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Add a helpful error message if GetUnreachableMemory fails 

The primary reason for GetUnreachableMemory failing is selinux
blocking system apps from ptracing themselves.  Add a helpful
error message suggesting setenforce 0.

Bug: 27945735
Test: dumpsys meminfo --unreachable com.android.systemui
Change-Id: Ibfa9507860be36dffd514f82027f7a2f8a72ac48
This commit is contained in:
Colin Cross 2017-06-13 16:41:58 -07:00
parent 6cc5927e0d
commit 72d3881412
1 changed files with 4 additions and 1 deletions
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5
libmemunreachable/MemUnreachable.cpp
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@ -502,7 +502,10 @@ std::string UnreachableMemoryInfo::ToString(bool log_contents) const {
std::string GetUnreachableMemoryString(bool log_contents, size_t limit) {
UnreachableMemoryInfo info;
if (!GetUnreachableMemory(info, limit)) {
return "Failed to get unreachable memory\n";
return "Failed to get unreachable memory\n"
"If you are trying to get unreachable memory from a system app\n"
"(like com.android.systemui), disable selinux first using\n"
"setenforce 0\n";
}
return info.ToString(log_contents);