Blame SOURCES/0013-Ticket-48925-slapd-crash-with-SIGILL-Dsktune-should-.patch

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From 9f8d3fc5bd7cb1e00b6bd48669b8074849f4c5da Mon Sep 17 00:00:00 2001
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From: William Brown <firstyear@redhat.com>
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Date: Thu, 14 Jul 2016 13:47:11 +1000
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Subject: [PATCH 13/15] Ticket 48925 - slapd crash with SIGILL: Dsktune should
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 detect lack of CMPXCHG16B
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Bug Description:  On older AMD the CMPXCHG16B is not present. This is critical
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to the correct operation of lfds. Without out it we are unable to use nunc-stans
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Fix Description:  dsktune should warn if CMPXCHG16B (flag cx16) is not present.
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In a future release we will NOT allow installation upon a platform that lacks
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this instruction.
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https://fedorahosted.org/389/ticket/48925
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Author: wibrown
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Review by: nhosoi (Thank you!)
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(cherry picked from commit 5eb19778f7939967e8ca714c4d4cb03ffa11064d)
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---
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 ldap/systools/idsktune.c | 40 +++++++++++++++++++++++++++++++++++++++-
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 1 file changed, 39 insertions(+), 1 deletion(-)
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diff --git a/ldap/systools/idsktune.c b/ldap/systools/idsktune.c
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index c7e76e7..b6c352a 100644
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--- a/ldap/systools/idsktune.c
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+++ b/ldap/systools/idsktune.c
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@@ -11,11 +11,12 @@
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 #  include <config.h>
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 #endif
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+#define _GNU_SOURCE
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 /* !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!
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  *    Don't forget to update build_date when the patch sets are updated. 
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  * !!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!!! */
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-static char *build_date = "23-FEBRUARY-2012";
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+static char *build_date = "14-JULY-2016";
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 #if defined(linux) || defined(__linux) || defined(__linux__)
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 #define IDDS_LINUX_INCLUDE 1
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@@ -32,10 +33,12 @@ static char *build_date = "23-FEBRUARY-2012";
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 #include <sys resource.h="">
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 #include <unistd.h>
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 #endif
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+
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 #include <stdlib.h>
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 #include <string.h>
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 #include <errno.h>
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 #include <ctype.h>
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+
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 #if !defined(__VMS) && !defined(IDDS_LINUX_INCLUDE)
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 #if defined(__hpux) && defined(f_type)
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 #undef f_type
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@@ -864,6 +867,39 @@ done:
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         free(cmd);
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     }
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 }
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+
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+
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+static void
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+linux_check_cpu_features(void)
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+{
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+    FILE *cpuinfo = fopen("/proc/cpuinfo", "rb");
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+    char *arg = 0;
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+    char *token = NULL;
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+    size_t size = 0;
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+    int found = 0;
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+    while(getline(&arg, &size, cpuinfo) != -1)
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+    {
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+        if (strncmp("flags", arg, 5) == 0) {
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+            token = strtok(arg, " ");
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+            while (token != NULL) {
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+                if (strncmp(token, "cx16", 4) == 0) {
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+                    found += 1;
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+                }
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+                token = strtok(NULL, " ");
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+            }
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+        }
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+    }
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+    free(arg);
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+    fclose(cpuinfo);
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+
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+    if (found == 0) {
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+        flag_os_bad = 1;
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+        printf("ERROR: This system does not support CMPXCHG16B instruction (cpuflag cx16).\n");
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+        printf("       nsslapd-enable-nunc-stans must be set to "off" on this system. \n");
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+        printf("       In a future release of Directory Server this platform will NOT be supported.\n\n");
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+    }
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+
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+}
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 #endif /* IDDS_LINUX_INCLUDE */
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@@ -976,6 +1012,8 @@ static void gen_tests (void)
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 #if defined(IDDS_LINUX_INCLUDE)
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     linux_check_release();
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+
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+    linux_check_cpu_features();
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 #endif
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-- 
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2.4.11
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