diff options
| author | Khalid Aziz <khalid.aziz@oracle.com> | 2018-02-23 15:46:41 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-03-18 07:38:48 -0700 |
| commit | 74a04967482faa7144b93dae3b2e913870dd421c (patch) | |
| tree | 387f2497cfd053d99504a00ff8ccce0dd5fbd647 /include/linux/mm.h | |
| parent | a4602b62d9fdea41412ba765bbf32ecfc2b6a94c (diff) | |
sparc64: Add support for ADI (Application Data Integrity)
ADI is a new feature supported on SPARC M7 and newer processors to allow
hardware to catch rogue accesses to memory. ADI is supported for data
fetches only and not instruction fetches. An app can enable ADI on its
data pages, set version tags on them and use versioned addresses to
access the data pages. Upper bits of the address contain the version
tag. On M7 processors, upper four bits (bits 63-60) contain the version
tag. If a rogue app attempts to access ADI enabled data pages, its
access is blocked and processor generates an exception. Please see
Documentation/sparc/adi.txt for further details.
This patch extends mprotect to enable ADI (TSTATE.mcde), enable/disable
MCD (Memory Corruption Detection) on selected memory ranges, enable
TTE.mcd in PTEs, return ADI parameters to userspace and save/restore ADI
version tags on page swap out/in or migration. ADI is not enabled by
default for any task. A task must explicitly enable ADI on a memory
range and set version tag for ADI to be effective for the task.
Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com>
Cc: Khalid Aziz <khalid@gonehiking.org>
Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'include/linux/mm.h')
| -rw-r--r-- | include/linux/mm.h | 3 |
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/mm.h b/include/linux/mm.h index ae806dbc63ee..32fe6919a11b 100644 --- a/include/linux/mm.h +++ b/include/linux/mm.h @@ -245,6 +245,9 @@ extern unsigned int kobjsize(const void *objp); # define VM_GROWSUP VM_ARCH_1 #elif defined(CONFIG_IA64) # define VM_GROWSUP VM_ARCH_1 +#elif defined(CONFIG_SPARC64) +# define VM_SPARC_ADI VM_ARCH_1 /* Uses ADI tag for access control */ +# define VM_ARCH_CLEAR VM_SPARC_ADI #elif !defined(CONFIG_MMU) # define VM_MAPPED_COPY VM_ARCH_1 /* T if mapped copy of data (nommu mmap) */ #endif |