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SubjectRe: Patch 1/6 introduce sysctl

This first patch of the series introduces a sysctl (default off) that
enables/disables the randomisation feature globally. Since randomisation may
make it harder to debug really tricky situations (reproducability goes
down), the sysadmin needs a way to disable it globally.

Signed-off-by: Arjan van de Ven <arjan@infradead.org>


diff -purN linux-2.6.11-rc2-bk4/include/linux/kernel.h linux-step-1/include/linux/kernel.h
--- linux-2.6.11-rc2-bk4/include/linux/kernel.h 2005-01-26 18:24:39.000000000 +0100
+++ linux-step-1/include/linux/kernel.h 2005-01-26 19:04:58.016540168 +0100
@@ -278,6 +278,9 @@ struct sysinfo {
extern void BUILD_BUG(void);
#define BUILD_BUG_ON(condition) do { if (condition) BUILD_BUG(); } while(0)

+
+extern int randomize_va_space;
+
/* Trap pasters of __FUNCTION__ at compile-time */
#if __GNUC__ > 2 || __GNUC_MINOR__ >= 95
#define __FUNCTION__ (__func__)
diff -purN linux-2.6.11-rc2-bk4/include/linux/sysctl.h linux-step-1/include/linux/sysctl.h
--- linux-2.6.11-rc2-bk4/include/linux/sysctl.h 2005-01-26 18:24:39.000000000 +0100
+++ linux-step-1/include/linux/sysctl.h 2005-01-26 19:01:13.640650488 +0100
@@ -135,6 +135,7 @@ enum
KERN_HZ_TIMER=65, /* int: hz timer on or off */
KERN_UNKNOWN_NMI_PANIC=66, /* int: unknown nmi panic flag */
KERN_BOOTLOADER_TYPE=67, /* int: boot loader type */
+ KERN_RANDOMIZE=68, /* int: randomize virtual address space */
};


diff -purN linux-2.6.11-rc2-bk4/kernel/sysctl.c linux-step-1/kernel/sysctl.c
--- linux-2.6.11-rc2-bk4/kernel/sysctl.c 2005-01-26 18:24:39.000000000 +0100
+++ linux-step-1/kernel/sysctl.c 2005-01-26 19:03:44.000000000 +0100
@@ -122,6 +122,8 @@ extern int sysctl_hz_timer;
extern int acct_parm[];
#endif

+int randomize_va_space = 0;
+
static int parse_table(int __user *, int, void __user *, size_t __user *, void __user *, size_t,
ctl_table *, void **);
static int proc_doutsstring(ctl_table *table, int write, struct file *filp,
@@ -633,6 +635,15 @@ static ctl_table kern_table[] = {
.proc_handler = &proc_dointvec,
},
#endif
+ {
+ .ctl_name = KERN_RANDOMIZE,
+ .procname = "randomize_va_space",
+ .data = &randomize_va_space,
+ .maxlen = sizeof(int),
+ .mode = 0644,
+ .proc_handler = &proc_dointvec,
+ },
+
{ .ctl_name = 0 }
};

-
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