Revert "logd: validate and fill in socket credentials"
We don't want to fake socket credentials if they were not provided by
the kernel. If there is a bug preventing us from reading the
credentials then it must be solved directly.
Test: logd, liblog unit tests
Test: boot and ensure overflow uid doesn't show up
This reverts commit c4e4823b00a94627e922eada1172688818471b0c.
Change-Id: I683129a8a214637635f163ae25c39bb8a47cd50f
diff --git a/logd/LogBuffer.h b/logd/LogBuffer.h
index 774d4ab..404433f 100644
--- a/logd/LogBuffer.h
+++ b/logd/LogBuffer.h
@@ -159,12 +159,7 @@
const char* pidToName(pid_t pid) {
return stats.pidToName(pid);
}
- virtual uid_t pidToUid(pid_t pid) override {
- return stats.pidToUid(pid);
- }
- virtual pid_t tidToPid(pid_t tid) override {
- return stats.tidToPid(tid);
- }
+ uid_t pidToUid(pid_t pid) { return stats.pidToUid(pid); }
const char* uidToName(uid_t uid) {
return stats.uidToName(uid);
}
diff --git a/logd/LogBufferInterface.cpp b/logd/LogBufferInterface.cpp
index 4b6d363..66b3ab4 100644
--- a/logd/LogBufferInterface.cpp
+++ b/logd/LogBufferInterface.cpp
@@ -15,15 +15,7 @@
*/
#include "LogBufferInterface.h"
-#include "LogUtils.h"
LogBufferInterface::LogBufferInterface() {
}
-LogBufferInterface::~LogBufferInterface() {
-}
-uid_t LogBufferInterface::pidToUid(pid_t pid) {
- return android::pidToUid(pid);
-}
-pid_t LogBufferInterface::tidToPid(pid_t tid) {
- return android::tidToPid(tid);
-}
+LogBufferInterface::~LogBufferInterface() {}
\ No newline at end of file
diff --git a/logd/LogBufferInterface.h b/logd/LogBufferInterface.h
index f31e244..2bb08f9 100644
--- a/logd/LogBufferInterface.h
+++ b/logd/LogBufferInterface.h
@@ -33,9 +33,6 @@
virtual int log(log_id_t log_id, log_time realtime, uid_t uid, pid_t pid,
pid_t tid, const char* msg, uint16_t len) = 0;
- virtual uid_t pidToUid(pid_t pid);
- virtual pid_t tidToPid(pid_t tid);
-
private:
DISALLOW_COPY_AND_ASSIGN(LogBufferInterface);
};
diff --git a/logd/LogListener.cpp b/logd/LogListener.cpp
index 2f22778..7f78e19 100644
--- a/logd/LogListener.cpp
+++ b/logd/LogListener.cpp
@@ -14,9 +14,7 @@
* limitations under the License.
*/
-#include <ctype.h>
#include <limits.h>
-#include <stdio.h>
#include <sys/cdefs.h>
#include <sys/prctl.h>
#include <sys/socket.h>
@@ -78,11 +76,8 @@
cmsg = CMSG_NXTHDR(&hdr, cmsg);
}
- struct ucred fake_cred;
if (cred == nullptr) {
- cred = &fake_cred;
- cred->pid = 0;
- cred->uid = DEFAULT_OVERFLOWUID;
+ return false;
}
if (cred->uid == AID_LOGD) {
@@ -106,27 +101,6 @@
return false;
}
- // Check credential validity, acquire corrected details if not supplied.
- if (cred->pid == 0) {
- cred->pid = logbuf ? logbuf->tidToPid(header->tid)
- : android::tidToPid(header->tid);
- if (cred->pid == getpid()) {
- // We expect that /proc/<tid>/ is accessible to self even without
- // readproc group, so that we will always drop messages that come
- // from any of our logd threads and their library calls.
