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| author | Amitay Isaacs <amitay@gmail.com> | 2014-06-10 17:04:34 +1000 |
|---|---|---|
| committer | Martin Schwenke <martins@samba.org> | 2014-06-12 05:40:10 +0200 |
| commit | 507207e40b193ba753604666c56dfa29c29b7145 (patch) | |
| tree | 748e4cae54252ba849a398bba6c66b53dff50623 /ctdb/common/system_util.c | |
| parent | 8c8ef5640e17c1acbda99921277a41442bcc4801 (diff) | |
| download | samba-507207e40b193ba753604666c56dfa29c29b7145.tar.gz samba-507207e40b193ba753604666c56dfa29c29b7145.tar.xz samba-507207e40b193ba753604666c56dfa29c29b7145.zip | |
ctdb-common: Move lockdown_memory to system utilities
Signed-off-by: Amitay Isaacs <amitay@gmail.com>
Reviewed-by: Martin Schwenke <martin@meltin.net>
Diffstat (limited to 'ctdb/common/system_util.c')
| -rw-r--r-- | ctdb/common/system_util.c | 28 |
1 files changed, 28 insertions, 0 deletions
diff --git a/ctdb/common/system_util.c b/ctdb/common/system_util.c index 4f6401690b..d2d9b31e82 100644 --- a/ctdb/common/system_util.c +++ b/ctdb/common/system_util.c @@ -20,6 +20,7 @@ #include "includes.h" #include "system/filesys.h" +#include "system/shmem.h" #include <libgen.h> @@ -275,6 +276,33 @@ bool parse_ip_port(const char *addr, ctdb_sock_addr *saddr) return ret; } +/* we don't lock future pages here; it would increase the chance that + * we'd fail to mmap later on. */ +void lockdown_memory(bool valgrinding) +{ +#if defined(HAVE_MLOCKALL) && !defined(_AIX_) + /* Extra stack, please! */ + char dummy[10000]; + memset(dummy, 0, sizeof(dummy)); + + if (valgrinding) { + return; + } + + /* Ignore when running in local daemons mode */ + if (getuid() != 0) { + return; + } + + /* Avoid compiler optimizing out dummy. */ + mlock(dummy, sizeof(dummy)); + if (mlockall(MCL_CURRENT) != 0) { + DEBUG(DEBUG_WARNING,("Failed to lockdown memory: %s'\n", + strerror(errno))); + } +#endif +} + int mkdir_p(const char *dir, int mode) { char t[PATH_MAX]; |