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imgact_binmisc: minor re-organization of imgact_binmisc_exec exits

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Notably, streamline error paths through the existing 'done' label, making it
easier to quickly verify correct cleanup.

Future work might add a kernel-only flag to indicate that a interpreter uses
#a. Currently, all executions via imgact_binmisc pay the penalty of
constructing sname/fname, even if they will not use it. qemu-user-static
doesn't need it, the stock rc script for qemu-user-static certainly doesn't
use it, and I suspect these are the vast majority of (if not the only)
current users.

MFC after:	1 week
This commit is contained in:
kevans 2020-11-07 03:28:32 +00:00
parent fc12f29af6
commit b518a50dd1
1 changed files with 6 additions and 8 deletions
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14
sys/kern/imgact_binmisc.c
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@ -580,24 +580,24 @@ imgact_binmisc_exec(struct image_params *imgp)
struct sbuf *sname;
char *s, *d;
sname = NULL;
/* Do we have an interpreter for the given image header? */
sx_slock(&interp_list_sx);
if ((ibe = imgact_binmisc_find_interpreter(image_header)) == NULL) {
sx_sunlock(&interp_list_sx);
return (-1);
error = -1;
goto done;
}
/* No interpreter nesting allowed. */
if (imgp->interpreted & IMGACT_BINMISC) {
sx_sunlock(&interp_list_sx);
return (ENOEXEC);
error = ENOEXEC;
goto done;
}
imgp->interpreted |= IMGACT_BINMISC;
if (imgp->args->fname != NULL) {
fname = imgp->args->fname;
sname = NULL;
} else {
/* Use the fdescfs(5) path for fexecve(2). */
sname = sbuf_new_auto();
@ -636,7 +636,6 @@ imgact_binmisc_exec(struct image_params *imgp)
default:
/* Hmm... This shouldn't happen. */
sx_sunlock(&interp_list_sx);
printf("%s: Unknown macro #%c sequence in "
"interpreter string\n", KMOD_NAME, *(s + 1));
error = EINVAL;
@ -648,7 +647,6 @@ imgact_binmisc_exec(struct image_params *imgp)
/* Make room for the interpreter */
error = exec_args_adjust_args(imgp->args, 0, offset);
if (error != 0) {
sx_sunlock(&interp_list_sx);
goto done;
}
@ -698,11 +696,11 @@ imgact_binmisc_exec(struct image_params *imgp)
s++;
}
*d = '\0';
sx_sunlock(&interp_list_sx);
imgp->interpreter_name = imgp->args->begin_argv;
done:
sx_sunlock(&interp_list_sx);
if (sname)
sbuf_delete(sname);
return (error);