diff options
| author | Ian Moffett <ian@osmora.org> | 2024-05-01 21:53:49 -0400 |
|---|---|---|
| committer | Ian Moffett <ian@osmora.org> | 2024-05-01 21:57:47 -0400 |
| commit | c282dc146525a911044fea6cd5d851a742e9b342 (patch) | |
| tree | f6c77748f42e739d10bfe9c54751cbad9bed14a5 | |
| parent | 3baafe30aa682b40a49c38b6b97fc077dd0033a3 (diff) | |
kernel: vm_map: Ensure mmap len is always aligned
Physical memory pages to be allocated is 'len / GRANULE'. Previously, if
'len' was less than the machine page-size, the amount of pages to allocate
would be 0 causing the map to fail.
Signed-off-by: Ian Moffett <ian@osmora.org>
| -rw-r--r-- | sys/vm/vm_map.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/sys/vm/vm_map.c b/sys/vm/vm_map.c index 4f7aadc..9e40e95 100644 --- a/sys/vm/vm_map.c +++ b/sys/vm/vm_map.c @@ -358,6 +358,9 @@ mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off) mapping->prot = prot | PROT_USER; map_start = __ALIGN_DOWN(va, GRANULE); + /* Ensure the length is aligned */ + len = __ALIGN_UP(len + misalign, GRANULE); + /* * Now we check what type of map request * this is. @@ -409,7 +412,7 @@ mmap(void *addr, size_t len, int prot, int flags, int fildes, off_t off) } /* Setup map_end and map ranges */ - map_end = map_start + __ALIGN_UP(len + misalign, GRANULE); + map_end = map_start + len; mapping->range.start = map_start; mapping->range.end = map_end; mapping->physmem_base = physmem; |