To further harden barebox against attackers, add options to zero
registers on function exit, buffers on malloc and after free as well as
local variables.
Additionally, TLSF already has sanity checks, which are promoted to
panics with CONFIG_BUG_ON_DATA_CORRUPTION enabled.
v1 -> v2:
- change config option help text for malloc buffer zeroing
to be more appropriate for barebox instead of Linux (Sascha)
Ahmad Fatoum (5):
dlmalloc: add aliases with dl as prefix
hardening: support zeroing all malloc buffers by default
hardening: support initializing stack variables by default
hardening: support register zeroing on function exit
tlsf: panic in asserts if CONFIG_BUG_ON_DATA_CORRUPTION=y
Makefile | 17 ++++++
common/calloc.c | 7 ++-
common/dlmalloc.c | 73 ++++++++++++++-----------
common/tlsf.c | 6 +++
include/dlmalloc.h | 15 ++++++
include/malloc.h | 10 ++++
include/tlsf.h | 2 +
lib/Kconfig.hardening | 121 ++++++++++++++++++++++++++++++++++++++++++
8 files changed, 215 insertions(+), 36 deletions(-)
create mode 100644 include/dlmalloc.h
--
2.39.5
