| 1 |
Index: linux-2.6.26-gentoo/arch/alpha/Kconfig
|
| 2 |
===================================================================
|
| 3 |
--- linux-2.6.26-gentoo.orig/arch/alpha/Kconfig
|
| 4 |
+++ linux-2.6.26-gentoo/arch/alpha/Kconfig
|
| 5 |
@@ -624,6 +624,32 @@ config HZ
|
| 6 |
default 1200 if ALPHA_RAWHIDE
|
| 7 |
default 1024
|
| 8 |
|
| 9 |
+config ALPHA_UAC_SYSCTL
|
| 10 |
+ bool "Configure UAC policy via sysctl"
|
| 11 |
+ depends on SYSCTL
|
| 12 |
+ default y
|
| 13 |
+ ---help---
|
| 14 |
+ Configuring the UAC (unaligned access control) policy on a Linux
|
| 15 |
+ system usually involves setting a compile time define. If you say
|
| 16 |
+ Y here, you will be able to modify the UAC policy at runtime using
|
| 17 |
+ the /proc interface.
|
| 18 |
+
|
| 19 |
+ The UAC policy defines the action Linux should take when an
|
| 20 |
+ unaligned memory access occurs. The action can include printing a
|
| 21 |
+ warning message (NOPRINT), sending a signal to the offending
|
| 22 |
+ program to help developers debug their applications (SIGBUS), or
|
| 23 |
+ disabling the transparent fixing (NOFIX).
|
| 24 |
+
|
| 25 |
+ The sysctls will be initialized to the compile-time defined UAC
|
| 26 |
+ policy. You can change these manually, or with the sysctl(8)
|
| 27 |
+ userspace utility.
|
| 28 |
+
|
| 29 |
+ To disable the warning messages at runtime, you would use
|
| 30 |
+
|
| 31 |
+ echo 1 > /proc/sys/kernel/uac/noprint
|
| 32 |
+
|
| 33 |
+ This is pretty harmless. Say Y if you're not sure.
|
| 34 |
+
|
| 35 |
source "drivers/pci/Kconfig"
|
| 36 |
source "drivers/eisa/Kconfig"
|
| 37 |
|
| 38 |
Index: linux-2.6.26-gentoo/arch/alpha/kernel/traps.c
|
| 39 |
===================================================================
|
| 40 |
--- linux-2.6.26-gentoo.orig/arch/alpha/kernel/traps.c
|
| 41 |
+++ linux-2.6.26-gentoo/arch/alpha/kernel/traps.c
|
| 42 |
@@ -103,6 +103,52 @@ static char * ireg_name[] = {"v0", "t0",
|
| 43 |
"t10", "t11", "ra", "pv", "at", "gp", "sp", "zero"};
|
| 44 |
#endif
|
| 45 |
|
| 46 |
+#ifdef CONFIG_ALPHA_UAC_SYSCTL
|
| 47 |
+
|
| 48 |
+#include <linux/sysctl.h>
|
| 49 |
+
|
| 50 |
+static int enabled_noprint = 0;
|
| 51 |
+static int enabled_sigbus = 0;
|
| 52 |
+static int enabled_nofix = 0;
|
| 53 |
+
|
| 54 |
+ctl_table uac_table[] = {
|
| 55 |
+ {
|
| 56 |
+ .ctl_name = CTL_UNNUMBERED,
|
| 57 |
+ .procname = "noprint",
|
| 58 |
+ .data = &enabled_noprint,
|
| 59 |
+ .maxlen = sizeof (int),
|
| 60 |
+ .mode = 0644,
|
| 61 |
+ .proc_handler = &proc_dointvec,
|
| 62 |
+ },
|
| 63 |
+ {
|
| 64 |
+ .ctl_name = CTL_UNNUMBERED,
|
| 65 |
+ .procname = "sigbus",
|
| 66 |
+ .data = &enabled_sigbus,
|
| 67 |
+ .maxlen = sizeof (int),
|
| 68 |
+ .mode = 0644,
|
| 69 |
+ .proc_handler = &proc_dointvec,
|
| 70 |
+ },
|
| 71 |
+ {
|
| 72 |
+ .ctl_name = CTL_UNNUMBERED,
|
| 73 |
+ .procname = "nofix",
|
| 74 |
+ .data = &enabled_nofix,
|
| 75 |
+ .maxlen = sizeof (int),
|
| 76 |
+ .mode = 0644,
|
| 77 |
+ .proc_handler = &proc_dointvec,
|
| 78 |
+ },
|
| 79 |
+ { .ctl_name = 0 }
|
| 80 |
+};
|
| 81 |
+
|
| 82 |
+static int __init init_uac_sysctl(void)
