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XAPI wil permisions issues
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| xapi: [debug|john-centos|0 thread_zero|dbsync (update_env) D:de0894b753b1|mscgen] xapi=>xenops [label="HOST.get_total_memory_mib"]; | |
| xenopsd: [debug|john-centos|13|read_localhost_info|xenops] HOST.get_total_memory_mib | |
| [debug|john-centos|0 thread_zero|dbsync (update_env) D:de0894b753b1|xenops] read_one_line for /root/testfile | |
| [debug|john-centos|0 thread_zero|dbsync (update_env) D:de0894b753b1|xenops] opened /root/testfile | |
| [debug|john-centos|0 thread_zero|dbsync (update_env) D:de0894b753b1|xenops] closed /root/testfile | |
| [debug|john-centos|0 thread_zero|dbsync (update_env) D:de0894b753b1|xenops] got file content asdfasdf | |
| [debug|john-centos|0 thread_zero|dbsync (update_env) D:de0894b753b1|xenops] XXXXX about to open file XXXXX /sys/devices/system/xen_memory/xen_memory0/info/current_kb | |
| [debug|john-centos|0 thread_zero|dbsync (update_env) D:de0894b753b1|xenops] read_one_line for /sys/devices/system/xen_memory/xen_memory0/info/current_kb | |
| [debug|john-centos|0 thread_zero|dbsync (update_env) D:de0894b753b1|backtrace] Raised at pervasives.ml:289.20-46 -> balloon.ml:33.14-26 -> balloon.ml:59.13-47 -> list.ml:57.20-23 -> create_misc.ml:71.12-45 -> dbsync_slave.ml:225.13-47 -> dbsync.ml:62.7-53 -> server_helpers.ml:75.11-23 | |
| [debug|john-centos|0 thread_zero|dbsync (update_env) D:de0894b753b1|dispatcher] Server_helpers.exec exception_handler: Got exception INTERNAL_ERROR: [ Sys_error("/sys/devices/system/xen_memory/xen_memory0/info/current_kb: Permission denied") ] |
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| sendto(4, "<175>Mar 2 22:39:09 xapi: [debug|john-centos|0 thread_zero|dbsync (update_env) D:0992c2cf8bd6|xenops] read_one_line for /root/testfile", 135, MSG_NOSIGNAL, NULL, 0) = 135 | |
| lstat("/root/testfile", {st_dev=makedev(253, 0), st_ino=264551, st_mode=S_IFREG|0444, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=8, st_size=9, st_atime=2013/03/02-20:44:31, st_mtime=2013/03/02-20:44:13, st_ctime=2013/03/02-20:44:23}) = 0 | |
| open("/root/testfile", O_RDONLY) = 13 | |
| fcntl(13, F_SETFD, FD_CLOEXEC) = 0 | |
| lseek(13, 0, SEEK_CUR) = 0 | |
| sendto(4, "<175>Mar 2 22:39:09 xapi: [debug|john-centos|0 thread_zero|dbsync (update_env) D:0992c2cf8bd6|xenops] opened /root/testfile", 124, MSG_NOSIGNAL, NULL, 0) = 124 | |
| read(13, "asdfasdf\n", 65536) = 9 | |
| close(13) = 0 | |
| sendto(4, "<175>Mar 2 22:39:09 xapi: [debug|john-centos|0 thread_zero|dbsync (update_env) D:0992c2cf8bd6|xenops] closed /root/testfile", 124, MSG_NOSIGNAL, NULL, 0) = 124 | |
| sendto(4, "<175>Mar 2 22:39:09 xapi: [debug|john-centos|0 thread_zero|dbsync (update_env) D:0992c2cf8bd6|xenops] got file content asdfasdf", 128, MSG_NOSIGNAL, NULL, 0) = 128 | |
| sendto(4, "<175>Mar 2 22:39:09 xapi: [debug|john-centos|0 thread_zero|dbsync (update_env) D:0992c2cf8bd6|xenops] XXXXX about to open file XXXXX /sys/devices/system/xen_memory/xen_memory0/info/current_kb", 192, MSG_NOSIGNAL, NULL, 0) = 192 | |
| sendto(4, "<175>Mar 2 22:39:09 xapi: [debug|john-centos|0 thread_zero|dbsync (update_env) D:0992c2cf8bd6|xenops] read_one_line for /sys/devices/system/xen_memory/xen_memory0/info/current_kb", 179, MSG_NOSIGNAL, NULL, 0) = 179 | |
| lstat("/sys/devices/system/xen_memory/xen_memory0/info/current_kb", {st_dev=makedev(0, 16), st_ino=3878, st_mode=S_IFREG|0444, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=0, st_size=4096, st_atime=2013/03/02-19:50:22, st_mtime=2013/03/02-19:50:22, st_ctime=2013/03/02-19:53:54}) = 0 | |
