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Merge "crash_reporter: Use the actual GID of the crashing process"

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Steve Fung 2015-10-10 05:33:49 +00:00 committed by Gerrit Code Review
commit 4b2d6dd346
4 changed files with 24 additions and 33 deletions
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2
crash_reporter/crash_reporter.rc
View file

@ -1,6 +1,6 @@
on property:crash_reporter.coredump.enabled=1
write /proc/sys/kernel/core_pattern \
"|/system/bin/crash_reporter --user=%P:%s:%u:%e"
"|/system/bin/crash_reporter --user=%P:%s:%u:%g:%e"
on property:crash_reporter.coredump.enabled=0
write /proc/sys/kernel/core_pattern "core"

33
crash_reporter/user_collector.cc
View file

@ -51,8 +51,9 @@ static const char kStatePrefix[] = "State:\t";
static const char kCoreTempFolder[] = "/data/misc/crash_reporter/tmp";
// Define an otherwise invalid value that represents an unknown UID.
// Define an otherwise invalid value that represents an unknown UID and GID.
static const uid_t kUnknownUid = -1;
static const gid_t kUnknownGid = -1;
const char *UserCollector::kUserId = "Uid:\t";
const char *UserCollector::kGroupId = "Gid:\t";
@ -117,22 +118,6 @@ std::string UserCollector::GetErrorTypeSignature(ErrorType error_type) const {
}
}
// Return the string that should be used for the kernel's core_pattern file.
// Note that if you change the format of the enabled pattern, you'll probably
// also need to change the ParseCrashAttributes() function below, the
// user_collector_test.cc unittest, and the logging_UserCrash.py autotest.
std::string UserCollector::GetPattern(bool enabled) const {
if (enabled) {
// Combine the four crash attributes into one parameter to try to reduce
// the size of the invocation line for crash_reporter, since the kernel
// has a fixed-sized (128B) buffer for it (before parameter expansion).
// Note that the kernel does not support quoted arguments in core_pattern.
return StringPrintf("|%s --user=%%P:%%s:%%u:%%e", our_path_.c_str());
} else {
return "core";
}
}
bool UserCollector::SetUpInternal(bool enabled) {
CHECK(initialized_);
LOG(INFO) << (enabled ? "Enabling" : "Disabling") << " user crash handling";
@ -554,15 +539,18 @@ UserCollector::ErrorType UserCollector::ConvertAndEnqueueCrash(
bool UserCollector::ParseCrashAttributes(const std::string &crash_attributes,
pid_t *pid, int *signal, uid_t *uid,
gid_t *gid,
std::string *kernel_supplied_name) {
pcrecpp::RE re("(\\d+):(\\d+):(\\d+):(.*)");
if (re.FullMatch(crash_attributes, pid, signal, uid, kernel_supplied_name))
pcrecpp::RE re("(\\d+):(\\d+):(\\d+):(\\d+):(.*)");
if (re.FullMatch(crash_attributes, pid, signal, uid, gid,
kernel_supplied_name))
return true;
LOG(INFO) << "Falling back to parsing crash attributes '"
<< crash_attributes << "' without UID";
<< crash_attributes << "' without UID and GID";
pcrecpp::RE re_without_uid("(\\d+):(\\d+):(.*)");
*uid = kUnknownUid;
*gid = kUnknownGid;
return re_without_uid.FullMatch(crash_attributes, pid, signal,
kernel_supplied_name);
}
@ -595,10 +583,11 @@ bool UserCollector::HandleCrash(const std::string &crash_attributes,
pid_t pid = 0;
int signal = 0;
uid_t supplied_ruid = kUnknownUid;
gid_t supplied_rgid = kUnknownGid;
std::string kernel_supplied_name;
if (!ParseCrashAttributes(crash_attributes, &pid, &signal, &supplied_ruid,
&kernel_supplied_name)) {
&supplied_rgid, &kernel_supplied_name)) {
LOG(ERROR) << "Invalid parameter: --user=" << crash_attributes;
return false;
}
@ -606,7 +595,7 @@ bool UserCollector::HandleCrash(const std::string &crash_attributes,
// Switch to the group and user that ran the crashing binary in order to
// access their /proc files. Do not set suid/sgid, so that we can switch
// back after copying the necessary files.
if (setresgid(supplied_ruid, supplied_ruid, -1) != 0) {
if (setresgid(supplied_rgid, supplied_rgid, -1) != 0) {
PLOG(FATAL) << "Unable to set real group ID to access process files";
}
if (setresuid(supplied_ruid, supplied_ruid, -1) != 0) {

