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Subject[PATCH] 2.4.9: let Net Devices feed Entropy (1/2)
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Date
against 2.4.9. 2.4.8-ac7 patches available in previous thread.

the following patch is a rediff of my previous patch, now against 2.4.9.
for those who are new, this patch allows user configuration of whether
net devices contribute to the entropy pool (/dev/random) by introducing
a new flag for request_irq, SA_SAMPLE_NET_RANDOM. this flag is defines
to SA_SAMPLE_RANDOM or 0 depending on the value of CONFIG_NET_RANDOM
which is configurable from Net Devices.

this is part 1, which is required. part 2 updates a handfull of devices
to use the new flag. all net devices (drivers/net/*.c) should be
updated.



diff -urN linux-2.4.9-pre4/Documentation/Configure.help linux/Documentation/Configure.help
--- linux-2.4.9-pre4/Documentation/Configure.help Wed Aug 15 23:12:28 2001
+++ linux/Documentation/Configure.help Wed Aug 15 23:19:52 2001
@@ -7728,6 +7728,19 @@

If you don't know what to use this for, you don't need it.

+Allow Net Devices to contribute to /dev/random
+CONFIG_NET_RANDOM
+ If you say Y here, network device interrupts will contribute to the
+ kernel entropy pool at /dev/random. Normally, block devices and
+ some other devices (keyboard, mouse) add to the pool. Some people,
+ however, feel that network devices should not contribute to /dev/random
+ because an external attacker could manipulate incoming packets in a
+ manner to force the pool into a determinable state. Note this is
+ completely theoretical.
+
+ If you don't mind the risk or are using a headless system and are in
+ need of more entropy, say Y.
+
Ethertap network tap (OBSOLETE)
CONFIG_ETHERTAP
If you say Y here (and have said Y to "Kernel/User network link
diff -urN linux-2.4.9-pre4/drivers/net/Config.in linux/drivers/net/Config.in
--- linux-2.4.9-pre4/drivers/net/Config.in Wed Aug 15 23:09:39 2001
+++ linux/drivers/net/Config.in Wed Aug 15 23:19:52 2001
@@ -9,6 +9,7 @@
tristate 'Bonding driver support' CONFIG_BONDING
tristate 'EQL (serial line load balancing) support' CONFIG_EQUALIZER
tristate 'Universal TUN/TAP device driver support' CONFIG_TUN
+bool 'Allow Net Devices to contribute to /dev/random' CONFIG_NET_RANDOM
if [ "$CONFIG_EXPERIMENTAL" = "y" ]; then
if [ "$CONFIG_NETLINK" = "y" ]; then
tristate 'Ethertap network tap (OBSOLETE)' CONFIG_ETHERTAP
diff -urN linux-2.4.9-pre4/include/asm-alpha/signal.h linux/include/asm-alpha/signal.h
--- linux-2.4.9-pre4/include/asm-alpha/signal.h Wed Aug 15 23:09:20 2001
+++ linux/include/asm-alpha/signal.h Wed Aug 15 23:19:52 2001
@@ -121,8 +121,20 @@
#define SA_PROBE SA_ONESHOT
#define SA_SAMPLE_RANDOM SA_RESTART
#define SA_SHIRQ 0x40000000
+
+/*
+ * Net Devices can use SA_SAMPLE_NET_RANDOM and thus only
+ * contribute to the kernel entropy pool if users want that
+ * at compile time.
+ */
+#ifdef CONFIG_NET_RANDOM
+#define SA_SAMPLE_NET_RANDOM SA_SAMPLE_RANDOM
+#else
+#define SA_SAMPLE_NET_RANDOM 0
#endif

