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signals: dump alternate stack as misc parameters

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The initilization stage is not good for that, because it can fail.

Signed-off-by: Andrey Vagin <avagin@openvz.org>
Signed-off-by: Pavel Emelyanov <xemul@parallels.com>
This commit is contained in:
Andrey Vagin
2013-07-11 13:46:48 +04:00
committed by Pavel Emelyanov
parent 27582e3272
commit c2c44d5261
4 changed files with 16 additions and 15 deletions
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3
cr-dump.c
View File

@@ -668,6 +668,9 @@ static int dump_task_core_all(struct parasite_ctl *ctl,
core_put_tls(core, misc->tls);
CORE_THREAD_ARCH_INFO(core)->clear_tid_addr = encode_pointer(misc->tid_addr);
BUG_ON(!core->thread_core->sas);
copy_sas(core->thread_core->sas, &misc->sas);
ret = pb_write_one(fd_core, core, PB_CORE);
if (ret < 0)
goto err;

10
include/parasite.h
View File

@@ -71,7 +71,6 @@ struct parasite_init_args {
k_rtsigset_t sig_blocked;
struct rt_sigframe *sigframe;
stack_t sas;
};
struct parasite_log_args {
@@ -150,6 +149,8 @@ struct parasite_dump_misc {
u32 pgid;
u32 tls;
u32 umask;
stack_t sas;
};
#define PARASITE_MAX_GROUPS (PAGE_SIZE / sizeof(unsigned int) - 2 * sizeof(unsigned))
@@ -168,6 +169,13 @@ struct parasite_dump_thread {
stack_t sas;
};
static inline void copy_sas(ThreadSasEntry *dst, const stack_t *src)
{
dst->ss_sp = encode_pointer(src->ss_sp);
dst->ss_size = (u64)src->ss_size;
dst->ss_flags = src->ss_flags;
}
#define PARASITE_MAX_FDS (PAGE_SIZE / sizeof(int))
struct parasite_drain_fd {

10
parasite-syscall.c
View File

@@ -370,13 +370,6 @@ static int parasite_set_logfd(struct parasite_ctl *ctl, pid_t pid)
return 0;
}
static void copy_sas(ThreadSasEntry *dst, stack_t *src)
{
dst->ss_sp = encode_pointer(src->ss_sp);
dst->ss_size = (u64)src->ss_size;
dst->ss_flags = src->ss_flags;
}
static int parasite_init(struct parasite_ctl *ctl, pid_t pid, struct pstree_item *item)
{
static int ssock = -1;
@@ -428,9 +421,6 @@ static int parasite_init(struct parasite_ctl *ctl, pid_t pid, struct pstree_item
ctl->sig_blocked = args->sig_blocked;
ctl->use_sig_blocked = true;
BUG_ON(!item->core[0]->thread_core->sas);
copy_sas(item->core[0]->thread_core->sas, &args->sas);
sock = accept(ssock, NULL, 0);
if (sock < 0) {
pr_perror("Can't accept connection to the transport socket");

8
pie/parasite.c
View File

@@ -149,6 +149,10 @@ static int dump_misc(struct parasite_dump_misc *args)
args->umask = sys_umask(0);
sys_umask(args->umask); /* never fails */
ret = sys_sigaltstack(NULL, &args->sas);
if (ret)
return ret;
ret = sys_prctl(PR_GET_TID_ADDRESS, (unsigned long) &args->tid_addr, 0, 0, 0);
return ret;
@@ -250,10 +254,6 @@ static int init(struct parasite_init_args *args)
if (ret)
return -1;
ret = sys_sigaltstack(NULL, &args->sas);
if (ret)
goto err;
tsock = sys_socket(PF_UNIX, SOCK_STREAM, 0);
if (tsock < 0) {
ret = tsock;