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| author | kib <kib@FreeBSD.org> | 2016-05-27 18:45:11 +0000 |
|---|---|---|
| committer | kib <kib@FreeBSD.org> | 2016-05-27 18:45:11 +0000 |
| commit | b049cb19c0e2192f68bd1903ff4d517a02eea556 (patch) | |
| tree | e1183babf4087a05e1660259647a6e11a530ca97 /sys/amd64 | |
| parent | 8bea5267cd2d0c7a1e5509f3e61b0a91e08fc9d0 (diff) | |
| download | FreeBSD-src-b049cb19c0e2192f68bd1903ff4d517a02eea556.zip FreeBSD-src-b049cb19c0e2192f68bd1903ff4d517a02eea556.tar.gz | |
In pmap_advise(), avoid leaking DI start for EPT pmaps which needs A/D
emulation. Assert that syscalls do not leak DI.
Reported by: gjb
Sponsored by: The FreeBSD Foundation
Diffstat (limited to 'sys/amd64')
| -rw-r--r-- | sys/amd64/amd64/pmap.c | 2 | ||||
| -rw-r--r-- | sys/amd64/amd64/trap.c | 4 |
2 files changed, 5 insertions, 1 deletions
diff --git a/sys/amd64/amd64/pmap.c b/sys/amd64/amd64/pmap.c index cc76974..7a93e76 100644 --- a/sys/amd64/amd64/pmap.c +++ b/sys/amd64/amd64/pmap.c @@ -6060,7 +6060,6 @@ pmap_advise(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, int advice) if (advice != MADV_DONTNEED && advice != MADV_FREE) return; - pmap_delayed_invl_started(); /* * A/D bit emulation requires an alternate code path when clearing @@ -6077,6 +6076,7 @@ pmap_advise(pmap_t pmap, vm_offset_t sva, vm_offset_t eva, int advice) PG_V = pmap_valid_bit(pmap); PG_RW = pmap_rw_bit(pmap); anychanged = FALSE; + pmap_delayed_invl_started(); PMAP_LOCK(pmap); for (; sva < eva; sva = va_next) { pml4e = pmap_pml4e(pmap, sva); diff --git a/sys/amd64/amd64/trap.c b/sys/amd64/amd64/trap.c index 620a461..1b85b32 100644 --- a/sys/amd64/amd64/trap.c +++ b/sys/amd64/amd64/trap.c @@ -959,6 +959,10 @@ amd64_syscall(struct thread *td, int traced) KASSERT(td->td_pcb->pcb_save == get_pcb_user_save_td(td), ("System call %s returning with mangled pcb_save", syscallname(td->td_proc, sa.code))); + KASSERT(td->td_md.md_invl_gen.gen == 0, + ("System call %s returning with leaked invl_gen %lu", + syscallname(td->td_proc, sa.code), td->td_md.md_invl_gen.gen)); + syscallret(td, error, &sa); |
