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parasite: Enlighten parasite cmd/adg injection

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Since we now have the parasite memory shared with crtools process we
can just memcpy this data between them.

Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
Signed-off-by: Cyrill Gorcunov <gorcunov@openvz.org>
This commit is contained in:
Pavel Emelyanov
2012-02-12 14:51:38 +04:00
committed by Cyrill Gorcunov
parent 354ab03a67
commit e6823c274e
2 changed files with 9 additions and 19 deletions
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4
include/parasite-syscall.h
View File

@@ -18,8 +18,8 @@ struct parasite_ctl {
void * local_map;
unsigned long map_length;
unsigned long parasite_ip; /* service routine start ip */
unsigned long addr_cmd; /* addr for command */
unsigned long addr_args; /* address for arguments */
void * addr_cmd; /* addr for command */
void * addr_args; /* address for arguments */
};
extern int can_run_syscall(unsigned long ip, unsigned long start, unsigned long end);

24
parasite-syscall.c
View File

@@ -199,19 +199,13 @@ int parasite_execute(unsigned long cmd, struct parasite_ctl *ctl,
/*
* Pass the command first, it's immutable.
*/
jerr(ptrace_poke_area((long)ctl->pid, (void *)&cmd, (void *)ctl->addr_cmd,
sizeof(cmd)), err_restore);
memcpy(ctl->addr_cmd, &cmd, sizeof(cmd));
again:
regs = regs_orig;
regs.ip = ctl->parasite_ip;
jerr(ptrace(PTRACE_SETREGS, ctl->pid, NULL, &regs), err_restore);
if (ptrace_poke_area((long)ctl->pid, (void *)args,
(void *)ctl->addr_args, args_size)) {
pr_err("Can't setup parasite arguments (pid: %d)\n", ctl->pid);
goto err_restore;
}
memcpy(ctl->addr_args, args, args_size);
jerr(ptrace(PTRACE_CONT, (long)ctl->pid, NULL, NULL), err_restore);
jerr(wait4((long)ctl->pid, &status, __WALL, NULL) != (long)ctl->pid, err_restore);
@@ -240,13 +234,8 @@ retry_signal:
/*
* Check if error happened during dumping.
*/
if (ptrace_peek_area((long)ctl->pid,
(void *)args,
(void *)(ctl->addr_args),
args_size)) {
pr_err("Can't get dumper ret code (pid: %d)\n", ctl->pid);
goto err_restore;
}
memcpy(args, ctl->addr_args, args_size);
if (args->ret) {
pr_panic("Dumping sigactions failed with %li (%li) at %li\n",
args->ret,
@@ -584,8 +573,6 @@ struct parasite_ctl *parasite_infect_seized(pid_t pid, int pid_dir, struct list_
ctl->map_length = round_up(parasite_size, PAGE_SIZE);
ctl->parasite_ip = PARASITE_HEAD_ADDR((unsigned long)ctl->remote_map);
ctl->addr_cmd = PARASITE_CMD_ADDR((unsigned long)ctl->remote_map);
ctl->addr_args = PARASITE_ARGS_ADDR((unsigned long)ctl->remote_map);
snprintf(fname, sizeof(fname), "map_files/%p-%p",
ctl->remote_map, ctl->remote_map + ctl->map_length);
@@ -609,6 +596,9 @@ struct parasite_ctl *parasite_infect_seized(pid_t pid, int pid_dir, struct list_
jerr(ptrace(PTRACE_SETREGS, pid, NULL, &regs_orig), err_munmap_restore);
ctl->addr_cmd = (void *)PARASITE_CMD_ADDR((unsigned long)ctl->local_map);
ctl->addr_args = (void *)PARASITE_ARGS_ADDR((unsigned long)ctl->local_map);
ret = parasite_init(ctl, pid);
if (ret) {
pr_err("%d: Can't create a transport socket\n", pid);