5 files changed, 301 insertions, 1 deletions

diff --git a/Documentation/feature-removal-schedule.txt b/Documentation/feature-removal-schedule.txt
index af0e9393bf68..309c47b91598 100644
--- a/Documentation/feature-removal-schedule.txt
+++ b/Documentation/feature-removal-schedule.txt
@@ -282,6 +282,13 @@ Why:	Not used in-tree. The current out-of-tree users used it to
         out-of-tree driver.
 Who:    Thomas Gleixner <tglx@linutronix.de>
 
+----------------------------
+
+What:   usedac i386 kernel parameter
+When:   2.6.27
+Why:    replaced by allowdac and no dac combination
+Who:    Glauber Costa <gcosta@redhat.com>
+
 ---------------------------
 
 What:   /sys/o2cb symlink
diff --git a/Documentation/kernel-parameters.txt b/Documentation/kernel-parameters.txt
index 4b0f1ae31a4c..f4839606988b 100644
--- a/Documentation/kernel-parameters.txt
+++ b/Documentation/kernel-parameters.txt
@@ -1280,8 +1280,16 @@ and is between 256 and 4096 characters. It is defined in the file
         noexec          [IA-64]
 
         noexec          [X86-32,X86-64]
+                        On X86-32 available only on PAE configured kernels.
                         noexec=on: enable non-executable mappings (default)
-                        noexec=off: disable nn-executable mappings
+                        noexec=off: disable non-executable mappings
+
+        noexec32        [X86-64]
+                        This affects only 32-bit executables.
+                        noexec32=on: enable non-executable mappings (default)
+                                read doesn't imply executable mappings
+                        noexec32=off: disable non-executable mappings
+                                read implies executable mappings
 
