[Devel] [PATCH 1/1] restart: accept the lsm_name field in header and add -k flag (v2)
Serge E. Hallyn
serue at us.ibm.com
Mon Oct 5 14:58:52 PDT 2009
[ Oren: I added your ack since you sent it to the previous
patch, but this patch changed quite a bit - maybe I shouldn't
have put the ack in after all, but please take another look ]
The checkpoint file header now has an 11-character string
containing the name of the active LSM, following the uts
info, and a variable length buffer type conaining LSM-specific
version information (for instance a sha1sum of policy).
Handle these.
Also add a -k (--keeplsm) flag to tell restart to set the
RESTART_KEEP_LSM flag to sys_restart().
Changelog:
oct 05: 1. move keep_lsm into arg struct
2. read a separate container config section
3. use CHECKPOINT_LSM_NAME_MAX
Signed-off-by: Serge E. Hallyn <serue at us.ibm.com>
Acked-by: Oren Laadan <orenl at cs.columbia.edu>
---
restart.c | 66 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
1 files changed, 64 insertions(+), 2 deletions(-)
diff --git a/restart.c b/restart.c
index c3f4349..d8409c4 100644
--- a/restart.c
+++ b/restart.c
@@ -34,7 +34,6 @@
#include <linux/checkpoint.h>
#include <linux/checkpoint_hdr.h>
-
/* this really belongs to some kernel header ! */
struct pid_set {
int num_pids;
@@ -68,6 +67,7 @@ static char usage_str[] =
" --signal=SIG send SIG to root task on SIGINT (default: SIGKILL\n"
" to container root, SIGINT otherwise)\n"
" -w,--wait wait for root task to termiate (default)\n"
+" -k,--keeplsm Try to recreate original LSM labels on all objects\n"
" --show-status show exit status of root task (implies -w)\n"
" --copy-status imitate exit status of root task (implies -w)\n"
" -W,--no-wait do not wait for root task to terminate\n"
@@ -264,6 +264,7 @@ struct ckpt_ctx {
char header[BUFSIZE];
char header_arch[BUFSIZE];
+ char container[BUFSIZE];
char tree[BUFSIZE];
char buf[BUFSIZE];
struct args *args;
@@ -303,6 +304,7 @@ static int ckpt_write_obj(struct ckpt_ctx *ctx, struct ckpt_hdr *h);
static int ckpt_write_header(struct ckpt_ctx *ctx);
static int ckpt_write_header_arch(struct ckpt_ctx *ctx);
+static int ckpt_write_container(struct ckpt_ctx *ctx);
static int ckpt_write_tree(struct ckpt_ctx *ctx);
static int _ckpt_read(int fd, void *buf, int count);
@@ -313,6 +315,7 @@ static int ckpt_read_obj_type(struct ckpt_ctx *ctx, void *b, int n, int type);
static int ckpt_read_header(struct ckpt_ctx *ctx);
static int ckpt_read_header_arch(struct ckpt_ctx *ctx);
+static int ckpt_read_container(struct ckpt_ctx *ctx);
static int ckpt_read_tree(struct ckpt_ctx *ctx);
static int hash_init(struct ckpt_ctx *ctx);
@@ -347,6 +350,7 @@ struct args {
int copy_status;
char *freezer;
char *input;
+ int keep_lsm;
};
static void usage(char *str)
@@ -377,6 +381,7 @@ static void parse_args(struct args *args, int argc, char *argv[])
{ "self", no_argument, NULL, 6},
{ "signal", required_argument, NULL, 4 },
{ "inspect", no_argument, NULL, 5 },
+ { "keeplsm", no_argument, NULL, 'k' },
{ "input", required_argument, NULL, 'i' },
{ "root", required_argument, NULL, 'r' },