+#endif /* __KERNEL__ */
+
#define SIG_BLOCK 1 /* for blocking signals */
#define SIG_UNBLOCK 2 /* for unblocking signals */
#define SIG_SETMASK 3 /* for setting the signal mask */
diff -urN linux-2.4.9-pre4/include/asm-arm/signal.h linux/include/asm-arm/signal.h
--- linux-2.4.9-pre4/include/asm-arm/signal.h Wed Aug 15 23:09:28 2001
+++ linux/include/asm-arm/signal.h Wed Aug 15 23:19:52 2001
@@ -124,8 +124,20 @@
#define SA_SAMPLE_RANDOM 0x10000000
#define SA_IRQNOMASK 0x08000000
#define SA_SHIRQ 0x04000000
+
+/*
+ * Net Devices can use SA_SAMPLE_NET_RANDOM and thus only
+ * contribute to the kernel entropy pool if users want that
+ * at compile time.
+ */
+#ifdef CONFIG_NET_RANDOM
+#define SA_SAMPLE_NET_RANDOM SA_SAMPLE_RANDOM
+#else
+#define SA_SAMPLE_NET_RANDOM 0
#endif

+#endif /* __KERNEL__ */
+
#define SIG_BLOCK 0 /* for blocking signals */
#define SIG_UNBLOCK 1 /* for unblocking signals */
#define SIG_SETMASK 2 /* for setting the signal mask */
diff -urN linux-2.4.9-pre4/include/asm-cris/signal.h linux/include/asm-cris/signal.h
--- linux-2.4.9-pre4/include/asm-cris/signal.h Wed Aug 15 23:09:37 2001
+++ linux/include/asm-cris/signal.h Wed Aug 15 23:19:52 2001
@@ -120,8 +120,20 @@
#define SA_PROBE SA_ONESHOT
#define SA_SAMPLE_RANDOM SA_RESTART
#define SA_SHIRQ 0x04000000
+
+/*
+ * Net Devices can use SA_SAMPLE_NET_RANDOM and thus only
+ * contribute to the kernel entropy pool if users want that
+ * at compile time.
+ */
+#ifdef CONFIG_NET_RANDOM
+#define SA_SAMPLE_NET_RANDOM SA_SAMPLE_RANDOM
+#else
+#define SA_SAMPLE_NET_RANDOM 0
#endif

+#endif /* __KERNEL__ */
+
#define SIG_BLOCK 0 /* for blocking signals */
#define SIG_UNBLOCK 1 /* for unblocking signals */
#define SIG_SETMASK 2 /* for setting the signal mask */
diff -urN linux-2.4.9-pre4/include/asm-i386/signal.h linux/include/asm-i386/signal.h
--- linux-2.4.9-pre4/include/asm-i386/signal.h Wed Aug 15 23:09:17 2001
+++ linux/include/asm-i386/signal.h Wed Aug 15 23:19:52 2001
@@ -119,8 +119,20 @@
#define SA_PROBE SA_ONESHOT
#define SA_SAMPLE_RANDOM SA_RESTART
#define SA_SHIRQ 0x04000000
+
+/*
+ * Net Devices can use SA_SAMPLE_NET_RANDOM and thus only
+ * contribute to the kernel entropy pool if users want that
+ * at compile time.
+ */
+#ifdef CONFIG_NET_RANDOM
+#define SA_SAMPLE_NET_RANDOM SA_SAMPLE_RANDOM
+#else
+#define SA_SAMPLE_NET_RANDOM 0
#endif

+#endif /* __KERNEL__ */
+
#define SIG_BLOCK 0 /* for blocking signals */
#define SIG_UNBLOCK 1 /* for unblocking signals */
#define SIG_SETMASK 2 /* for setting the signal mask */
diff -urN linux-2.4.9-pre4/include/asm-ia64/signal.h linux/include/asm-ia64/signal.h
--- linux-2.4.9-pre4/include/asm-ia64/signal.h Wed Aug 15 23:09:36 2001
+++ linux/include/asm-ia64/signal.h Wed Aug 15 23:19:52 2001
@@ -106,6 +106,17 @@
#define SA_SAMPLE_RANDOM SA_RESTART
#define SA_SHIRQ 0x04000000

