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| author | Rusty Russell <rusty@rustcorp.com.au> | 2013-05-08 04:36:55 +0400 |
|---|---|---|
| committer | Rusty Russell <rusty@rustcorp.com.au> | 2013-05-08 05:19:18 +0400 |
| commit | f616fe4feee4000c2995d2d1e1981513bf9ab0d4 (patch) | |
| tree | 9c6a8e1073cd948621c4c15875f740a33c500877 | |
| parent | f558a845c3a043d032bb247cdbe50db9202476a1 (diff) | |
| download | linux-f616fe4feee4000c2995d2d1e1981513bf9ab0d4.tar.xz | |
lguest: clear cached last cpu when guest_set_pgd() called.
commit v3.9-rc1-53-g6d0cda9 "lguest: cache last cpu we ran on." missed
one case, which causes a triple fault. The guest calls guest_set_pgd()
on the top page, and we carefully remap the Switcher text page. But
we didn't reset last_host_cpu, so map_switcher_in_guest() thinks
the guest's regs and IDT/GDT etc are already mapped.
Reported-by: Paul Bolle <pebolle@tiscali.nl>
Tested-by: Paul Bolle <pebolle@tiscali.nl>
Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
| -rw-r--r-- | drivers/lguest/page_tables.c | 1 |
1 files changed, 1 insertions, 0 deletions
diff --git a/drivers/lguest/page_tables.c b/drivers/lguest/page_tables.c index 699187ab3800..5b9ac32801c7 100644 --- a/drivers/lguest/page_tables.c +++ b/drivers/lguest/page_tables.c @@ -1002,6 +1002,7 @@ void guest_set_pgd(struct lguest *lg, unsigned long gpgdir, u32 idx) kill_guest(&lg->cpus[0], "Cannot populate switcher mapping"); } + lg->pgdirs[pgdir].last_host_cpu = -1; } } |