From 862562ce0db2b459a37460d3f263bfed7b9643b1 Mon Sep 17 00:00:00 2001
From: Matthias Maennich <matthias@maennich.net>
Date: Thu, 5 Oct 2017 13:45:48 +0200
Subject: [PATCH] SystemInformation: fix potential off-by-one write
in case readlink uses the complete buffer (1024) it will truncate the
result and return 1024 assigned to ll. the subsequent buf[ll] will then be
out of bounds.
the fix assumes, that a truncated result is as useful as experiencing an
error during readlink, hence falling back to /proc/self/exe.
---
SystemInformation.cxx | 2 +-
1 file changed, 1 insertion(+), 1 deletion(-)
diff --git a/SystemInformation.cxx b/SystemInformation.cxx
index 86fdccd..366fe30 100644
--- a/SystemInformation.cxx
+++ b/SystemInformation.cxx
@@ -1346,7 +1346,7 @@ std::string SymbolProperties::GetBinary() const
std::string binary;
char buf[1024] = { '\0' };
ssize_t ll = 0;
- if ((ll = readlink("/proc/self/exe", buf, 1024)) > 0) {
+ if ((ll = readlink("/proc/self/exe", buf, 1024)) > 0 && ll < 1024) {
buf[ll] = '\0';
binary = buf;
} else {
--
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