{ "wait", no_argument, NULL, 'w' },
@@ -388,7 +393,7 @@ static void parse_args(struct args *args, int argc, char *argv[])
{ "debug", no_argument, NULL, 'd' },
{ NULL, 0, NULL, 0 }
};
- static char optc[] = "hdvpPwWF:r:i:";
+ static char optc[] = "hdvpkPwWF:r:i:";
int sig;
@@ -443,6 +448,9 @@ static void parse_args(struct args *args, int argc, char *argv[])
case 'w':
args->wait = 1;
break;
+ case 'k':
+ args->keep_lsm = RESTART_KEEP_LSM;
+ break;
case 'W':
args->wait = 0;
break;
@@ -693,6 +701,12 @@ int main(int argc, char *argv[])
exit(1);
}
+ ret = ckpt_read_container(&ctx);
+ if (ret < 0) {
+ perror("read c/r container section");
+ exit(1);
+ }
+
ret = ckpt_read_tree(&ctx);
if (ret < 0) {
perror("read c/r tree");
@@ -927,6 +941,7 @@ static int ckpt_coordinator(struct ckpt_ctx *ctx)
if (ctx->args->freezer)
flags |= RESTART_FROZEN;
+ flags |= ctx->args->keep_lsm;
ret = restart(root_pid, STDIN_FILENO, flags);
if (ret < 0) {
@@ -1575,6 +1590,7 @@ static int ckpt_make_tree(struct ckpt_ctx *ctx, struct task *task)
if (task->flags & (TASK_GHOST | TASK_DEAD))
flags |= RESTART_GHOST;
+ flags |= ctx->args->keep_lsm;
/* on success this doesn't return */
ckpt_dbg("about to call sys_restart(), flags %#lx\n", flags);
ret = restart(0, STDIN_FILENO, flags);
@@ -1850,6 +1866,9 @@ static int ckpt_do_feeder(void *data)
if (ckpt_write_header_arch(ctx) < 0)
ckpt_abort(ctx, "write c/r header arch");
+ if (ckpt_write_container(ctx) < 0)
+ ckpt_abort(ctx, "write container section");
+
if (ckpt_write_tree(ctx) < 0)
ckpt_abort(ctx, "write c/r tree");
@@ -2102,6 +2121,27 @@ static int ckpt_read_header_arch(struct ckpt_ctx *ctx)
return 0;
}
+static int ckpt_read_container(struct ckpt_ctx *ctx)
+{
+ int ret;
+ struct ckpt_hdr_container *h;
+ char *ptr;
+
+ h = (struct ckpt_hdr_container *) ctx->container;
+ ret = ckpt_read_obj_type(ctx, h, sizeof(*h), CKPT_HDR_CONTAINER);
+ if (ret < 0)
+ return ret;
+
+ ptr = (char *) h;
+ ptr += ((struct ckpt_hdr *) ptr)->len;
+ ret = ckpt_read_obj_buffer(ctx, ptr, CHECKPOINT_LSM_NAME_MAX + 1);
+ if (ret < 0)
+ return ret;
+
+ ptr += ((struct ckpt_hdr *) ptr)->len;
+ return ckpt_read_obj_type(ctx, ptr, 200, CKPT_HDR_LSM_INFO);
+}
+
static int ckpt_read_tree(struct ckpt_ctx *ctx)
{
struct ckpt_hdr_tree *h;
@@ -2174,6 +2214,28 @@ static int ckpt_write_header_arch(struct ckpt_ctx *ctx)
return ckpt_write_obj(ctx, (struct ckpt_hdr *) h);
}
+static int ckpt_write_container(struct ckpt_ctx *ctx)
+{
+ char *ptr;
+ int ret;
+
+ ptr = (char *) ctx->container;
+ /* write the container info section */
+ ret = ckpt_write_obj(ctx, (struct ckpt_hdr *) ptr);
+ if (ret < 0)
+ return ret;
+
+ /* write the lsm name buffer */
+ ptr += ((struct ckpt_hdr *) ptr)->len;
+ ret = ckpt_write_obj(ctx, (struct ckpt_hdr *) ptr);
+ if (ret < 0)
+ return ret;
+
+ /* write the lsm policy section */
+ ptr += ((struct ckpt_hdr *) ptr)->len;
+ return ckpt_write_obj(ctx, (struct ckpt_hdr *) ptr);
+}
+
static int ckpt_write_tree(struct ckpt_ctx *ctx)
{
struct ckpt_hdr_tree *h;
--
1.6.1.1
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