| stat("/sys/devices/system/xen_memory/xen_memory0/info/current_kb", {st_dev=makedev(0, 16), st_ino=3878, st_mode=S_IFREG|0444, st_nlink=1, st_uid=0, st_gid=0, st_blksize=4096, st_blocks=0, st_size=4096, st_atime=2013/03/02-19:50:22, st_mtime=2013/03/02-19:50:22, st_ctime=2013/03/02-19:53:54}) = 0 | |
| access("/sys/devices/system/xen_memory/xen_memory0/info/current_kb", W_OK) = 0 | |
| open("/sys/devices/system/xen_memory/xen_memory0/info/current_kb", O_RDWR) = -1 EACCES (Permission denied) | |
| sendto(4, "<175>Mar 2 22:39:09 xapi: [debug|john-centos|0 thread_zero|dbsync (update_env) D:0992c2cf8bd6|backtrace] Raised at pervasives.ml:289.20-46 -> balloon.ml:33.14-26 -> balloon.ml:59.13-47 -> list.ml:57.20-23 -> create_misc.ml:71.12-45 -> dbsync_slave.m"..., 312, MSG_NOSIGNAL, NULL, 0) = 312 | |
| sendto(4, "<175>Mar 2 22:39:09 xapi: [debug|john-centos|0 thread_zero|dbsync (update_env) D:0992c2cf8bd6|dispatcher] Server_helpers.exec exception_handler: Got exception INTERNAL_ERROR: [ Sys_error(\"/sys/devices/system/xen_memory/xen_memory0/info/current_kb: P"..., 270, MSG_NOSIGNAL, NULL, 0) = 270 |
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| (* | |
| * Copyright (C) 2006-2009 Citrix Systems Inc. | |
| * | |
| * This program is free software; you can redistribute it and/or modify | |
| * it under the terms of the GNU Lesser General Public License as published | |
| * by the Free Software Foundation; version 2.1 only. with the special | |
| * exception on linking described in file LICENSE. | |
| * | |
| * This program is distributed in the hope that it will be useful, | |
| * but WITHOUT ANY WARRANTY; without even the implied warranty of | |
| * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
| * GNU Lesser General Public License for more details. | |
| *) | |
| open Stringext | |
| open Printf | |
| open Xenstore | |
| module D = Debug.Debugger(struct let name = "xenops" end) | |
| open D | |
| let sysfs_stem = "/sys/devices/system/xen_memory/xen_memory0/" | |
| let _current_allocation = "info/current_kb" | |
| let _requested_target = "target_kb" | |
| let _low_mem_balloon = "info/low_kb" | |
| let _high_mem_balloon = "info/high_kb" | |
| (** Indicates whether or not we're running with XIU (Xen-In Userspace) *) | |
| let on_xiu () = Xenctrl.is_fake () | |
| let read_one_line file = | |
| debug "read_one_line for %s" file; | |
| let inchan = open_in file in | |
| try | |
| debug "opened %s" file; | |
| let result = input_line inchan in | |
| close_in inchan; | |
| debug "closed %s" file; | |
| result | |
| with exn -> close_in inchan; raise exn;; | |
| (** Reads /proc/xen/balloon into a string * int64 option association list *) | |
| let parse_proc_xen_balloon () = | |
| if on_xiu () then | |
| [ _current_allocation, Some 100L; | |
| _requested_target, Some 100L; | |
| _low_mem_balloon, Some 100L; | |
| _high_mem_balloon, Some 100L;] | |
| else | |
| let keys = [ | |
| _current_allocation; | |
| _requested_target; | |
| _low_mem_balloon; | |
| _high_mem_balloon] in | |
| List.map (fun key -> | |
| let test = (read_one_line "/root/testfile") in | |
| debug "got file content %s" test; | |
| debug "XXXXX about to open file XXXXX %s" (sysfs_stem ^ key); | |
| let s = (read_one_line (sysfs_stem ^ key)) in | |
| let stripped = Stringext.String.strip Stringext.String.isspace s in | |
| (key, Some (Int64.of_string stripped))) keys | |
| (** (key, Some 1048576L)) keys **) | |
This
access("/sys/devices/system/xen_memory/xen_memory0/info/current_kb", W_OK) = 0
is odd -- according to access(2) this means that the calling process has write permission (which it shouldn't have!)
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