- return false; // ignore self
- }
- }
- if (cred->uid == DEFAULT_OVERFLOWUID) {
- uid_t uid =
- logbuf ? logbuf->pidToUid(cred->pid) : android::pidToUid(cred->pid);
- if (uid == AID_LOGD) {
- uid = logbuf ? logbuf->pidToUid(header->tid)
- : android::pidToUid(cred->pid);
- }
- if (uid != AID_LOGD) cred->uid = uid;
- }
-
char* msg = ((char*)buffer) + sizeof(android_log_header_t);
n -= sizeof(android_log_header_t);
diff --git a/logd/LogListener.h b/logd/LogListener.h
index a562a54..e16c5fb 100644
--- a/logd/LogListener.h
+++ b/logd/LogListener.h
@@ -20,16 +20,6 @@
#include <sysutils/SocketListener.h>
#include "LogReader.h"
-// DEFAULT_OVERFLOWUID is defined in linux/highuid.h, which is not part of
-// the uapi headers for userspace to use. This value is filled in on the
-// out-of-band socket credentials if the OS fails to find one available.
-// One of the causes of this is if SO_PASSCRED is set, all the packets before
-// that point will have this value. We also use it in a fake credential if
-// no socket credentials are supplied.
-#ifndef DEFAULT_OVERFLOWUID
-#define DEFAULT_OVERFLOWUID 65534
-#endif
-
class LogListener : public SocketListener {
LogBufferInterface* logbuf;
LogReader* reader;
diff --git a/logd/LogStatistics.cpp b/logd/LogStatistics.cpp
index 116e08e..431b778 100644
--- a/logd/LogStatistics.cpp
+++ b/logd/LogStatistics.cpp
@@ -837,35 +837,12 @@
}
return AID_LOGD; // associate this with the logger
}
-
-pid_t tidToPid(pid_t tid) {
- char buffer[512];
- snprintf(buffer, sizeof(buffer), "/proc/%u/status", tid);
- FILE* fp = fopen(buffer, "r");
- if (fp) {
- while (fgets(buffer, sizeof(buffer), fp)) {
- int pid = tid;
- char space = 0;
- if ((sscanf(buffer, "Tgid: %d%c", &pid, &space) == 2) &&
- isspace(space)) {
- fclose(fp);
- return pid;
- }
- }
- fclose(fp);
- }
- return tid;
-}
}
uid_t LogStatistics::pidToUid(pid_t pid) {
return pidTable.add(pid)->second.getUid();
}
-pid_t LogStatistics::tidToPid(pid_t tid) {
- return tidTable.add(tid)->second.getPid();
-}
-
// caller must free character string
const char* LogStatistics::pidToName(pid_t pid) const {
// An inconvenient truth ... getName() can alter the object
diff --git a/logd/LogStatistics.h b/logd/LogStatistics.h
index 469f6dc..0782de3 100644
--- a/logd/LogStatistics.h
+++ b/logd/LogStatistics.h
@@ -306,6 +306,10 @@
std::string format(const LogStatistics& stat, log_id_t id) const;
};
+namespace android {
+uid_t pidToUid(pid_t pid);
+}
+
struct PidEntry : public EntryBaseDropped {
const pid_t pid;
uid_t uid;
@@ -385,13 +389,6 @@
uid(android::pidToUid(tid)),
name(android::tidToName(tid)) {
}
- TidEntry(pid_t tid)
- : EntryBaseDropped(),
- tid(tid),
- pid(android::tidToPid(tid)),
- uid(android::pidToUid(tid)),
- name(android::tidToName(tid)) {
- }
explicit TidEntry(const LogBufferElement* element)
: EntryBaseDropped(element),
tid(element->getTid()),
@@ -787,7 +784,6 @@
// helper (must be locked directly or implicitly by mLogElementsLock)
const char* pidToName(pid_t pid) const;
uid_t pidToUid(pid_t pid);
- pid_t tidToPid(pid_t tid);
const char* uidToName(uid_t uid) const;
};
diff --git a/logd/LogUtils.h b/logd/LogUtils.h
index 4dcd3e7..fa9f398 100644
--- a/logd/LogUtils.h
+++ b/logd/LogUtils.h
@@ -38,8 +38,6 @@
// Caller must own and free returned value
char* pidToName(pid_t pid);
char* tidToName(pid_t tid);
-uid_t pidToUid(pid_t pid);
-pid_t tidToPid(pid_t tid);
// Furnished in LogTags.cpp. Thread safe.
const char* tagToName(uint32_t tag);