|
| 83 |
+{
|
| 84 |
+ /* Initialize sysctls with the #defined UAC policy */
|
| 85 |
+ enabled_noprint = (test_thread_flag (TIF_UAC_NOPRINT)) ? 1 : 0;
|
| 86 |
+ enabled_sigbus = (test_thread_flag (TIF_UAC_SIGBUS)) ? 1 : 0;
|
| 87 |
+ enabled_nofix = (test_thread_flag (TIF_UAC_NOFIX)) ? 1 : 0;
|
| 88 |
+ return 0;
|
| 89 |
+}
|
| 90 |
+#endif
|
| 91 |
+
|
| 92 |
static void
|
| 93 |
dik_show_code(unsigned int *pc)
|
| 94 |
{
|
| 95 |
@@ -782,7 +828,11 @@ do_entUnaUser(void __user * va, unsigned
|
| 96 |
/* Check the UAC bits to decide what the user wants us to do
|
| 97 |
with the unaliged access. */
|
| 98 |
|
| 99 |
+#ifndef CONFIG_ALPHA_UAC_SYSCTL
|
| 100 |
if (!test_thread_flag (TIF_UAC_NOPRINT)) {
|
| 101 |
+#else /* CONFIG_ALPHA_UAC_SYSCTL */
|
| 102 |
+ if (!(enabled_noprint)) {
|
| 103 |
+#endif /* CONFIG_ALPHA_UAC_SYSCTL */
|
| 104 |
if (cnt >= 5 && time_after(jiffies, last_time + 5 * HZ)) {
|
| 105 |
cnt = 0;
|
| 106 |
}
|
| 107 |
@@ -793,10 +843,18 @@ do_entUnaUser(void __user * va, unsigned
|
| 108 |
}
|
| 109 |
last_time = jiffies;
|
| 110 |
}
|
| 111 |
+#ifndef CONFIG_ALPHA_UAC_SYSCTL
|
| 112 |
if (test_thread_flag (TIF_UAC_SIGBUS))
|
| 113 |
+#else /* CONFIG_ALPHA_UAC_SYSCTL */
|
| 114 |
+ if (enabled_sigbus)
|
| 115 |
+#endif /* CONFIG_ALPHA_UAC_SYSCTL */
|
| 116 |
goto give_sigbus;
|
| 117 |
/* Not sure why you'd want to use this, but... */
|
| 118 |
+#ifndef CONFIG_ALPHA_UAC_SYSCTL
|
| 119 |
if (test_thread_flag (TIF_UAC_NOFIX))
|
| 120 |
+#else /* CONFIG_ALPHA_UAC_SYSCTL */
|
| 121 |
+ if (enabled_nofix)
|
| 122 |
+#endif /* CONFIG_ALPHA_UAC_SYSCTL */
|
| 123 |
return;
|
| 124 |
|
| 125 |
/* Don't bother reading ds in the access check since we already
|
| 126 |
@@ -1091,3 +1149,7 @@ trap_init(void)
|
| 127 |
wrent(entSys, 5);
|
| 128 |
wrent(entDbg, 6);
|
| 129 |
}
|
| 130 |
+
|
| 131 |
+#ifdef CONFIG_ALPHA_UAC_SYSCTL
|
| 132 |
+ __initcall(init_uac_sysctl);
|
| 133 |
+#endif
|
| 134 |
Index: linux-2.6.26-gentoo/kernel/sysctl.c
|
| 135 |
===================================================================
|
| 136 |
--- linux-2.6.26-gentoo.orig/kernel/sysctl.c
|
| 137 |
+++ linux-2.6.26-gentoo/kernel/sysctl.c
|
| 138 |
@@ -177,6 +177,9 @@ extern struct ctl_table random_table[];
|
| 139 |
#ifdef CONFIG_INOTIFY_USER
|
| 140 |
extern struct ctl_table inotify_table[];
|
| 141 |
#endif
|
| 142 |
+#ifdef CONFIG_ALPHA_UAC_SYSCTL
|
| 143 |
+extern struct ctl_table uac_table[];
|
| 144 |
+#endif
|
| 145 |
|
| 146 |
#ifdef HAVE_ARCH_PICK_MMAP_LAYOUT
|
| 147 |
int sysctl_legacy_va_layout;
|
| 148 |
@@ -832,6 +835,14 @@ static struct ctl_table kern_table[] = {
|
| 149 |
* NOTE: do not add new entries to this table unless you have read
|
| 150 |
* Documentation/sysctl/ctl_unnumbered.txt
|
| 151 |
*/
|
| 152 |
+#ifdef CONFIG_ALPHA_UAC_SYSCTL
|
| 153 |
+ {
|
| 154 |
+ .ctl_name = CTL_UNNUMBERED,
|
| 155 |
+ .procname = "uac",
|
| 156 |
+ .mode = 0555,
|
| 157 |
+ .child = uac_table,
|
| 158 |
+ },
|
| 159 |
+#endif /* CONFIG_ALPHA_UAC_SYSCTL */
|
| 160 |
{ .ctl_name = 0 }
|
| 161 |
};
|
| 162 |
|
Parent Directory
| 
Revision Log