+/*
+ * Net Devices can use SA_SAMPLE_NET_RANDOM and thus only
+ * contribute to the kernel entropy pool if users want that
+ * at compile time.
+ */
+#ifdef CONFIG_NET_RANDOM
+#define SA_SAMPLE_NET_RANDOM SA_SAMPLE_RANDOM
+#else
+#define SA_SAMPLE_NET_RANDOM 0
+#endif
+
#endif /* __KERNEL__ */

#define SIG_BLOCK 0 /* for blocking signals */
diff -urN linux-2.4.9-pre4/include/asm-m68k/signal.h linux/include/asm-m68k/signal.h
--- linux-2.4.9-pre4/include/asm-m68k/signal.h Wed Aug 15 23:09:21 2001
+++ linux/include/asm-m68k/signal.h Wed Aug 15 23:19:52 2001
@@ -116,8 +116,20 @@
#define SA_PROBE SA_ONESHOT
#define SA_SAMPLE_RANDOM SA_RESTART
#define SA_SHIRQ 0x04000000
+
+/*
+ * Net Devices can use SA_SAMPLE_NET_RANDOM and thus only
+ * contribute to the kernel entropy pool if users want that
+ * at compile time.
+ */
+#ifdef CONFIG_NET_RANDOM
+#define SA_SAMPLE_NET_RANDOM SA_SAMPLE_RANDOM
+#else
+#define SA_SAMPLE_NET_RANDOM 0
#endif

+#endif /* __KERNEL__ */
+
#define SIG_BLOCK 0 /* for blocking signals */
#define SIG_UNBLOCK 1 /* for unblocking signals */
#define SIG_SETMASK 2 /* for setting the signal mask */
diff -urN linux-2.4.9-pre4/include/asm-mips/signal.h linux/include/asm-mips/signal.h
--- linux-2.4.9-pre4/include/asm-mips/signal.h Wed Aug 15 23:09:18 2001
+++ linux/include/asm-mips/signal.h Wed Aug 15 23:19:52 2001
@@ -111,6 +111,17 @@
#define SA_SAMPLE_RANDOM SA_RESTART
#define SA_SHIRQ 0x02000000

+/*
+ * Net Devices can use SA_SAMPLE_NET_RANDOM and thus only
+ * contribute to the kernel entropy pool if users want that
+ * at compile time.
+ */
+#ifdef CONFIG_NET_RANDOM
+#define SA_SAMPLE_NET_RANDOM SA_SAMPLE_RANDOM
+#else
+#define SA_SAMPLE_NET_RANDOM 0
+#endif
+
#endif /* __KERNEL__ */

#define SIG_BLOCK 1 /* for blocking signals */
diff -urN linux-2.4.9-pre4/include/asm-mips64/signal.h linux/include/asm-mips64/signal.h
--- linux-2.4.9-pre4/include/asm-mips64/signal.h Wed Aug 15 23:09:37 2001
+++ linux/include/asm-mips64/signal.h Wed Aug 15 23:19:53 2001
@@ -112,6 +112,17 @@
#define SA_SAMPLE_RANDOM SA_RESTART
#define SA_SHIRQ 0x02000000

+/*
+ * Net Devices can use SA_SAMPLE_NET_RANDOM and thus only
+ * contribute to the kernel entropy pool if users want that
+ * at compile time.
+ */
+#ifdef CONFIG_NET_RANDOM
+#define SA_SAMPLE_NET_RANDOM SA_SAMPLE_RANDOM
+#else
+#define SA_SAMPLE_NET_RANDOM 0
+#endif
+
#endif /* __KERNEL__ */

