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restore: Dump current VMAs

Browse source 
Restorer needs to know which VMAs
to unmap before map a new set.

Signed-off-by: Cyrill Gorcunov <gorcunov@gmail.com>
This commit is contained in:
Cyrill Gorcunov 2011-10-26 22:50:46 +04:00
parent 2cc7488de2
commit aaf3291e00
3 changed files with 38 additions and 4 deletions
Download patch file Download diff file Expand all files Collapse all files

32
cr-restore.c
View file

@ -1229,6 +1229,33 @@ static void restorer_test(pid_t pid)
restorer_fcall_t restorer_fcall;
char path[64];
LIST_HEAD(self_vma_list);
struct vma_area *vma_area;
int fd_vmas, num;
if (parse_maps(getpid(), &self_vma_list, false))
goto err;
snprintf(path, sizeof(path), "vmas-%d.img", getpid());
unlink(path);
fd_vmas = open(path, O_CREAT | O_WRONLY, CR_FD_PERM);
if (fd_vmas < 0) {
pr_perror("Can't open %s\n", path);
}
num = 0;
list_for_each_entry(vma_area, &self_vma_list, list) {
ret = write(fd_vmas, &vma_area->vma, sizeof(vma_area->vma));
if (ret != sizeof(vma_area->vma)) {
pr_perror("\nUnable to write vma entry (%li written)\n", num);
goto err;
}
num++;
}
free_mappings(&self_vma_list);
close(fd_vmas);
restorer_fcall = restorer;
code_len = restorer_fcall(RESTORER_CMD__GET_SELF_LEN) - (long)restorer;
args_offset = restorer_fcall(RESTORER_CMD__GET_ARG_OFFSET) - (long)restorer;
@ -1265,10 +1292,12 @@ static void restorer_test(pid_t pid)
/*
* Pass arguments and run a command.
*/
snprintf(path, sizeof(path), "core-%d.img", pid);
args = (struct restore_core_args *)(exec_start + args_offset);
args->self_entry = exec_mem;
args->self_size = vma_len;
strcpy(args->self_vmas_path, path);
snprintf(path, sizeof(path), "core-%d.img", pid);
strcpy(args->core_path, path);
/*
@ -1285,6 +1314,7 @@ static void restorer_test(pid_t pid)
: "g"(new_sp), "g"(exec_start)
: "rsp", "rdi", "rbx", "rax", "memory");
err:
/* Just to be sure */
sys_exit(0);
}

7
include/restorer.h
View file

@ -20,9 +20,10 @@ typedef long (*restorer_fcall_t) (long cmd);
#define RESTORER_CMD__RESTORE_CORE 4
struct restore_core_args {
void *self_entry; /* restorer placed at */
long self_size; /* size for restorer granted */
char core_path[0]; /* path to a core file */
void *self_entry; /* restorer placed at */
long self_size; /* size for restorer granted */
char core_path[64]; /* path to a core file */
char self_vmas_path[64]; /* path to a self-vmas file */
};
struct rt_sigframe {

3
restorer.c
View file

@ -95,6 +95,9 @@ self_len_end:
write_string(args->core_path);
write_string("\n");
write_string(args->self_vmas_path);
write_string("\n");
fd_core = sys_open(args->core_path, O_RDONLY, CR_FD_PERM);
if (fd_core < 0)
return fd_core;