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-rw-r--r--apt-pkg/contrib/fileutl.cc27
1 files changed, 16 insertions, 11 deletions
diff --git a/apt-pkg/contrib/fileutl.cc b/apt-pkg/contrib/fileutl.cc
index 86eec7c36..844a6bd3c 100644
--- a/apt-pkg/contrib/fileutl.cc
+++ b/apt-pkg/contrib/fileutl.cc
@@ -2165,27 +2165,32 @@ bool Popen(const char* Args[], FileFd &Fd, pid_t &Child, FileFd::OpenMode Mode)/
/*}}}*/
bool DropPrivileges() /*{{{*/
{
+ if(_config->FindB("Debug::NoDropPrivs", false) == true)
+ return true;
+
+#if __gnu_linux__
+#if defined(PR_SET_NO_NEW_PRIVS) && ( PR_SET_NO_NEW_PRIVS != 38 )
+#error "PR_SET_NO_NEW_PRIVS is defined, but with a different value than expected!"
+#endif
+ // see prctl(2), needs linux3.5 at runtime - magic constant to avoid it at buildtime
+ int ret = prctl(38, 1, 0, 0, 0);
+ // ignore EINVAL - kernel is too old to understand the option
+ if(ret < 0 && errno != EINVAL)
+ _error->Warning("PR_SET_NO_NEW_PRIVS failed with %i", ret);
+#endif
+
// uid will be 0 in the end, but gid might be different anyway
- uid_t old_uid = getuid();
- gid_t old_gid = getgid();
+ uid_t const old_uid = getuid();
+ gid_t const old_gid = getgid();
if (old_uid != 0)
return true;
- if(_config->FindB("Debug::NoDropPrivs", false) == true)
- return true;
const std::string toUser = _config->Find("APT::Sandbox::User", "_apt");
struct passwd *pw = getpwnam(toUser.c_str());
if (pw == NULL)
return _error->Error("No user %s, can not drop rights", toUser.c_str());
-#if __gnu_linux__
- // see prctl(2), needs linux3.5
- int ret = prctl(PR_SET_NO_NEW_PRIVS, 1, 0, 0, 0);
- // ignore EINVAL - kernel is too old to understand the option
- if(ret < 0 && errno != EINVAL)
- _error->Warning("PR_SET_NO_NEW_PRIVS failed with %i", ret);
-#endif
// Do not change the order here, it might break things
if (setgroups(1, &pw->pw_gid))
return _error->Errno("setgroups", "Failed to setgroups");