#define SIG_BLOCK 1 /* for blocking signals */
diff -urN linux-2.4.9-pre4/include/asm-parisc/signal.h linux/include/asm-parisc/signal.h
--- linux-2.4.9-pre4/include/asm-parisc/signal.h Wed Aug 15 23:09:37 2001
+++ linux/include/asm-parisc/signal.h Wed Aug 15 23:19:53 2001
@@ -100,6 +100,17 @@
#define SA_SAMPLE_RANDOM SA_RESTART
#define SA_SHIRQ 0x04000000

+/*
+ * Net Devices can use SA_SAMPLE_NET_RANDOM and thus only
+ * contribute to the kernel entropy pool if users want that
+ * at compile time.
+ */
+#ifdef CONFIG_NET_RANDOM
+#define SA_SAMPLE_NET_RANDOM SA_SAMPLE_RANDOM
+#else
+#define SA_SAMPLE_NET_RANDOM 0
+#endif
+
#endif /* __KERNEL__ */

#define SIG_BLOCK 0 /* for blocking signals */
diff -urN linux-2.4.9-pre4/include/asm-ppc/signal.h linux/include/asm-ppc/signal.h
--- linux-2.4.9-pre4/include/asm-ppc/signal.h Wed Aug 15 23:09:25 2001
+++ linux/include/asm-ppc/signal.h Wed Aug 15 23:19:53 2001
@@ -114,8 +114,20 @@
#define SA_PROBE SA_ONESHOT
#define SA_SAMPLE_RANDOM SA_RESTART
#define SA_SHIRQ 0x04000000
+
+/*
+ * Net Devices can use SA_SAMPLE_NET_RANDOM and thus only
+ * contribute to the kernel entropy pool if users want that
+ * at compile time.
+ */
+#ifdef CONFIG_NET_RANDOM
+#define SA_SAMPLE_NET_RANDOM SA_SAMPLE_RANDOM
+#else
+#define SA_SAMPLE_NET_RANDOM 0
#endif

+#endif /* __KERNEL__ */
+
#define SIG_BLOCK 0 /* for blocking signals */
#define SIG_UNBLOCK 1 /* for unblocking signals */
#define SIG_SETMASK 2 /* for setting the signal mask */
diff -urN linux-2.4.9-pre4/include/asm-s390/signal.h linux/include/asm-s390/signal.h
--- linux-2.4.9-pre4/include/asm-s390/signal.h Wed Aug 15 23:09:37 2001
+++ linux/include/asm-s390/signal.h Wed Aug 15 23:20:04 2001
@@ -127,8 +127,20 @@
#define SA_PROBE SA_ONESHOT
#define SA_SAMPLE_RANDOM SA_RESTART
#define SA_SHIRQ 0x04000000
+
+/*
+ * Net Devices can use SA_SAMPLE_NET_RANDOM and thus only
+ * contribute to the kernel entropy pool if users want that
+ * at compile time.
+ */
+#ifdef CONFIG_NET_RANDOM
+#define SA_SAMPLE_NET_RANDOM SA_SAMPLE_RANDOM
+#else
+#define SA_SAMPLE_NET_RANDOM 0
#endif

+#endif /* __KERNEL__ */
+
#define SIG_BLOCK 0 /* for blocking signals */
#define SIG_UNBLOCK 1 /* for unblocking signals */
#define SIG_SETMASK 2 /* for setting the signal mask */
diff -urN linux-2.4.9-pre4/include/asm-s390x/signal.h linux/include/asm-s390x/signal.h
--- linux-2.4.9-pre4/include/asm-s390x/signal.h Wed Aug 15 23:09:37 2001
+++ linux/include/asm-s390x/signal.h Wed Aug 15 23:20:04 2001
@@ -127,8 +127,20 @@
#define SA_PROBE SA_ONESHOT
#define SA_SAMPLE_RANDOM SA_RESTART
#define SA_SHIRQ 0x04000000
+
+/*
+ * Net Devices can use SA_SAMPLE_NET_RANDOM and thus only
+ * contribute to the kernel entropy pool if users want that
+ * at compile time.
+ */
+#ifdef CONFIG_NET_RANDOM
+#define SA_SAMPLE_NET_RANDOM SA_SAMPLE_RANDOM
+#else
+#define SA_SAMPLE_NET_RANDOM 0
#endif

