Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S932075AbWHPPh2 (ORCPT ); Wed, 16 Aug 2006 11:37:28 -0400 Received: (majordomo@vger.kernel.org) by vger.kernel.org id S932081AbWHPPh2 (ORCPT ); Wed, 16 Aug 2006 11:37:28 -0400 Received: from mailhub.sw.ru ([195.214.233.200]:64424 "EHLO relay.sw.ru") by vger.kernel.org with ESMTP id S932077AbWHPPh1 (ORCPT ); Wed, 16 Aug 2006 11:37:27 -0400 Message-ID: <44E33C3F.3010509@sw.ru> Date: Wed, 16 Aug 2006 19:39:43 +0400 From: Kirill Korotaev User-Agent: Mozilla/5.0 (X11; U; Linux i686; en-US; rv:1.7.13) Gecko/20060417 X-Accept-Language: en-us, en, ru MIME-Version: 1.0 To: Andrew Morton CC: Linux Kernel Mailing List , Alan Cox , Ingo Molnar , Christoph Hellwig , Pavel Emelianov , Andrey Savochkin , devel@openvz.org, Rik van Riel , hugh@veritas.com, ckrm-tech@lists.sourceforge.net, Andi Kleen Subject: [RFC][PATCH 4/7] UBC: syscalls (user interface) References: <44E33893.6020700@sw.ru> In-Reply-To: <44E33893.6020700@sw.ru> Content-Type: text/plain; charset=us-ascii; format=flowed Content-Transfer-Encoding: 7bit Sender: linux-kernel-owner@vger.kernel.org X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 9389 Lines: 312 Add the following system calls for UB management: 1. sys_getluid - get current UB id 2. sys_setluid - changes exec_ and fork_ UBs on current 3. sys_setublimit - set limits for resources consumtions Signed-Off-By: Pavel Emelianov Signed-Off-By: Kirill Korotaev --- arch/i386/kernel/syscall_table.S | 3 arch/ia64/kernel/entry.S | 3 arch/sparc/kernel/systbls.S | 2 arch/sparc64/kernel/systbls.S | 2 include/asm-i386/unistd.h | 5 + include/asm-ia64/unistd.h | 5 + include/asm-powerpc/systbl.h | 3 include/asm-powerpc/unistd.h | 5 + include/asm-sparc/unistd.h | 3 include/asm-sparc64/unistd.h | 3 include/asm-x86_64/unistd.h | 8 ++ kernel/ub/Makefile | 1 kernel/ub/sys.c | 126 +++++++++++++++++++++++++++++++++++++++ 13 files changed, 163 insertions(+), 6 deletions(-) --- ./arch/i386/kernel/syscall_table.S.ubsys 2006-07-10 12:39:10.000000000 +0400 +++ ./arch/i386/kernel/syscall_table.S 2006-07-31 14:36:59.000000000 +0400 @@ -317,3 +317,6 @@ ENTRY(sys_call_table) .long sys_vmsplice .long sys_move_pages .long sys_getcpu + .long sys_getluid + .long sys_setluid + .long sys_setublimit /* 320 */ --- ./arch/ia64/kernel/entry.S.ubsys 2006-07-10 12:39:10.000000000 +0400 +++ ./arch/ia64/kernel/entry.S 2006-07-31 15:25:36.000000000 +0400 @@ -1610,5 +1610,8 @@ sys_call_table: data8 sys_sync_file_range // 1300 data8 sys_tee data8 sys_vmsplice + daat8 sys_getluid + data8 sys_setluid + data8 sys_setublimit // 1305 .org sys_call_table + 8*NR_syscalls // guard against failures to increase NR_syscalls --- ./arch/sparc/kernel/systbls.S.arsys 2006-07-10 12:39:10.000000000 +0400 +++ ./arch/sparc/kernel/systbls.S 2006-08-10 17:07:15.000000000 +0400 @@ -78,7 +78,7 @@ sys_call_table: /*285*/ .long sys_mkdirat, sys_mknodat, sys_fchownat, sys_futimesat, sys_fstatat64 /*290*/ .long sys_unlinkat, sys_renameat, sys_linkat, sys_symlinkat, sys_readlinkat /*295*/ .long sys_fchmodat, sys_faccessat, sys_pselect6, sys_ppoll, sys_unshare -/*300*/ .long sys_set_robust_list, sys_get_robust_list +/*300*/ .long sys_set_robust_list, sys_get_robust_list, sys_getluid, sys_setluid, sys_setublimit #ifdef CONFIG_SUNOS_EMUL /* Now the SunOS syscall