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arm: Implement thread_struct whitelist for hardened usercopy

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While ARM32 carries FPU state in the thread structure that is saved and
restored during signal handling, it doesn't need to declare a usercopy
whitelist, since existing accessors are all either using a bounce buffer
(for which whitelisting isn't checking the slab), are statically sized
(which will bypass the hardened usercopy check), or both.

Cc: Russell King <[email protected]>
Cc: Ingo Molnar <[email protected]>
Cc: Christian Borntraeger <[email protected]>
Cc: "Peter Zijlstra (Intel)" <[email protected]>
Cc: [email protected]
Signed-off-by: Kees Cook <[email protected]>
This commit is contained in:
Kees Cook 2017-08-16 14:09:13 -07:00
commit 08626a6056
2 changed files with 11 additions and 0 deletions
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1
arch/arm/Kconfig
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@ -50,6 +50,7 @@ config ARM
select HAVE_ARCH_KGDB if !CPU_ENDIAN_BE32 && MMU
select HAVE_ARCH_MMAP_RND_BITS if MMU
select HAVE_ARCH_SECCOMP_FILTER if (AEABI && !OABI_COMPAT)
select HAVE_ARCH_THREAD_STRUCT_WHITELIST
select HAVE_ARCH_TRACEHOOK
select HAVE_ARM_SMCCC if CPU_V7
select HAVE_EBPF_JIT if !CPU_ENDIAN_BE32

10
arch/arm/include/asm/processor.h
View file

@ -45,6 +45,16 @@ struct thread_struct {
struct debug_info debug;
};
/*
* Everything usercopied to/from thread_struct is statically-sized, so
* no hardened usercopy whitelist is needed.
*/
static inline void arch_thread_struct_whitelist(unsigned long *offset,
unsigned long *size)
{
*offset = *size = 0;
}
#define INIT_THREAD { }
#define start_thread(regs,pc,sp) \