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new helper: replace_fd()

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analog of dup2(), except that it takes struct file * as source.

Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
Al Viro 2012-08-21 12:11:46 -04:00
commit 8280d16172
3 changed files with 64 additions and 39 deletions
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11
fs/exec.c
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@ -2041,23 +2041,14 @@ static void wait_for_dump_helpers(struct file *file)
static int umh_pipe_setup(struct subprocess_info *info, struct cred *new)
{
struct file *files[2];
struct fdtable *fdt;
struct coredump_params *cp = (struct coredump_params *)info->data;
struct files_struct *cf = current->files;
int err = create_pipe_files(files, 0);
if (err)
return err;
cp->file = files[1];
sys_close(0);
fd_install(0, files[0]);
spin_lock(&cf->file_lock);
fdt = files_fdtable(cf);
__set_open_fd(0, fdt);
__clear_close_on_exec(0, fdt);
spin_unlock(&cf->file_lock);
replace_fd(0, files[0], 0);
/* and disallow core files too */
current->signal->rlim[RLIMIT_CORE] = (struct rlimit){1, 1};