+#endif /* __KERNEL__ */
+
#define SIG_BLOCK 0 /* for blocking signals */
#define SIG_UNBLOCK 1 /* for unblocking signals */
#define SIG_SETMASK 2 /* for setting the signal mask */
diff -urN linux-2.4.9-pre4/include/asm-sh/signal.h linux/include/asm-sh/signal.h
--- linux-2.4.9-pre4/include/asm-sh/signal.h Wed Aug 15 23:09:29 2001
+++ linux/include/asm-sh/signal.h Wed Aug 15 23:20:04 2001
@@ -107,8 +107,20 @@
#define SA_PROBE SA_ONESHOT
#define SA_SAMPLE_RANDOM SA_RESTART
#define SA_SHIRQ 0x04000000
+
+/*
+ * Net Devices can use SA_SAMPLE_NET_RANDOM and thus only
+ * contribute to the kernel entropy pool if users want that
+ * at compile time.
+ */
+#ifdef CONFIG_NET_RANDOM
+#define SA_SAMPLE_NET_RANDOM SA_SAMPLE_RANDOM
+#else
+#define SA_SAMPLE_NET_RANDOM 0
#endif

+#endif /* __KERNEL__ */
+
#define SIG_BLOCK 0 /* for blocking signals */
#define SIG_UNBLOCK 1 /* for unblocking signals */
#define SIG_SETMASK 2 /* for setting the signal mask */
diff -urN linux-2.4.9-pre4/include/asm-sparc/signal.h linux/include/asm-sparc/signal.h
--- linux-2.4.9-pre4/include/asm-sparc/signal.h Wed Aug 15 23:09:23 2001
+++ linux/include/asm-sparc/signal.h Wed Aug 15 23:20:04 2001
@@ -176,8 +176,20 @@
#define SA_PROBE SA_ONESHOT
#define SA_SAMPLE_RANDOM SA_RESTART
#define SA_STATIC_ALLOC 0x80
+
+/*
+ * Net Devices can use SA_SAMPLE_NET_RANDOM and thus only
+ * contribute to the kernel entropy pool if users want that
+ * at compile time.
+ */
+#ifdef CONFIG_NET_RANDOM
+#define SA_SAMPLE_NET_RANDOM SA_SAMPLE_RANDOM
+#else
+#define SA_SAMPLE_NET_RANDOM 0
#endif

+#endif /* __KERNEL__ */
+
/* Type of a signal handler. */
#ifdef __KERNEL__
typedef void (*__sighandler_t)(int, int, struct sigcontext *, char *);
diff -urN linux-2.4.9-pre4/include/asm-sparc64/signal.h linux/include/asm-sparc64/signal.h
--- linux-2.4.9-pre4/include/asm-sparc64/signal.h Wed Aug 15 23:09:27 2001
+++ linux/include/asm-sparc64/signal.h Wed Aug 15 23:20:04 2001
@@ -192,8 +192,20 @@
#define SA_PROBE SA_ONESHOT
#define SA_SAMPLE_RANDOM SA_RESTART
#define SA_STATIC_ALLOC 0x80
+
+/*
+ * Net Devices can use SA_SAMPLE_NET_RANDOM and thus only
+ * contribute to the kernel entropy pool if users want that
+ * at compile time.
+ */
+#ifdef CONFIG_NET_RANDOM
+#define SA_SAMPLE_NET_RANDOM SA_SAMPLE_RANDOM
+#else
+#define SA_SAMPLE_NET_RANDOM 0
#endif

+#endif /* __KERNEL__ */
+
/* Type of a signal handler. */
#ifdef __KERNEL__
typedef void (*__sighandler_t)(int, struct sigcontext *);




--
Robert M. Love
rml at ufl.edu
rml at tech9.net

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