diff options
| author | Dan Williams <[email protected]> | 2016-12-06 17:03:35 -0800 |
|---|---|---|
| committer | Dan Williams <[email protected]> | 2016-12-06 17:42:37 -0800 |
| commit | 325896ffdf90f7cbd59fb873b7ba20d60d1ddf3c (patch) | |
| tree | d71d337b3a5b9858907c6a4a0797ced074302590 /drivers/rtc/rtc-dm355evm.c | |
| parent | a7de92dac9f0dbf01deb56fe1d661d7baac097e1 (diff) | |
device-dax: fix private mapping restriction, permit read-only
Hugh notes in response to commit 4cb19355ea19 "device-dax: fail all
private mapping attempts":
"I think that is more restrictive than you intended: haven't tried, but I
believe it rejects a PROT_READ, MAP_SHARED, O_RDONLY fd mmap, leaving no
way to mmap /dev/dax without write permission to it."
Indeed it does restrict read-only mappings, switch to checking
VM_MAYSHARE, not VM_SHARED.
Cc: <[email protected]>
Cc: Dave Hansen <[email protected]>
Cc: Pawel Lebioda <[email protected]>
Fixes: 4cb19355ea19 ("device-dax: fail all private mapping attempts")
Reported-by: Hugh Dickins <[email protected]>
Signed-off-by: Dan Williams <[email protected]>
Diffstat (limited to 'drivers/rtc/rtc-dm355evm.c')
0 files changed, 0 insertions, 0 deletions