xfnw/plan9fox
1
0
Fork 0
Code Issues Pull requests Projects Releases Wiki Activity

Merge remote-tracking branch 'origin/front' into front

Browse source
This commit is contained in:
xfnw 2022-07-27 16:29:22 -04:00
commit a0ac839193
4 changed files with 62 additions and 77 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

5
sys/man/2/exec
View file

@ -67,6 +67,11 @@ and any initial arguments to that program, for example
ls | mc
.EE
.PP
There may be up to 256 bytes of arguments passed to the interpreter.
These are tokenized into up to 32 arguments by
.IR tokenize (2)
before being passed as the interpreters argument vector.
.PP
When a C program is executed,
it is called as follows:
.IP

7
sys/man/8/auth
View file

@ -62,7 +62,7 @@ changeuser, convkeys, printnetkey, status, enable, disable, authsrv, guard.srv,
.PP
.B auth/box
[
.B -d
.B -s
] [
.B -rc
.I file
@ -298,9 +298,8 @@ the child namespace; the
flag specifies a string of driver
characters to keep. The
.B -s
flag gives a base set of namespace
components, ones expected by rc, then passes
the first argument as a script file to rc.
flag initializes the namespace to what rc expects,
and passes its arguments unmodified to /bin/rc.
.PP
.I As
executes

65
sys/src/9/port/sysproc.c
View file

@ -243,35 +243,19 @@ sysrfork(va_list list)
}
static int
shargs(char *s, int n, char **ap)
shargs(char *s, int n, char **ap, int nap)
{
char *p;
int i;
if(n <= 2 || s[0] != '#' || s[1] != '!')
return -1;
s += 2;
n -= 2; /* skip #! */
for(i=0;; i++){
if(i >= n)
return 0;
if(s[i]=='\n')
break;
}
s[i] = 0;
i = 0;
for(;;) {
while(*s==' ' || *s=='\t')
s++;
if(*s == 0)
break;
ap[i++] = s++;
while(*s && *s!=' ' && *s!='\t')
s++;
if(*s == 0)
break;
*s++ = 0;
}
if((p = memchr(s, '\n', n)) == nil)
return 0;
*p = 0;
i = tokenize(s, ap, nap-1);
ap[i] = nil;
return i;
}
@ -300,12 +284,15 @@ beswav(uvlong v)
uintptr
sysexec(va_list list)
{
struct {
Exec;
uvlong hdr[1];
} ehdr;
char line[sizeof(ehdr)];
char *progarg[sizeof(line)/2+1];
union {
struct {
Exec;
uvlong hdr[1];
} ehdr;
char buf[256];
} u;
char line[256];
char *progarg[32+1];
volatile char *args, *elem, *file0;
char **argv, **argp, **argp0;
char *a, *e, *charp, *file;
@ -353,22 +340,22 @@ sysexec(va_list list)
if(!indir)
kstrdup(&elem, up->genbuf);
n = devtab[tc->type]->read(tc, &ehdr, sizeof(ehdr), 0);
n = devtab[tc->type]->read(tc, u.buf, sizeof(u.buf), 0);
if(n >= sizeof(Exec)) {
magic = beswal(ehdr.magic);
magic = beswal(u.ehdr.magic);
if(magic == AOUT_MAGIC) {
if(magic & HDR_MAGIC) {
if(n < sizeof(ehdr))
if(n < sizeof(u.ehdr))
error(Ebadexec);
entry = beswav(ehdr.hdr[0]);
text = UTZERO+sizeof(ehdr);
entry = beswav(u.ehdr.hdr[0]);
text = UTZERO+sizeof(u.ehdr);
} else {
entry = beswal(ehdr.entry);
entry = beswal(u.ehdr.entry);
text = UTZERO+sizeof(Exec);
}
if(entry < text)
error(Ebadexec);
text += beswal(ehdr.text);
text += beswal(u.ehdr.text);
if(text <= entry || text >= (USTKTOP-USTKSIZE))
error(Ebadexec);
@ -393,8 +380,8 @@ sysexec(va_list list)
/*
* Process #! /bin/sh args ...
*/
memmove(line, &ehdr, n);
n = shargs(line, n, progarg);
memmove(line, u.buf, n);
n = shargs(line, n, progarg, nelem(progarg));
if(n < 1)
error(Ebadexec);
/*
@ -411,8 +398,8 @@ sysexec(va_list list)
t = (text+align) & ~align;
text -= UTZERO;
data = beswal(ehdr.data);
bss = beswal(ehdr.bss);
data = beswal(u.ehdr.data);
bss = beswal(u.ehdr.bss);
align = BY2PG-1;
d = (t + data + align) & ~align;
bssend = t + data + bss;

