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().
Signed-off-by: Serge E. Hallyn <serue@xxxxxxxxxx>
---
restart.c | 32 +++++++++++++++++++++++++++++++-
1 files changed, 31 insertions(+), 1 deletions(-)
diff --git a/restart.c b/restart.c
index b810ca9..44ae252 100644
--- a/restart.c
+++ b/restart.c
@@ -68,6 +68,7 @@ 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"
@@ -349,6 +350,8 @@ struct args {
char *input;
};
+int keep_lsm;
+
static void usage(char *str)
{
fprintf(stderr, "%s", str);
@@ -377,6 +380,7 @@ 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 +392,7 @@ 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 +447,9 @@ static void parse_args(struct args *args, int argc, char *argv[])
case 'w':
args->wait = 1;
break;
+ case 'k':
+ keep_lsm = RESTART_KEEP_LSM;
+ break;
case 'W':
args->wait = 0;
break;
@@ -927,6 +934,7 @@ static int ckpt_coordinator(struct ckpt_ctx *ctx)
if (ctx->args->freezer)
flags |= RESTART_FROZEN;
+ flags |= keep_lsm;
ret = restart(root_pid, STDIN_FILENO, flags);
if (ret < 0) {
@@ -1581,6 +1589,7 @@ static int ckpt_make_tree(struct ckpt_ctx *ctx, struct task *task)
if (task->flags & (TASK_GHOST | TASK_DEAD))
flags |= RESTART_GHOST;
+ flags |= 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);
@@ -2057,6 +2066,7 @@ static int ckpt_read_obj_buffer(struct ckpt_ctx *ctx, void *buf, int n)
* read/write the checkpoint image: similar to in-kernel code
*/
+#define SECURITY_NAME_MAX 20
static int ckpt_read_header(struct ckpt_ctx *ctx)
{
struct ckpt_hdr_header *h;
@@ -2090,6 +2100,16 @@ static int ckpt_read_header(struct ckpt_ctx *ctx)
if (ret < 0)
return ret;
+ ptr += ((struct ckpt_hdr *) ptr)->len;
+ ret = ckpt_read_obj_buffer(ctx, ptr, SECURITY_NAME_MAX + 1);
+ if (ret < 0)
+ return ret;
+
+ ptr += ((struct ckpt_hdr *) ptr)->len;
+ ret = ckpt_read_obj_type(ctx, ptr, 200, CKPT_HDR_LSM_INFO);
+ if (ret < 0)
+ return ret;
+
/* FIXME: skip version validation for now */
return 0;
@@ -2169,6 +2189,16 @@ static int ckpt_write_header(struct ckpt_ctx *ctx)
ptr += ((struct ckpt_hdr *) ptr)->len;
ret = ckpt_write_obj(ctx, (struct ckpt_hdr *) ptr);
+ if (ret < 0)
+ return ret;
+ ptr += ((struct ckpt_hdr *) ptr)->len;
+ ret = ckpt_write_obj(ctx, (struct ckpt_hdr *) ptr);
+ if (ret < 0)
+ return ret;
+
+ ptr += ((struct ckpt_hdr *) ptr)->len;
+ ret = ckpt_write_obj(ctx, (struct ckpt_hdr *) ptr);
+
return ret;
}
--
1.6.1.1
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