table. */ --- ./arch/sparc64/kernel/systbls.S.arsys 2006-07-10 12:39:11.000000000 +0400 +++ ./arch/sparc64/kernel/systbls.S 2006-08-10 17:08:52.000000000 +0400 @@ -79,7 +79,7 @@ sys_call_table32: .word sys_mkdirat, sys_mknodat, sys_fchownat, compat_sys_futimesat, compat_sys_fstatat64 /*290*/ .word sys_unlinkat, sys_renameat, sys_linkat, sys_symlinkat, sys_readlinkat .word sys_fchmodat, sys_faccessat, compat_sys_pselect6, compat_sys_ppoll, sys_unshare -/*300*/ .word compat_sys_set_robust_list, compat_sys_get_robust_list +/*300*/ .word compat_sys_set_robust_list, compat_sys_get_robust_list, sys_getluid, sys_setluid, sys_setublimit #endif /* CONFIG_COMPAT */ --- ./include/asm-i386/unistd.h.ubsys 2006-07-10 12:39:19.000000000 +0400 +++ ./include/asm-i386/unistd.h 2006-07-31 15:56:31.000000000 +0400 @@ -323,10 +323,13 @@ #define __NR_vmsplice 316 #define __NR_move_pages 317 #define __NR_getcpu 318 +#define __NR_getluid 319 +#define __NR_setluid 320 +#define __NR_setublimit 321 #ifdef __KERNEL__ -#define NR_syscalls 318 +#define NR_syscalls 322 #include /* --- ./include/asm-ia64/unistd.h.ubsys 2006-07-10 12:39:19.000000000 +0400 +++ ./include/asm-ia64/unistd.h 2006-07-31 15:57:23.000000000 +0400 @@ -291,11 +291,14 @@ #define __NR_sync_file_range 1300 #define __NR_tee 1301 #define __NR_vmsplice 1302 +#define __NR_getluid 1303 +#define __NR_setluid 1304 +#define __NR_setublimit 1305 #ifdef __KERNEL__ -#define NR_syscalls 279 /* length of syscall table */ +#define NR_syscalls 282 /* length of syscall table */ #define __ARCH_WANT_SYS_RT_SIGACTION --- ./include/asm-powerpc/systbl.h.arsys 2006-07-10 12:39:19.000000000 +0400 +++ ./include/asm-powerpc/systbl.h 2006-08-10 17:05:53.000000000 +0400 @@ -304,3 +304,6 @@ SYSCALL_SPU(fchmodat) SYSCALL_SPU(faccessat) COMPAT_SYS_SPU(get_robust_list) COMPAT_SYS_SPU(set_robust_list) +SYSCALL(sys_getluid) +SYSCALL(sys_setluid) +SYSCALL(sys_setublimit) --- ./include/asm-powerpc/unistd.h.arsys 2006-07-10 12:39:19.000000000 +0400 +++ ./include/asm-powerpc/unistd.h 2006-08-10 17:06:28.000000000 +0400 @@ -323,10 +323,13 @@ #define __NR_faccessat 298 #define __NR_get_robust_list 299 #define __NR_set_robust_list 300 +#define __NR_getluid 301 +#define __NR_setluid 302 +#define __NR_setublimit 303 #ifdef __KERNEL__ -#define __NR_syscalls 301 +#define __NR_syscalls 304 #define __NR__exit __NR_exit #define NR_syscalls __NR_syscalls --- ./include/asm-sparc/unistd.h.arsys 2006-07-10 12:39:19.000000000 +0400 +++ ./include/asm-sparc/unistd.h 2006-08-10 17:08:19.000000000 +0400 @@ -318,6 +318,9 @@ #define __NR_unshare 299 #define __NR_set_robust_list 300 #define __NR_get_robust_list 301 +#define __NR_getluid 302 +#define __NR_setluid 303 +#define __NR_setublimit 304 #ifdef __KERNEL__ /* WARNING: You MAY NOT add syscall numbers larger than 301, since --- ./include/asm-sparc64/unistd.h.arsys 2006-07-10 12:39:19.000000000 +0400 +++ ./include/asm-sparc64/unistd.h 2006-08-10 17:09:24.000000000 +0400 @@ -320,6 +320,9 @@ #define __NR_unshare 299 #define __NR_set_robust_list 300 #define __NR_get_robust_list 301 +#define __NR_getluid 302 +#define __NR_setluid 303 +#define __NR_setublimit 304 #ifdef __KERNEL__ /* WARNING: You MAY NOT add syscall numbers larger than 301, since --- ./include/asm-x86_64/unistd.h.ubsys 2006-07-10 12:39:19.000000000 +0400 +++ ./include/asm-x86_64/unistd.h 2006-07-31 16:00:01.000000000 +0400 @@ -619,10 +619,16 @@ __SYSCALL(__NR_sync_file_range, sys_sync __SYSCALL(__NR_vmsplice, sys_vmsplice) #define __NR_move_pages 279 __SYSCALL(__NR_move_pages, sys_move_pages) +#define __NR_getluid 280 +__SYSCALL(__NR_getluid, sys_getluid) +#define __NR_setluid 281 +__SYSCALL(__NR_setluid, sys_setluid) +#define __NR_setublimit 282 +__SYSCALL(__NR_setublimit, sys_setublimit) #ifdef __KERNEL__ -#define __NR_syscall_max __NR_move_pages +#define __NR_syscall_max __NR_setublimit #include #ifndef __NO_STUBS --- ./kernel/ub/Makefile.ubsys 2006-07-28 14:08:37.000000000 +0400 +++ ./kernel/ub/Makefile 2006-08-01 11:08:39.000000000 +0400 @@ -6,3 +6,4 @@ obj-$(CONFIG_USER_RESOURCE) += beancounter.o obj-$(CONFIG_USER_RESOURCE) += misc.o +obj-y += sys.o --- ./kernel/ub/sys.c.ubsys 2006-07-28 18:52:18.000000000 +0400 +++ ./kernel/ub/sys.c 2006-08-03 16:14:23.000000000 +0400 @@ -0,0 +1,126 @@ +/* + * kernel/ub/sys.c + * + * Copyright (C) 2006 OpenVZ. SWsoft Inc + * + */ + +#include +#include +#include + +#include +#include + +#ifndef CONFIG_USER_RESOURCE +asmlinkage long sys_getluid(void) +{ + return -ENOSYS; +} + +asmlinkage long sys_setluid(uid_t uid) +{ + return -ENOSYS; +} + +asmlinkage long sys_setublimit(uid_t uid, unsigned long resource, + unsigned long *limits) +{ + return -ENOSYS; +} +#else /* CONFIG_USER_RESOURCE */ + +/* + * The (rather boring) getluid syscall + */ +asmlinkage long sys_getluid(void) +{ + struct user_beancounter *ub; + + ub = get_exec_ub(); + if (ub == NULL) + return -EINVAL; + + return ub->ub_uid; +} + +/* + * The setluid syscall + */ +asmlinkage long sys_setluid(uid_t uid) +{ + int error; + struct user_beancounter *ub; + struct task_beancounter *task_bc; + + task_bc = ¤t->task_bc; + + /* You may not disown a setluid */ + error = -EINVAL; + if (uid == (uid_t)-1) + goto out; + + /* You may only set an ub as root */ + error = -EPERM; + if (!capable(CAP_SETUID)) + goto out; + + /* Ok - set up a beancounter entry for this user */ + error = -ENOBUFS; + ub = beancounter_findcreate(uid, NULL, UB_ALLOC); + if (ub == NULL) + goto out; + + /* install bc */ + put_beancounter(task_bc->exec_ub); + task_bc->exec_ub = ub; + put_beancounter(task_bc->fork_sub); + task_bc->fork_sub = get_beancounter(ub); + error = 0; +out: + return error; +} + +/* + * The setbeanlimit syscall + */ +asmlinkage long sys_setublimit(uid_t uid, unsigned long resource, + unsigned long *limits) +{ + int error; + unsigned long flags; + struct user_beancounter *ub; + unsigned long new_limits[2]; + + error = -EPERM; + if(!capable(CAP_SYS_RESOURCE)) + goto out; + + error = -EINVAL; + if (resource >= UB_RESOURCES) + goto out; + + error = -EFAULT; + if (copy_from_user(&new_limits, limits, sizeof(new_limits))) + goto out; + + error = -EINVAL; + if (new_limits[0] > UB_MAXVALUE || new_limits[1] > UB_MAXVALUE) + goto out; + + error = -ENOENT; + ub = beancounter_findcreate(uid, NULL, 0); + if (ub == NULL) + goto out; + + spin_lock_irqsave(&ub->ub_lock, flags); + ub->ub_parms[resource].barrier = new_limits[0]; + ub->ub_parms[resource].limit = new_limits[1]; + spin_unlock_irqrestore(&ub->ub_lock, flags); + + put_beancounter(ub); + error = 0; +out: + return error; +} +#endif - To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/