42a9349dc4 modified init's
builtin chmod, chown, and mkdir calls to avoid following
symlinks. This addressed a number of attacks we were seeing
at the time where poorly written init scripts were following
attacker supplied symlinks resulting in rooting vulnerabilities.
To avoid race conditions, the previous implementation only ran
fchown / fchmod on file descriptors opened with open(O_NOFOLLOW).
Unfortunately, unlike the normal "chown" or "chmod" calls, this
requires read or write access to the underlying file. This
isn't ideal, as opening some files may have side effects, or
init may not have permission to open certain files (such as when
SELinux is enabled).
Instead of using open(O_NOFOLLOW) + fchown(), use lchown() instead.
As before, the target of the symlink won't be modified by chown.
This also supports setting the ownership of symlinks.
Instead of using open(O_NOFOLLOW) + fchmod(), use
fchmodat(AT_SYMLINK_NOFOLLOW) instead. As before, the target of the
symlink won't be modified by chmod.
This change will continue to ensure that chown/chmod/mkdir doesn't
follow symlinks, without requiring init to open every file in
read-only or read-write mode.
This change depends on bionic commit I1eba0cdb2c509d9193ceecf28f13118188a3cfa7
Addresses the following mako/occam SELinux denial:
audit(1422770408.951:6): avc: denied { write } for pid=1 comm="init" name="smd7" dev="tmpfs" ino=7207 scontext=u:r:init:s0 tcontext=u:object_r:radio_device:s0 tclass=chr_file
Change-Id: I14fde956784d65c44e7aa91dd7eea9a004df3081
/data/tombstones is referenced by core platform code, but is not
guaranteed to exist on all Android devices. Move the directory
creation out of device specific files and into the core
init.rc file.
Bug: https://code.google.com/p/android/issues/detail?id=93207
Change-Id: I94ae5199a6a32c4fe555ca994fc4a8345e0c9690
Delay mounting encryptable but unencrypted volumes until we can
check the ro.vold.forceencrypt flag, then optionally encrypt.
Requires matching vold change from
https://googleplex-android-review.git.corp.google.com/#/c/615309/
Bug: 18764230
Change-Id: If22008be8de6a4f3216b349f81ace49be1730314
This allows a vendor to force encryption on devices via a vendor
partition flag:
ro.vold.forceencryption 1
Bug: 18764230
Change-Id: Id0049ce64e34e4f6f96e593aadd70c277ac131c8
If tracing was not enabled (the ADB_TRACE environment variable was not
set specially), writex() and readx() would still call dump_hex() which
would construct hex tracing strings, which would be immediately
discarded and not printed (because tracing is not enabled).
The fix is to only call dump_hex() if ADB_TRACING evalutes to true, the
same way that dump_packet() is only called if ADB_TRACING evaluates to
true.
Change-Id: I1651680da344389475ebdeea77ba1982960d5764
Signed-off-by: Spencer Low <CompareAndSwap@gmail.com>
Currently, a host running adb will sign a token of any length passed
to it by a device, effectively acting as a signing oracle. If the
ADB_VENDOR_KEYS environment variable is used to specify an additional
key to use, this behavior is not only unexpected, but probably also
unwanted. Further discussion can be found from this thread:
http://www.metzdowd.com/pipermail/cryptography/2015-January/024423.html
This change adds a check to ensure token length matches TOKEN_SIZE
before it's signed, which prevents an attacker from signing longer
messages.
Change-Id: I7b2cc1f051941bf9b66e1c02980850bede501793
On Windows, adb_socket_setbufsize() was taking a file descriptor value
from the compatibility layer in sysdeps_win32.c (namely, an index into
the _win32_fhs array) and passing it to the Winsock setsockopt() call,
which wants a Winsock SOCKET handle. Basically, adb_socket_setbufsize()
was passing `fd` instead of `_fh_from_int(fd)->fh_socket`, resulting in
adb effectively setting a socket buffer size on a random socket in the
process.
The fix is to introduce adb_setsockopt() which just calls setsockopt()
on non-Win32, and which uses the Winsock SOCKET handle on Win32. The
change also moves Win32 disable_tcp_nagle() to a header and adds an
extra sanity check to adb_shutdown().
Change-Id: I4354e818d27538f7ff5b0e70b28bdb6300e1b98b
Signed-off-by: Spencer Low <CompareAndSwap@gmail.com>
Using a const bool rather than an ifdef means the compiler can still
protect us from breaking code paths that aren't included in every
build variant.
Change-Id: Ic45c8fb52cd66c3ce090d760cdb92104e31265f5
Hadn't caught this in the previous submission because I tested the
build with another change on top of it that also fixes this.
Bug: 17626262
Change-Id: Ia40127618a5466e382081760d614ff7fc09d50a3
Much of adb is duplicated in bootable/recovery/minadb and fastboot.
Changes made to adb rarely get ported to the other two, so the trees
have diverged a bit. We'd like to stop this because it is a
maintenance nightmare, but the divergence makes this difficult to do
all at once. For now, we will start small by moving common files into
a static library. Hopefully some day we can get enough of adb in here
that we no longer need minadb.
Bug: 17626262
Change-Id: Ic8d5653bfcc0fec4e1acbece124402355084b864
The kernel finally has the pt_regs structure properly defined for mips,
so we don't need to define it ourselves.
Change-Id: Ifdf75ed827cd2390962e9b3a182bdbbf02fe0732
There was a misinterpretation of how the v2 header works. The flags
in the header indicate what is in the rest of the structure.
Bug: 19127803
Change-Id: I5fa0dae6da51522c9afc4c94838eb6f462208683
If you run `adb tcpip`, adbd tries to process a string of 'tcpip:' using
this code:
} else if(!strncmp(name, "tcpip:", 6)) {
int port;
if (sscanf(name + 6, "%d", &port) == 0) {
port = 0;
}
ret = create_service_thread(restart_tcp_service, (void *) (uintptr_t) port);
If a zero-length string is passed to sscanf(), it returns EOF (-1) which
causes the if statement to skip the block, leaving the port variable
uninitialized.
I found this by running `adb tcpip` and sometimes getting 'invalid port'
and sometimes a device would start listening on a random port number.
The fix is to check the sscanf() return value for the success case (the
number of items successfully parsed), as is already done in other parts
of the adb code. I also fixed-up another instance of the same
code-pattern in services.c.
Change-Id: I8c9c33485ad076828da0ac74f048fdad561669d3
Signed-off-by: Spencer Low <CompareAndSwap@gmail.com>
logd suffers major performance degradation when persistent (blocking)
client reader connects to it (e.g. logcat). The root cause of the
degradation is that each time when reader is notified of the arrival
of new log entries, the reader commences its search for the new entries
from the beginning of the linked list (oldest entries first).
This commit alters the search to start from the end of the linked list
and work backwards. This dramatically decreases logd CPU consumption
when blocking reader is connected, and increases the maximum logging
throughput (before the logs start getting lost) by a factor ~ 20.
Change-Id: Ib60955ce05544e52a8b24acc3dcf5863e1e39c5c
