IB/mlx5: Allow mapping the free running counter on PROT_EXEC
The current mlx5 code disallows mapping the free running counter of
mlx5 based hardwares when PROT_EXEC is set.
Although this behaviour is correct, Linux does add an implicit VM_EXEC
to the vm_flags if the READ_IMPLIES_EXEC bit is set in the process
personality. This happens for example if the process stack is
executable.
This causes libmlx5 to output a warning and prevents the user from
reading the free running clock.
Executing the init segment of the hardware isn't a security risk
(at least no more than executing a process own stack), so we just
prevent writes to there.
Fixes: d69e3bcf7976 ('IB/mlx5: Mmap the HCA's core clock register to
user-space')
Signed-off-by: Matan Barak <matanb@mellanox.com>
Reviewed-by: Haggai Eran <haggaie@mellanox.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
diff --git a/drivers/infiniband/hw/mlx5/main.c b/drivers/infiniband/hw/mlx5/main.c
index 6ad0489..f2a1ad9 100644
--- a/drivers/infiniband/hw/mlx5/main.c
+++ b/drivers/infiniband/hw/mlx5/main.c
@@ -1108,7 +1108,7 @@
if (vma->vm_end - vma->vm_start != PAGE_SIZE)
return -EINVAL;
- if (vma->vm_flags & (VM_WRITE | VM_EXEC))
+ if (vma->vm_flags & VM_WRITE)
return -EPERM;
/* Don't expose to user-space information it shouldn't have */