         nofxsr          [BUGS=X86-32] Disables x86 floating point extended
                         register save and restore. The kernel will only save
diff --git a/Documentation/prctl/disable-tsc-ctxt-sw-stress-test.c b/Documentation/prctl/disable-tsc-ctxt-sw-stress-test.c
new file mode 100644
index 000000000000..f8e8e95e81fd
--- /dev/null
+++ b/Documentation/prctl/disable-tsc-ctxt-sw-stress-test.c
@@ -0,0 +1,96 @@
+/*
+ * Tests for prctl(PR_GET_TSC, ...) / prctl(PR_SET_TSC, ...)
+ *
+ * Tests if the control register is updated correctly
+ * at context switches
+ *
+ * Warning: this test will cause a very high load for a few seconds
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <signal.h>
+#include <inttypes.h>
+#include <wait.h>
+
+
+#include <sys/prctl.h>
+#include <linux/prctl.h>
+
+/* Get/set the process' ability to use the timestamp counter instruction */
+#ifndef PR_GET_TSC
+#define PR_GET_TSC 25
+#define PR_SET_TSC 26
+# define PR_TSC_ENABLE          1   /* allow the use of the timestamp counter */
+# define PR_TSC_SIGSEGV         2   /* throw a SIGSEGV instead of reading the TSC */
+#endif
+
+uint64_t rdtsc() {
+uint32_t lo, hi;
+/* We cannot use "=A", since this would use %rax on x86_64 */
+__asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi));
+return (uint64_t)hi << 32 | lo;
+}
+
+void sigsegv_expect(int sig)
+{
+        /* */
+}
+
+void segvtask(void)
+{
+        if (prctl(PR_SET_TSC, PR_TSC_SIGSEGV) < 0)
+        {
+                perror("prctl");
+                exit(0);
+        }
+        signal(SIGSEGV, sigsegv_expect);
+        alarm(10);
+        rdtsc();
+        fprintf(stderr, "FATAL ERROR, rdtsc() succeeded while disabled\n");
+        exit(0);
+}
+
+
+void sigsegv_fail(int sig)
+{
+        fprintf(stderr, "FATAL ERROR, rdtsc() failed while enabled\n");
+        exit(0);
+}
+
+void rdtsctask(void)
+{
+        if (prctl(PR_SET_TSC, PR_TSC_ENABLE) < 0)
+        {
+                perror("prctl");
+                exit(0);
+        }
+        signal(SIGSEGV, sigsegv_fail);
+        alarm(10);
+        for(;;) rdtsc();
+}
+
+
+int main(int argc, char **argv)
+{
+        int n_tasks = 100, i;
+
+        fprintf(stderr, "[No further output means we're allright]\n");
+
+        for (i=0; i<n_tasks; i++)
+                if (fork() == 0)
+                {
+                        if (i & 1)
+                                segvtask();
+                        else
+                                rdtsctask();
+                }
+
+        for (i=0; i<n_tasks; i++)
+                wait(NULL);
+
+        exit(0);
+}
+
diff --git a/Documentation/prctl/disable-tsc-on-off-stress-test.c b/Documentation/prctl/disable-tsc-on-off-stress-test.c
new file mode 100644
index 000000000000..1fcd91445375
--- /dev/null
+++ b/Documentation/prctl/disable-tsc-on-off-stress-test.c
@@ -0,0 +1,95 @@
+/*
+ * Tests for prctl(PR_GET_TSC, ...) / prctl(PR_SET_TSC, ...)
+ *
+ * Tests if the control register is updated correctly
+ * when set with prctl()
+ *
+ * Warning: this test will cause a very high load for a few seconds
+ *
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <signal.h>
+#include <inttypes.h>
+#include <wait.h>
+
+
+#include <sys/prctl.h>
+#include <linux/prctl.h>
+
+/* Get/set the process' ability to use the timestamp counter instruction */
+#ifndef PR_GET_TSC
+#define PR_GET_TSC 25
+#define PR_SET_TSC 26
+# define PR_TSC_ENABLE          1   /* allow the use of the timestamp counter */
+# define PR_TSC_SIGSEGV         2   /* throw a SIGSEGV instead of reading the TSC */
+#endif
+
+/* snippet from wikipedia :-) */
+
+uint64_t rdtsc() {
+uint32_t lo, hi;
+/* We cannot use "=A", since this would use %rax on x86_64 */
+__asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi));
+return (uint64_t)hi << 32 | lo;
+}
+
+int should_segv = 0;
+
+void sigsegv_cb(int sig)
+{
+        if (!should_segv)
+        {
+                fprintf(stderr, "FATAL ERROR, rdtsc() failed while enabled\n");
+                exit(0);
+        }
+        if (prctl(PR_SET_TSC, PR_TSC_ENABLE) < 0)
+        {
+                perror("prctl");
+                exit(0);
+        }
+        should_segv = 0;
+
+        rdtsc();
+}
+
+void task(void)
+{
+        signal(SIGSEGV, sigsegv_cb);
+        alarm(10);
+        for(;;)
+        {
+                rdtsc();
+                if (should_segv)
+                {
+                        fprintf(stderr, "FATAL ERROR, rdtsc() succeeded while disabled\n");
+                        exit(0);
+                }
+                if (prctl(PR_SET_TSC, PR_TSC_SIGSEGV) < 0)
+                {
+                        perror("prctl");
+                        exit(0);
+                }
+                should_segv = 1;
+        }
+}
+
+
+int main(int argc, char **argv)
+{
+        int n_tasks = 100, i;
+
+        fprintf(stderr, "[No further output means we're allright]\n");
+
+        for (i=0; i<n_tasks; i++)
+                if (fork() == 0)
+                        task();
+
+        for (i=0; i<n_tasks; i++)
+                wait(NULL);
+
+        exit(0);
+}
+
diff --git a/Documentation/prctl/disable-tsc-test.c b/Documentation/prctl/disable-tsc-test.c
new file mode 100644
index 000000000000..843c81eac235
--- /dev/null
+++ b/Documentation/prctl/disable-tsc-test.c
@@ -0,0 +1,94 @@
+/*
+ * Tests for prctl(PR_GET_TSC, ...) / prctl(PR_SET_TSC, ...)
+ *
+ * Basic test to test behaviour of PR_GET_TSC and PR_SET_TSC
+ */
+
+#include <stdio.h>
+#include <stdlib.h>
+#include <unistd.h>
+#include <signal.h>
+#include <inttypes.h>
+
+
+#include <sys/prctl.h>
+#include <linux/prctl.h>
+
+/* Get/set the process' ability to use the timestamp counter instruction */
+#ifndef PR_GET_TSC
+#define PR_GET_TSC 25
+#define PR_SET_TSC 26
+# define PR_TSC_ENABLE          1   /* allow the use of the timestamp counter */
+# define PR_TSC_SIGSEGV         2   /* throw a SIGSEGV instead of reading the TSC */
+#endif
+
+const char *tsc_names[] =
+{
+        [0] = "[not set]",
+        [PR_TSC_ENABLE] = "PR_TSC_ENABLE",
+        [PR_TSC_SIGSEGV] = "PR_TSC_SIGSEGV",
+};
+
+uint64_t rdtsc() {
+uint32_t lo, hi;
+/* We cannot use "=A", since this would use %rax on x86_64 */
+__asm__ __volatile__ ("rdtsc" : "=a" (lo), "=d" (hi));
+return (uint64_t)hi << 32 | lo;
+}
+
+void sigsegv_cb(int sig)
+{
+        int tsc_val = 0;
+
+        printf("[ SIG_SEGV ]\n");
+        printf("prctl(PR_GET_TSC, &tsc_val); ");
+        fflush(stdout);
+
+        if ( prctl(PR_GET_TSC, &tsc_val) == -1)
+                perror("prctl");
+
+        printf("tsc_val == %s\n", tsc_names[tsc_val]);
+        printf("prctl(PR_SET_TSC, PR_TSC_ENABLE)\n");
+        fflush(stdout);
+        if ( prctl(PR_SET_TSC, PR_TSC_ENABLE) == -1)
+                perror("prctl");
+
+        printf("rdtsc() == ");
+}
+
+int main(int argc, char **argv)
+{
+        int tsc_val = 0;
+
+        signal(SIGSEGV, sigsegv_cb);
+
+        printf("rdtsc() == %llu\n", (unsigned long long)rdtsc());
+        printf("prctl(PR_GET_TSC, &tsc_val); ");
+        fflush(stdout);
+
+        if ( prctl(PR_GET_TSC, &tsc_val) == -1)
+                perror("prctl");
+
+        printf("tsc_val == %s\n", tsc_names[tsc_val]);
+        printf("rdtsc() == %llu\n", (unsigned long long)rdtsc());
+        printf("prctl(PR_SET_TSC, PR_TSC_ENABLE)\n");
+        fflush(stdout);
+
+        if ( prctl(PR_SET_TSC, PR_TSC_ENABLE) == -1)
+                perror("prctl");
+
+        printf("rdtsc() == %llu\n", (unsigned long long)rdtsc());
+        printf("prctl(PR_SET_TSC, PR_TSC_SIGSEGV)\n");
+        fflush(stdout);
+
+        if ( prctl(PR_SET_TSC, PR_TSC_SIGSEGV) == -1)
+                perror("prctl");
+
+        printf("rdtsc() == ");
+        fflush(stdout);
+        printf("%llu\n", (unsigned long long)rdtsc());
+        fflush(stdout);
+
+        exit(EXIT_SUCCESS);
+}
+