Within the futex module, there are some cases in which a raw pointer is handled. When working with PCuABI this means that the capability is discarded, and no checks can be performed by the hardware.
This commit adds TODOs whenever explicit capability checks need to be performed, right before the raw pointer is extracted.
Signed-off-by: Luca Vizzarro Luca.Vizzarro@arm.com --- kernel/futex/core.c | 4 ++++ 1 file changed, 4 insertions(+)
diff --git a/kernel/futex/core.c b/kernel/futex/core.c index 689b8be704ae..dd864c0a2e03 100644 --- a/kernel/futex/core.c +++ b/kernel/futex/core.c @@ -227,6 +227,8 @@ int get_futex_key(u32 __user *uaddr, bool fshared, union futex_key *key, struct address_space *mapping; int err, ro = 0;
+ /* TODO [PCuABI] - capability checks for uaccess */ + /* * The futex address must be "naturally" aligned. */ @@ -412,6 +414,8 @@ int fault_in_user_writeable(u32 __user *uaddr) struct mm_struct *mm = current->mm; int ret;
+ /* TODO [PCuABI] - capability checks for uaccess */ + mmap_read_lock(mm); ret = fixup_user_fault(mm, user_ptr_addr(uaddr), FAULT_FLAG_WRITE, NULL);