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| author | Khalid Aziz <khalid.aziz@oracle.com> | 2018-02-21 10:15:49 -0700 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2018-03-18 07:38:47 -0700 |
| commit | 9035cf9a97e429e6b5291841da81c433879f5658 (patch) | |
| tree | d18593bc9412efa453a2b1e24ff860bfcb70ea9f /mm/mprotect.c | |
| parent | c6202ca764ac7b3728e29bca616567beb57fbac7 (diff) | |
| download | lwn-9035cf9a97e429e6b5291841da81c433879f5658.tar.gz lwn-9035cf9a97e429e6b5291841da81c433879f5658.zip | |
mm: Add address parameter to arch_validate_prot()
A protection flag may not be valid across entire address space and
hence arch_validate_prot() might need the address a protection bit is
being set on to ensure it is a valid protection flag. For example, sparc
processors support memory corruption detection (as part of ADI feature)
flag on memory addresses mapped on to physical RAM but not on PFN mapped
pages or addresses mapped on to devices. This patch adds address to the
parameters being passed to arch_validate_prot() so protection bits can
be validated in the relevant context.
Signed-off-by: Khalid Aziz <khalid.aziz@oracle.com>
Cc: Khalid Aziz <khalid@gonehiking.org>
Reviewed-by: Anthony Yznaga <anthony.yznaga@oracle.com>
Acked-by: Michael Ellerman <mpe@ellerman.id.au> (powerpc)
Acked-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'mm/mprotect.c')
| -rw-r--r-- | mm/mprotect.c | 2 |
1 files changed, 1 insertions, 1 deletions
diff --git a/mm/mprotect.c b/mm/mprotect.c index e3309fcf586b..088ea9c08678 100644 --- a/mm/mprotect.c +++ b/mm/mprotect.c @@ -417,7 +417,7 @@ static int do_mprotect_pkey(unsigned long start, size_t len, end = start + len; if (end <= start) return -ENOMEM; - if (!arch_validate_prot(prot)) + if (!arch_validate_prot(prot, start)) return -EINVAL; reqprot = prot; |