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parasite: prep_ctl doesn't search place for syscall if vma_list is NULL

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Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrey Vagin 2013-09-23 14:33:28 +04:00 • committed by Pavel Emelyanov
parent f9f690262c
commit 6382ec4e66
1 changed files with 10 additions and 2 deletions
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12
parasite-syscall.c
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@ -885,6 +885,9 @@ int parasite_cure_seized(struct parasite_ctl *ctl)
return ret;
}
/*
* 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 *ctl = NULL;
@ -914,6 +917,13 @@ struct parasite_ctl *parasite_prep_ctl(pid_t pid, struct vm_area_list *vma_area_
goto err;
}
ctl->pid.real = pid;
ctl->pid.virt = 0;
if (vma_area_list == NULL)
return ctl;
/* Search a place for injecting syscall */
vma_area = get_vma_by_ip(&vma_area_list->h, REG_IP(ctl->regs_orig));
if (!vma_area) {
pr_err("No suitable VMA found to run parasite "
@ -921,8 +931,6 @@ struct parasite_ctl *parasite_prep_ctl(pid_t pid, struct vm_area_list *vma_area_
goto err;
}
ctl->pid.real = pid;
ctl->pid.virt = 0;
ctl->syscall_ip = vma_area->vma.start;
return ctl;