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statx: Reserve the top bit of the mask for future struct expansion

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Reserve the top bit of the mask for future expansion of the statx struct
and give an error if statx() sees it set.  All the other bits are ignored
if we see them set but don't support the bit; we just clear the bit in the
returned mask.

Signed-off-by: David Howells <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
David Howells 2017-03-31 18:32:10 +01:00 • committed by Al Viro
commit 47071aee6a
2 changed files with 3 additions and 0 deletions
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2
fs/stat.c
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@ -562,6 +562,8 @@ SYSCALL_DEFINE5(statx,
struct kstat stat;
int error;
if (mask & STATX__RESERVED)
return -EINVAL;
if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE)
return -EINVAL;