3
crash_reporter/user_collector.h
View file

@ -105,7 +105,6 @@ class UserCollector : public CrashCollector {
// crash_reporter-user-collection signature.
std::string GetErrorTypeSignature(ErrorType error_type) const;
std::string GetPattern(bool enabled) const;
bool SetUpInternal(bool enabled);
// Returns, via |line|, the first line in |lines| that starts with |prefix|.
@ -166,7 +165,7 @@ class UserCollector : public CrashCollector {
ErrorType ConvertAndEnqueueCrash(pid_t pid, const std::string &exec_name,
uid_t supplied_ruid, bool *out_of_capacity);
bool ParseCrashAttributes(const std::string &crash_attributes,
pid_t *pid, int *signal, uid_t *uid,
pid_t *pid, int *signal, uid_t *uid, gid_t *gid,
std::string *kernel_supplied_name);
bool ShouldDump(bool has_owner_consent,

19
crash_reporter/user_collector_test.cc
View file

@ -98,35 +98,38 @@ TEST_F(UserCollectorTest, ParseCrashAttributes) {
pid_t pid;
int signal;
uid_t uid;
gid_t gid;
std::string exec_name;
EXPECT_TRUE(collector_.ParseCrashAttributes("123456:11:1000:foobar",
&pid, &signal, &uid, &exec_name));
EXPECT_TRUE(collector_.ParseCrashAttributes("123456:11:1000:2000:foobar",
&pid, &signal, &uid, &gid, &exec_name));
EXPECT_EQ(123456, pid);
EXPECT_EQ(11, signal);
EXPECT_EQ(1000, uid);
EXPECT_EQ(2000, gid);
EXPECT_EQ("foobar", exec_name);
EXPECT_TRUE(collector_.ParseCrashAttributes("4321:6:barfoo",
&pid, &signal, &uid, &exec_name));
&pid, &signal, &uid, &gid, &exec_name));
EXPECT_EQ(4321, pid);
EXPECT_EQ(6, signal);
EXPECT_EQ(-1, uid);
EXPECT_EQ(-1, gid);
EXPECT_EQ("barfoo", exec_name);
EXPECT_FALSE(collector_.ParseCrashAttributes("123456:11",
&pid, &signal, &uid, &exec_name));
&pid, &signal, &uid, &gid, &exec_name));
EXPECT_TRUE(collector_.ParseCrashAttributes("123456:11:exec:extra",
&pid, &signal, &uid, &exec_name));
&pid, &signal, &uid, &gid, &exec_name));
EXPECT_EQ("exec:extra", exec_name);
EXPECT_FALSE(collector_.ParseCrashAttributes("12345p:11:foobar",
&pid, &signal, &uid, &exec_name));
&pid, &signal, &uid, &gid, &exec_name));
EXPECT_FALSE(collector_.ParseCrashAttributes("123456:1 :foobar",
&pid, &signal, &uid, &exec_name));
&pid, &signal, &uid, &gid, &exec_name));
EXPECT_FALSE(collector_.ParseCrashAttributes("123456::foobar",
&pid, &signal, &uid, &exec_name));
&pid, &signal, &uid, &gid, &exec_name));
}
TEST_F(UserCollectorTest, ShouldDumpDeveloperImageOverridesConsent) {