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authorLinus Torvalds <torvalds@linux-foundation.org>2013-08-25 12:41:37 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2013-08-25 12:41:37 -0700
commit1b4757ee6f47502ca82782d270ccdc1caac8fc8e (patch)
tree7581c2497bedf172ff9a67a44cec065e2b36f598
parent4d4323ea2dbb506a29260a41b554dfc7de79249e (diff)
parente1f020371c08ea93be417ba3b1990b169e7e6e36 (diff)
downloadlinux-stericsson-1b4757ee6f47502ca82782d270ccdc1caac8fc8e.tar.gz
Merge branch 'fixes' of git://git.linaro.org/people/rmk/linux-arm
Pull ARM fixes from Russell King: "This round of fixes is smaller than previous: a couple more updates for the security fixes, and a one-liner kexec fix" * 'fixes' of git://git.linaro.org/people/rmk/linux-arm: ARM: 7816/1: CONFIG_KUSER_HELPERS: fix help text ARM: 7815/1: kexec: offline non panic CPUs on Kdump panic ARM: 7819/1: fiq: Cast the first argument of flush_icache_range()
-rw-r--r--arch/arm/kernel/fiq.c3
-rw-r--r--arch/arm/kernel/machine_kexec.c1
-rw-r--r--arch/arm/mm/Kconfig9
3 files changed, 9 insertions, 4 deletions
diff --git a/arch/arm/kernel/fiq.c b/arch/arm/kernel/fiq.c
index fc7920288a3d..918875d96d5d 100644
--- a/arch/arm/kernel/fiq.c
+++ b/arch/arm/kernel/fiq.c
@@ -89,7 +89,8 @@ void set_fiq_handler(void *start, unsigned int length)
memcpy(base + offset, start, length);
if (!cache_is_vipt_nonaliasing())
- flush_icache_range(base + offset, offset + length);
+ flush_icache_range((unsigned long)base + offset, offset +
+ length);
flush_icache_range(0xffff0000 + offset, 0xffff0000 + offset + length);
}
diff --git a/arch/arm/kernel/machine_kexec.c b/arch/arm/kernel/machine_kexec.c
index d7c82df69243..57221e349a7c 100644
--- a/arch/arm/kernel/machine_kexec.c
+++ b/arch/arm/kernel/machine_kexec.c
@@ -82,6 +82,7 @@ void machine_crash_nonpanic_core(void *unused)
crash_save_cpu(&regs, smp_processor_id());
flush_cache_all();
+ set_cpu_online(smp_processor_id(), false);
atomic_dec(&waiting_for_crash_ipi);
while (1)
cpu_relax();
diff --git a/arch/arm/mm/Kconfig b/arch/arm/mm/Kconfig
index db5c2cab8fda..cd2c88e7a8f7 100644
--- a/arch/arm/mm/Kconfig
+++ b/arch/arm/mm/Kconfig
@@ -809,15 +809,18 @@ config KUSER_HELPERS
the CPU type fitted to the system. This permits binaries to be
run on ARMv4 through to ARMv7 without modification.
+ See Documentation/arm/kernel_user_helpers.txt for details.
+
However, the fixed address nature of these helpers can be used
by ROP (return orientated programming) authors when creating
exploits.
If all of the binaries and libraries which run on your platform
are built specifically for your platform, and make no use of
- these helpers, then you can turn this option off. However,
- when such an binary or library is run, it will receive a SIGILL
- signal, which will terminate the program.
+ these helpers, then you can turn this option off to hinder
+ such exploits. However, in that case, if a binary or library
+ relying on those helpers is run, it will receive a SIGILL signal,
+ which will terminate the program.
Say N here only if you are absolutely certain that you do not
need these helpers; otherwise, the safe option is to say Y.