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authorNed Ludd <solar@gentoo.org>2005-02-08 21:21:32 +0000
committerNed Ludd <solar@gentoo.org>2005-02-08 21:21:32 +0000
commitbec9bd410826a3fcec9c8907fa85cae62cc800f8 (patch)
treede03f420ae9a046d90cb556d92734dab13a0cb93
parent8be6b41965c8853b56a34130be17d582890816ee (diff)
- 3/NN patches for ssp. Doc updates from Peter S. Mazinger and Robert Connolly
-rw-r--r--extra/Configs/Config.in29
1 files changed, 17 insertions, 12 deletions
diff --git a/extra/Configs/Config.in b/extra/Configs/Config.in
index abc1856ad..c2e7a418c 100644
--- a/extra/Configs/Config.in
+++ b/extra/Configs/Config.in
@@ -1110,34 +1110,39 @@ config UCLIBC_BUILD_PIE
functions must be written as position independent code (PIC).
config UCLIBC_HAS_SSP
- bool "Support for propolice stack protection"
+ bool "Support for propolice smashing stack protector"
depends on UCLIBC_SECURITY
default n
help
- Adds propolice protection to libc (__guard and __stack_smash_handler).
- More about it on <http://www.research.ibm.com/trl/projects/security/ssp> .
- To be able to use it, you'll also need a propolice patched gcc,
- supporting the -fstack-protector[-all] options. It is a specially patched
- gcc version, where __guard and __stack_smash_handler are removed from libgcc.
+ Add propolice smashing stack protector to the library.
+ This requires a patched version of GCC, supporting the
+ -fstack-protector[-all] options, with the __guard and
+ __stack_smash_handler functions removed from libgcc.
+ These functions are added to libc instead.
+ More information at:
+ <http://www.research.ibm.com/trl/projects/security/ssp/>
Most people will answer N.
config SSP_QUICK_CANARY
- bool "Simple propolice canary w/o accessing /dev/*random"
+ bool "Use simple guard values without accessing /dev/urandom"
depends on UCLIBC_HAS_SSP
default n
help
- Propolice uses a simplified version of the canary, without accessing
- /dev/*random.
+ Use gettimeofday(2) to define the __guard without accessing
+ /dev/urandom.
+ WARNING: This makes smashing stack protector vulnerable to timing
+ attacks.
Most people will answer N.
config SSP_USE_ERANDOM
- bool "Propolice uses /dev/erandom as canary source"
+ bool "Use erandom for setting guard value if /dev/urandom fails"
depends on UCLIBC_HAS_SSP && !SSP_QUICK_CANARY
default n
help
- Propolice uses /dev/erandom as canary source.
+ Use /dev/erandom to define the guard if /dev/urandom fails (chroot).
This requires a modified kernel.
- For more info see http://frandom.sourceforge.net/.
+ More information at:
+ <http://frandom.sourceforge.net/>
Most people will answer N.
choice