| commit | 0b79eac6423ec1e204856a6d29ce600422106cd6 | |
| author | Ben Gras <ben@minix3.org> | |
| Mon, 17 Mar 2014 14:53:28 +0000 (17 15:53 +0100) | ||
| committer | Lionel Sambuc <lionel@minix3.org> | |
| Mon, 28 Jul 2014 15:05:20 +0000 (28 17:05 +0200) | ||
| tree | b86908b3f20cb9414f21d19bfe3a9aaa166bb82d | treesnapshot (tar.gz zip) |
| parent | 29dca953867b73cb735105262b1df6d5c434c19e | commitdiff |
mmap: accept non-PROT_WRITE MAP_SHARED mappings
Currently we don't accept writable file mmap()s, as there is no
system in place to guarantee dirty buffers would make it back to
disk. But we can actually accept MAP_SHARED for PROT_READ mappings,
meaning the ranges aren't writable at all (and no private copy is
made as with MAP_PRIVATE), as it turns out a fairly large class of
usage.
. fail writable MAP_SHARED mappings at runtime
. reduces some minix-specific patches
. lets binutils gold build on minix without further patching
Change-Id: If2896c0a555328ac5b324afa706063fc6d86519e
Currently we don't accept writable file mmap()s, as there is no
system in place to guarantee dirty buffers would make it back to
disk. But we can actually accept MAP_SHARED for PROT_READ mappings,
meaning the ranges aren't writable at all (and no private copy is
made as with MAP_PRIVATE), as it turns out a fairly large class of
usage.
. fail writable MAP_SHARED mappings at runtime
. reduces some minix-specific patches
. lets binutils gold build on minix without further patching
Change-Id: If2896c0a555328ac5b324afa706063fc6d86519e