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parasite: Pass exec start point to parasite_prep_ctl

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The parasite_prep_ctl() will become compel call, so it won't
have the code that scans CRIU's vma area list. For pure compel
users we'll need to add simple /proc/maps scanner that'd find
the entry point.

Signed-off-by: Pavel Emelyanov <xemul@virtuozzo.com>
This commit is contained in:
Pavel Emelyanov
2016-09-26 13:20:00 +03:00
parent c158ccdf23
commit 78a3670ba8
4 changed files with 22 additions and 19 deletions
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9
criu/cr-exec.c
View File

@@ -120,6 +120,7 @@ int cr_exec(int pid, char **opt)
struct vm_area_list vmas;
int ret, prev_state, exit_code = -1;
struct proc_status_creds *creds = NULL;
unsigned long p_start;
if (!sys_name) {
pr_err("Syscall name required\n");
@@ -159,7 +160,13 @@ int cr_exec(int pid, char **opt)
goto out_unseize;
}
ctl = parasite_prep_ctl(pid, &vmas);
p_start = get_exec_start(&vmas);
if (!p_start) {
pr_err("No suitable VM are found\n");
goto out_unseize;
}
ctl = parasite_prep_ctl(pid, p_start);
if (!ctl) {
pr_err("Can't prep ctl %d\n", pid);
goto out_unseize;

2
criu/cr-restore.c
View File

@@ -1536,7 +1536,7 @@ static void finalize_restore(void)
continue;
/* Unmap the restorer blob */
ctl = parasite_prep_ctl(pid, NULL);
ctl = parasite_prep_ctl(pid, 0);
if (ctl == NULL)
continue;

4
criu/include/parasite-syscall.h
View File

@@ -99,8 +99,8 @@ extern struct parasite_ctl *parasite_infect_seized(pid_t pid,
struct pstree_item *item,
struct vm_area_list *vma_area_list);
extern void parasite_ensure_args_size(unsigned long sz);
extern struct parasite_ctl *parasite_prep_ctl(pid_t pid,
struct vm_area_list *vma_area_list);
extern unsigned long get_exec_start(struct vm_area_list *);
extern struct parasite_ctl *parasite_prep_ctl(pid_t pid, unsigned long exec_start);
extern int parasite_map_exchange(struct parasite_ctl *ctl, unsigned long size);
extern int parasite_dump_cgroup(struct parasite_ctl *ctl, struct parasite_dump_cgroup_args *cgroup);

26
criu/parasite-syscall.c
View File

@@ -44,11 +44,11 @@
#define MEMFD_FNAME "CRIUMFD"
#define MEMFD_FNAME_SZ sizeof(MEMFD_FNAME)
static unsigned long get_exec_start(struct list_head *vma_area_list)
unsigned long get_exec_start(struct vm_area_list *vmas)
{
struct vma_area *vma_area;
list_for_each_entry(vma_area, vma_area_list, list) {
list_for_each_entry(vma_area, &vmas->h, list) {
unsigned long len;
if (vma_area->e->start >= kdat.task_size)
@@ -1144,7 +1144,7 @@ err:
}
/* If vma_area_list is NULL, a place for injecting syscall will not be set. */
struct parasite_ctl *parasite_prep_ctl(pid_t pid, struct vm_area_list *vma_area_list)
struct parasite_ctl *parasite_prep_ctl(pid_t pid, unsigned long exec_start)
{
struct parasite_ctl *ctl = NULL;
@@ -1168,17 +1168,7 @@ struct parasite_ctl *parasite_prep_ctl(pid_t pid, struct vm_area_list *vma_area_
ctl->pid.real = pid;
ctl->pid.virt = 0;
if (vma_area_list == NULL)
return ctl;
/* Search a place for injecting syscall */
ctl->syscall_ip = get_exec_start(&vma_area_list->h);
if (!ctl->syscall_ip) {
pr_err("No suitable VMA found to run parasite "
"bootstrap code (pid: %d)\n", pid);
goto err;
}
ctl->syscall_ip = exec_start;
pr_debug("Parasite syscall_ip at %p\n", (void *)ctl->syscall_ip);
return ctl;
@@ -1365,7 +1355,13 @@ struct parasite_ctl *parasite_infect_seized(pid_t pid, struct pstree_item *item,
BUG_ON(item->threads[0].real != pid);
ctl = parasite_prep_ctl(pid, vma_area_list);
p = get_exec_start(vma_area_list);
if (!p) {
pr_err("No suitable VM found\n");
return NULL;
}
ctl = parasite_prep_ctl(pid, p);
if (!ctl)
return NULL;