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mm: introduce coredump parameter structure

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Introduce coredump parameter data structure (struct coredump_params) to
simplify binfmt->core_dump() arguments.

Signed-off-by: Masami Hiramatsu <mhiramat@redhat.com>
Suggested-by: Ingo Molnar <mingo@elte.hu>
Cc: Hidehiro Kawai <hidehiro.kawai.ez@hitachi.com>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Roland McGrath <roland@redhat.com>
Cc: KOSAKI Motohiro <kosaki.motohiro@jp.fujitsu.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Masami Hiramatsu
2009-12-17 15:27:16 -08:00
committed by Linus Torvalds
parent 9cd80bbb07
commit f6151dfea2
7 changed files with 69 additions and 53 deletions
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fs/exec.c
+21 -17
View File
@@ -1763,17 +1763,20 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
struct mm_struct *mm = current->mm;
struct linux_binfmt * binfmt;
struct inode * inode;
struct file * file;
const struct cred *old_cred;
struct cred *cred;
int retval = 0;
int flag = 0;
int ispipe = 0;
unsigned long core_limit = current->signal->rlim[RLIMIT_CORE].rlim_cur;
char **helper_argv = NULL;
int helper_argc = 0;
int dump_count = 0;
static atomic_t core_dump_count = ATOMIC_INIT(0);
struct coredump_params cprm = {
.signr = signr,
.regs = regs,
.limit = current->signal->rlim[RLIMIT_CORE].rlim_cur,
};
audit_core_dumps(signr);
@@ -1829,15 +1832,15 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
ispipe = format_corename(corename, signr);
unlock_kernel();
if ((!ispipe) && (core_limit < binfmt->min_coredump))
if ((!ispipe) && (cprm.limit < binfmt->min_coredump))
goto fail_unlock;
if (ispipe) {
if (core_limit == 0) {
if (cprm.limit == 0) {
/*
* Normally core limits are irrelevant to pipes, since
* we're not writing to the file system, but we use
* core_limit of 0 here as a speacial value. Any
* cprm.limit of 0 here as a speacial value. Any
* non-zero limit gets set to RLIM_INFINITY below, but
* a limit of 0 skips the dump. This is a consistent
* way to catch recursive crashes. We can still crash
@@ -1870,25 +1873,25 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
goto fail_dropcount;
}
core_limit = RLIM_INFINITY;
cprm.limit = RLIM_INFINITY;
/* SIGPIPE can happen, but it's just never processed */
if (call_usermodehelper_pipe(helper_argv[0], helper_argv, NULL,
&file)) {
&cprm.file)) {
printk(KERN_INFO "Core dump to %s pipe failed\n",
corename);
goto fail_dropcount;
}
} else
file = filp_open(corename,
cprm.file = filp_open(corename,
O_CREAT | 2 | O_NOFOLLOW | O_LARGEFILE | flag,
0600);
if (IS_ERR(file))
if (IS_ERR(cprm.file))
goto fail_dropcount;
inode = file->f_path.dentry->d_inode;
inode = cprm.file->f_path.dentry->d_inode;
if (inode->i_nlink > 1)
goto close_fail; /* multiple links - don't dump */
if (!ispipe && d_unhashed(file->f_path.dentry))
if (!ispipe && d_unhashed(cprm.file->f_path.dentry))
goto close_fail;
/* AK: actually i see no reason to not allow this for named pipes etc.,
@@ -1901,21 +1904,22 @@ void do_coredump(long signr, int exit_code, struct pt_regs *regs)
*/
if (inode->i_uid != current_fsuid())
goto close_fail;
if (!file->f_op)
if (!cprm.file->f_op)
goto close_fail;
if (!file->f_op->write)
if (!cprm.file->f_op->write)
goto close_fail;
if (!ispipe && do_truncate(file->f_path.dentry, 0, 0, file) != 0)
if (!ispipe &&
do_truncate(cprm.file->f_path.dentry, 0, 0, cprm.file) != 0)
goto close_fail;
retval = binfmt->core_dump(signr, regs, file, core_limit);
retval = binfmt->core_dump(&cprm);
if (retval)
current->signal->group_exit_code |= 0x80;
close_fail:
if (ispipe && core_pipe_limit)
wait_for_dump_helpers(file);
filp_close(file, NULL);
wait_for_dump_helpers(cprm.file);
filp_close(cprm.file, NULL);
fail_dropcount:
if (dump_count)
atomic_dec(&core_dump_count);