sys_ipc);
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cond_syscall(compat_sys_sysctl);
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cond_syscall(sys_flock);
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cond_syscall(sys_io_setup);
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cond_syscall(sys_io_destroy);
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cond_syscall(sys_io_submit);
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cond_syscall(sys_io_cancel);
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cond_syscall(sys_io_getevents);
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cond_syscall(sys_syslog);
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cond_syscall(sys_process_vm_readv);
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cond_syscall(sys_process_vm_writev);
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cond_syscall(compat_sys_process_vm_readv);
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cond_syscall(compat_sys_process_vm_writev);
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/* arch-specific weak syscall entries */
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cond_syscall(sys_pciconfig_read);
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cond_syscall(sys_pciconfig_write);
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cond_syscall(sys_pciconfig_iobase);
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cond_syscall(sys32_ipc);
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cond_syscall(ppc_rtas);
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cond_syscall(sys_spu_run);
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cond_syscall(sys_spu_create);
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cond_syscall(sys_subpage_prot);
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/* mmu depending weak syscall entries */
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cond_syscall(sys_mprotect);
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cond_syscall(sys_msync);
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cond_syscall(sys_mlock);
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cond_syscall(sys_munlock);
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cond_syscall(sys_mlockall);
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cond_syscall(sys_munlockall);
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cond_syscall(sys_mincore);
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cond_syscall(sys_madvise);
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cond_syscall(sys_mremap);
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cond_syscall(sys_remap_file_pages);
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cond_syscall(compat_sys_move_pages);
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cond_syscall(compat_sys_migrate_pages);
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/* block-layer dependent */
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cond_syscall(sys_bdflush);
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cond_syscall(sys_ioprio_set);
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cond_syscall(sys_ioprio_get);
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/* New file descriptors */
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cond_syscall(sys_signalfd);
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cond_syscall(sys_signalfd4);
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cond_syscall(compat_sys_signalfd);
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cond_syscall(compat_sys_signalfd4);
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cond_syscall(sys_timerfd_create);
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cond_syscall(sys_timerfd_settime);
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cond_syscall(sys_timerfd_gettime);
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cond_syscall(compat_sys_timerfd_settime);
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cond_syscall(compat_sys_timerfd_gettime);
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cond_syscall(sys_eventfd);
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cond_syscall(sys_eventfd2);
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/* performance counters: */
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cond_syscall(sys_perf_event_open);
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/* fanotify! */
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cond_syscall(sys_fanotify_init);
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cond_syscall(sys_fanotify_mark);
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/* open by handle */
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cond_syscall(sys_name_to_handle_at);
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cond_syscall(sys_open_by_handle_at);
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cond_syscall(compat_sys_open_by_handle_at);
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/* compare kernel pointers */
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cond_syscall(sys_kcmp);
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