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home:dirkmueller:acdc:as_python3_module
xen.32204
xsa443-11.patch
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File xsa443-11.patch of Package xen.32204
From 273cc7ecf0a66334f24f6f740bcd441b542b3323 Mon Sep 17 00:00:00 2001 From: Roger Pau Monne <roger.pau@citrix.com> Date: Thu, 28 Sep 2023 12:22:35 +0200 Subject: [PATCH 11/11] libxl: limit bootloader execution in restricted mode MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Introduce a timeout for bootloader execution when running in restricted mode. Allow overwriting the default time out with an environment provided value. This is part of XSA-443 / CVE-2023-34325 Signed-off-by: Roger Pau Monné <roger.pau@citrix.com> Reviewed-by: Anthony PERARD <anthony.perard@citrix.com> --- docs/man/xl.1.pod.in | 8 ++++++ tools/libxl/libxl_bootloader.c | 40 +++++++++++++++++++++++++++++ tools/libxl/libxl_internal.h | 2 ++ 3 files changed, 50 insertions(+) --- a/docs/man/xl.1.pod.in +++ b/docs/man/xl.1.pod.in @@ -1999,6 +1999,14 @@ NOTE: Each domain MUST have a SEPARATE u See docs/features/qemu-deprivilege.pandoc for more information. +=item LIBXL_BOOTLOADER_TIMEOUT + +Timeout in seconds for bootloader execution when running in restricted mode. +Otherwise the build time default in LIBXL_BOOTLOADER_TIMEOUT will be used. + +If defined the value must be an unsigned integer between 0 and INT_MAX, +otherwise behavior is undefined. Setting to 0 disables the timeout. + =back =head1 SEE ALSO --- a/tools/libxl/libxl_bootloader.c +++ b/tools/libxl/libxl_bootloader.c @@ -34,6 +34,8 @@ static void bootloader_keystrokes_copyfa libxl__datacopier_state *dc, int rc, int onwrite, int errnoval); static void bootloader_display_copyfail(libxl__egc *egc, libxl__datacopier_state *dc, int rc, int onwrite, int errnoval); +static void bootloader_timeout(libxl__egc *egc, libxl__ev_time *ev, + const struct timeval *requested_abs, int rc); static void bootloader_domaindeath(libxl__egc*, libxl__domaindeathcheck *dc, int rc); static void bootloader_finished(libxl__egc *egc, libxl__ev_child *child, @@ -301,6 +303,7 @@ void libxl__bootloader_init(libxl__bootl bl->ptys[0].master = bl->ptys[0].slave = 0; bl->ptys[1].master = bl->ptys[1].slave = 0; libxl__ev_child_init(&bl->child); + libxl__ev_time_init(&bl->time); libxl__domaindeathcheck_init(&bl->deathcheck); bl->keystrokes.ao = bl->ao; libxl__datacopier_init(&bl->keystrokes); bl->display.ao = bl->ao; libxl__datacopier_init(&bl->display); @@ -318,6 +321,7 @@ static void bootloader_cleanup(libxl__eg libxl__domaindeathcheck_stop(gc,&bl->deathcheck); libxl__datacopier_kill(&bl->keystrokes); libxl__datacopier_kill(&bl->display); + libxl__ev_time_deregister(gc, &bl->time); for (i=0; i<2; i++) { libxl__carefd_close(bl->ptys[i].master); libxl__carefd_close(bl->ptys[i].slave); @@ -379,6 +383,7 @@ static void bootloader_stop(libxl__egc * libxl__datacopier_kill(&bl->keystrokes); libxl__datacopier_kill(&bl->display); + libxl__ev_time_deregister(gc, &bl->time); if (libxl__ev_child_inuse(&bl->child)) { r = kill(bl->child.pid, SIGTERM); if (r) LOGED(WARN, bl->domid, "%sfailed to kill bootloader [%lu]", @@ -641,6 +646,25 @@ static void bootloader_gotptys(libxl__eg struct termios termattr; + if (getenv("LIBXL_BOOTLOADER_RESTRICT") || + getenv("LIBXL_BOOTLOADER_USER")) { + const char *timeout_env = getenv("LIBXL_BOOTLOADER_TIMEOUT"); + int timeout = timeout_env ? atoi(timeout_env) + : LIBXL_BOOTLOADER_TIMEOUT; + + if (timeout) { + /* Set execution timeout */ + rc = libxl__ev_time_register_rel(ao, &bl->time, + bootloader_timeout, + timeout * 1000); + if (rc) { + LOGED(ERROR, bl->domid, + "unable to register timeout for bootloader execution"); + goto out; + } + } + } + pid_t pid = libxl__ev_child_fork(gc, &bl->child, bootloader_finished); if (pid == -1) { rc = ERROR_FAIL; @@ -706,6 +730,21 @@ static void bootloader_display_copyfail( libxl__bootloader_state *bl = CONTAINER_OF(dc, *bl, display); bootloader_copyfail(egc, "bootloader output", bl, 1, rc,onwrite,errnoval); } +static void bootloader_timeout(libxl__egc *egc, libxl__ev_time *ev, + const struct timeval *requested_abs, int rc) +{ + libxl__bootloader_state *bl = CONTAINER_OF(ev, *bl, time); + STATE_AO_GC(bl->ao); + + libxl__ev_time_deregister(gc, &bl->time); + + assert(libxl__ev_child_inuse(&bl->child)); + LOGD(ERROR, bl->domid, "killing bootloader because of timeout"); + + libxl__ev_child_kill_deregister(ao, &bl->child, SIGKILL); + + bootloader_callback(egc, bl, rc); +} static void bootloader_domaindeath(libxl__egc *egc, libxl__domaindeathcheck *dc, @@ -722,6 +761,7 @@ static void bootloader_finished(libxl__e STATE_AO_GC(bl->ao); int rc; + libxl__ev_time_deregister(gc, &bl->time); libxl__datacopier_kill(&bl->keystrokes); libxl__datacopier_kill(&bl->display); --- a/tools/libxl/libxl_internal.h +++ b/tools/libxl/libxl_internal.h @@ -104,6 +104,7 @@ #define LIBXL_QMP_CMD_TIMEOUT 10 #define LIBXL_STUBDOM_START_TIMEOUT 30 #define LIBXL_QEMU_BODGE_TIMEOUT 2 +#define LIBXL_BOOTLOADER_TIMEOUT 120 #define LIBXL_XENCONSOLE_LIMIT 1048576 #define LIBXL_XENCONSOLE_PROTOCOL "vt100" #define LIBXL_MAXMEM_CONSTANT 1024 @@ -3728,6 +3729,7 @@ struct libxl__bootloader_state { libxl__openpty_state openpty; libxl__openpty_result ptys[2]; /* [0] is for bootloader */ libxl__ev_child child; + libxl__ev_time time; libxl__domaindeathcheck deathcheck; int nargs, argsspace; const char **args;
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