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authorMike Moreton <Mike.Moreton@frontier-silicon.com>2015-12-02 09:41:58 +0000
committerRob Landley <rob@landley.net>2015-12-06 14:31:44 -0600
commit83250d1f0a87fd184e5b9a5bba8618c3e8ed2c7a (patch)
treef7a357d1b2518930e6a71009d4dbf5aa0660df17 /toys/posix
parentf49f291939afae44bda438bf2509c7ba20a2a78f (diff)
downloadtoybox-83250d1f0a87fd184e5b9a5bba8618c3e8ed2c7a.tar.gz
Correct setting of guid and uid when extracting from a cpio archive.
Diffstat (limited to 'toys/posix')
-rw-r--r--toys/posix/cpio.c19
1 files changed, 11 insertions, 8 deletions
diff --git a/toys/posix/cpio.c b/toys/posix/cpio.c
index a442f0d1..2eb6002f 100644
--- a/toys/posix/cpio.c
+++ b/toys/posix/cpio.c
@@ -3,6 +3,8 @@
* Written 2013 AD by Isaac Dunham; this code is placed under the
* same license as toybox or as CC0, at your option.
*
+ * Portions Copyright 2015 by Frontier Silicon Ltd.
+ *
* http://refspecs.linuxfoundation.org/LSB_4.1.0/LSB-Core-generic/LSB-Core-generic/cpio.html
* and http://pubs.opengroup.org/onlinepubs/7908799/xcu/cpio.html
*
@@ -12,6 +14,7 @@
* Modern cpio expanded header to 110 bytes (first field 6 bytes, rest are 8).
* In order: magic ino mode uid gid nlink mtime filesize devmajor devminor
* rdevmajor rdevminor namesize check
+ * This is the equiavlent of mode -H newc when using GNU CPIO.
USE_CPIO(NEWTOY(cpio, "mduH:p:|i|t|F:v(verbose)o|[!pio][!pot][!pF]", TOYFLAG_BIN))
@@ -121,8 +124,8 @@ void cpio_main(void)
size = x8u(toybuf+54);
mode = x8u(toybuf+14);
- uid = x8u(toybuf+30);
- gid = x8u(toybuf+38);
+ uid = x8u(toybuf+22);
+ gid = x8u(toybuf+30);
timestamp = x8u(toybuf+46); // unsigned 32 bit, so year 2100 problem
if (toys.optflags & (FLAG_t|FLAG_v)) puts(name);
@@ -142,7 +145,7 @@ void cpio_main(void)
if (!test) err = symlink(data, name);
free(data);
// Can't get a filehandle to a symlink, so do special chown
- if (!err && !getpid()) err = lchown(name, uid, gid);
+ if (!err && !geteuid()) err = lchown(name, uid, gid);
} else if (S_ISREG(mode)) {
int fd = test ? 0 : open(name, O_CREAT|O_WRONLY|O_TRUNC|O_NOFOLLOW, mode);
@@ -167,14 +170,14 @@ void cpio_main(void)
if (!test) {
// set owner, restore dropped suid bit
- if (!getpid()) {
+ if (!geteuid()) {
err = fchown(fd, uid, gid);
if (!err) err = fchmod(fd, mode);
}
close(fd);
}
} else if (!test)
- err = mknod(name, mode, makedev(x8u(toybuf+62), x8u(toybuf+70)));
+ err = mknod(name, mode, makedev(x8u(toybuf+78), x8u(toybuf+86)));
// Set ownership and timestamp.
if (!test && !err) {
@@ -182,11 +185,11 @@ void cpio_main(void)
// by name to chown/utime, but how do we know it's the same item?
// Check that we at least have the right type of entity open, and do
// NOT restore dropped suid bit in this case.
- if (!S_ISREG(mode) && !S_ISLNK(mode) && !getpid()) {
- int fd = open(name, O_WRONLY|O_NOFOLLOW);
+ if (!S_ISREG(mode) && !S_ISLNK(mode) && !geteuid()) {
+ int fd = open(name, O_RDONLY|O_NOFOLLOW);
struct stat st;
- if (fd != -1 && !fstat(fd, &st) && (st.st_mode&S_IFMT) == mode)
+ if (fd != -1 && !fstat(fd, &st) && (st.st_mode&S_IFMT) == (mode&S_IFMT))
err = fchown(fd, uid, gid);
else err = 1;