62
sys/src/cmd/auth/box.c
View file

@ -2,7 +2,11 @@
#include <libc.h>
#include <auth.h>
static int debug;
static int debug;
static char cwd[8192];
static char *parts[256];
static int mflags[nelem(parts)];
static int nparts;
static void
binderr(char *new, char *old, int flag)
@ -32,20 +36,14 @@ binderr(char *new, char *old, int flag)
fprint(2, "bind %s %s %s\n", dash, new, old);
}
if(bind(new, old, flag) < 0)
sysfatal("bind: %r");
sysfatal("bind %s: %r", new);
}
static void
resolvenames(char **names, int nname)
{
int i;
char buf[8192];
int fd;
fd = open(".", OREAD|OCEXEC);
if(fd < 0)
sysfatal("could not open .: %r");
fd2path(fd, buf, sizeof buf);
for(i = 0; i < nname; i++){
if(names[i] == nil)
continue;
@ -55,10 +53,9 @@ resolvenames(char **names, int nname)
case '/':
break;
default:
names[i] = cleanname(smprint("%s/%s", buf, names[i]));
}
names[i] = cleanname(smprint("%s/%s", cwd, names[i]));
}
}
close(fd);
}
static void
@ -103,7 +100,8 @@ sandbox(char **names, int *flags, int nname)
free(d);
binderr(skel, dir, MBEFORE);
}
binderr(names[j], targ, flags[j]);
if(flags[j] != -1)
binderr(names[j], targ, flags[j]);
}
binderr(newroot, "/", MREPL);
}
@ -133,16 +131,11 @@ skelfs(void)
sysfatal("/mnt/d mount setup: %r");
}
static char *parts[256];
static int mflags[nelem(parts)];
static int nparts;
static char *rc[] = { "/bin/rc", nil , nil};
static void
push(char *path, int flag)
{
if(nparts == nelem(parts))
sysfatal("component overflow");
sysfatal("too many bound paths");
parts[nparts] = path;
mflags[nparts++] = flag;
}
@ -150,23 +143,23 @@ push(char *path, int flag)
void
usage(void)
{
fprint(2, "usage %s: [ -d ] [ -r file ] [ -c dir ] [ -e devs ] [ -. path ] cmd args...\n", argv0);
fprint(2, "usage %s: [ -r file ] [ -c dir ] [ -e devs ] cmd args...\n", argv0);
exits("usage");
}
void
main(int argc, char **argv)
{
char devs[1024];
int dfd;
char *path;
char **argp, devs[128];
int i, narg, dfd;
char *a;
int sflag;
nparts = 0;
path = "/";
narg = 0;
memset(devs, 0, sizeof devs);
sflag = 0;
argp = argv;
ARGBEGIN{
case 'D':
debug++;
@ -184,9 +177,6 @@ main(int argc, char **argv)
case 'e':
snprint(devs, sizeof devs, "%s%s", devs, EARGF(usage()));
break;
case '.':
path = EARGF(usage());
break;
case 's':
sflag = 1;
break;
@ -195,18 +185,19 @@ main(int argc, char **argv)
break;
}ARGEND
if(argc == 0)
if(argc == 0 && !sflag)
usage();
if(getwd(cwd, sizeof(cwd)) == nil)
sysfatal("getwd: %r");
push(cwd, -1);
if(sflag){
snprint(devs, sizeof devs, "%s%s", devs, "|d");
push("/srv", MREPL|MCREATE);
push("/env", MREPL|MCREATE);
push("/rc", MREPL);
push("/bin", MREPL);
push(argv[0], MREPL);
rc[1] = argv[0];
argv = rc;
argp[narg++] = "/bin/rc";
} else {
if(access(argv[0], AEXIST) == -1){
if((argv[0] = smprint("/bin/%s", argv[0])) == nil)
@ -216,6 +207,9 @@ main(int argc, char **argv)
}
push(argv[0], MREPL);
}
for(i = 0; i < argc; i++)
argp[narg++] = argv[i];
argp[narg] = nil;
rfork(RFNAMEG|RFFDG);
skelfs();
@ -225,7 +219,7 @@ main(int argc, char **argv)
resolvenames(parts, nparts);
sandbox(parts, mflags, nparts);
if(debug)
fprint(2, "chdev %s\n", devs);
@ -238,8 +232,8 @@ main(int argc, char **argv)
}
close(dfd);
if(chdir(path) < 0)
sysfatal("can not cd to %s", path);
exec(argv[0], argv);
if(chdir(cwd) < 0)
sysfatal("chdir %s: %r", cwd);
exec(argp[0], argp);
sysfatal("exec: %r");
}