diff options
| author | cinap_lenrek <cinap_lenrek@felloff.net> | 2014-05-24 01:27:57 +0200 |
|---|---|---|
| committer | cinap_lenrek <cinap_lenrek@felloff.net> | 2014-05-24 01:27:57 +0200 |
| commit | 2185188f8360ea1952c7339c2702a16f15b12be1 (patch) | |
| tree | ccd6af4653f031805276eb91488d8cfafdef7986 | |
| parent | eef4565003def0a1e72bf381665027ebe0420c6f (diff) | |
kernel: fix read size calculation in pio() demand load
on amd64, the text segment is aligned and padded to
2MB, but segment granularity is 4K which can give
us page faults that are beyond the highest file
offset. this is perfectly valid, but was not handled
correctly in pio().
| -rw-r--r-- | sys/src/9/port/fault.c | 8 |
1 files changed, 5 insertions, 3 deletions
diff --git a/sys/src/9/port/fault.c b/sys/src/9/port/fault.c index 1919c2890..3d4530401 100644 --- a/sys/src/9/port/fault.c +++ b/sys/src/9/port/fault.c @@ -211,9 +211,11 @@ retry: } c = s->image->c; - ask = s->flen-soff; - if(ask > BY2PG) - ask = BY2PG; + ask = BY2PG; + if(soff >= s->flen) + ask = 0; + else if((soff+ask) > s->flen) + ask = s->flen-soff; } else { /* from a swap image */ daddr = swapaddr(loadrec); |