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authorHelge Deller <deller@gmx.de>2010-02-01 19:56:33 +0000
committerKyle McMartin <kyle@redhat.com>2010-03-06 22:54:09 +0000
commit888c31fc83ddc7fcd9947cb67c5718b4e3dd5e1b (patch)
tree15ef949561b6c8b319bb686eadec20c98148dfa3 /arch/parisc/Kconfig.debug
parentparisc: remove trailing space in messages (diff)
downloadlinux-dev-888c31fc83ddc7fcd9947cb67c5718b4e3dd5e1b.tar.xz
linux-dev-888c31fc83ddc7fcd9947cb67c5718b4e3dd5e1b.zip
parisc: add strict copy size checks (v2)
Add CONFIG_DEBUG_STRICT_USER_COPY_CHECKS, copied from the x86 implementation. Tested with 32 and 64bit kernel. Signed-off-by: Helge Deller <deller@gmx.de> Signed-off-by: Kyle McMartin <kyle@mcmartin.ca>
Diffstat (limited to '')
-rw-r--r--arch/parisc/Kconfig.debug14
1 files changed, 14 insertions, 0 deletions
diff --git a/arch/parisc/Kconfig.debug b/arch/parisc/Kconfig.debug
index bc989e522a04..7305ac8f7f5b 100644
--- a/arch/parisc/Kconfig.debug
+++ b/arch/parisc/Kconfig.debug
@@ -12,4 +12,18 @@ config DEBUG_RODATA
portion of the kernel code won't be covered by a TLB anymore.
If in doubt, say "N".
+config DEBUG_STRICT_USER_COPY_CHECKS
+ bool "Strict copy size checks"
+ depends on DEBUG_KERNEL && !TRACE_BRANCH_PROFILING
+ ---help---
+ Enabling this option turns a certain set of sanity checks for user
+ copy operations into compile time failures.
+
+ The copy_from_user() etc checks are there to help test if there
+ are sufficient security checks on the length argument of
+ the copy operation, by having gcc prove that the argument is
+ within bounds.
+
+ If unsure, or if you run an older (pre 4.4) gcc, say N.
+
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