kernel.git/drivers/lguest/core.c, branch linux-3.18.y

lguest: fix out-by-one error in address checking.

2015-06-09T17:43:52Z

[ Upstream commit 83a35114d0e4583e6b0ca39502e68b6a92e2910c ] This bug has been there since day 1; addresses in the top guest physical page weren't considered valid. You could map that page (the check in check_gpte() is correct), but if a guest tried to put a pagetable there we'd check that address manually when walking it, and kill the guest. Signed-off-by: Rusty Russell Cc: stable@kernel.org Signed-off-by: Linus Torvalds Signed-off-by: Sasha Levin

mm/vmalloc.c: clean up map_vm_area third argument

2014-08-07T01:01:19Z

Currently map_vm_area() takes (struct page *** pages) as third argument, and after mapping, it moves (*pages) to point to (*pages + nr_mappped_pages). It looks like this kind of increment is useless to its caller these days. The callers don't care about the increments and actually they're trying to avoid this by passing another copy to map_vm_area(). The caller can always guarantee all the pages can be mapped into vm_area as specified in first argument and the caller only cares about whether map_vm_area() fails or not. This patch cleans up the pointer movement in map_vm_area() and updates its callers accordingly. Signed-off-by: WANG Chao Cc: Zhang Yanfei Acked-by: Greg Kroah-Hartman Cc: Minchan Kim Cc: Nitin Gupta Cc: Rusty Russell Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds

lguest: map Switcher below fixmap.

2013-04-22T06:15:03Z

Now we've adjusted all the code, we can simply set switcher_addr to wherever it needs to go below the fixmaps, rather than asserting that it should be so. With large NR_CPUS and PAE, people were hitting the "mapping switcher would thwack fixmap" message. Reported-by: Paul Bolle Signed-off-by: Rusty Russell

lguest: don't share Switcher PTE pages between guests.

2013-04-22T06:15:01Z

We currently use the whole top PGD entry for the switcher, so we simply share a fixed page of PTEs between all guests (actually, it's one per Host CPU, to ensure isolation between guests). Changes to a scheme where every guest has its own mappings. Signed-off-by: Rusty Russell

lguest: expost switcher_pages array (as lg_switcher_pages).

2013-04-22T06:15:00Z

We will need this in page_table.c soon. Signed-off-by: Rusty Russell

lguest: assume Switcher text is a single page.

2013-04-22T06:01:36Z

ie. SHARED_SWITCHER_PAGES == 1. It is well under a page, and it's a minor simplification: it's nice to have *one* simplification in a patch series! Signed-off-by: Rusty Russell

lguest: rename switcher_page to switcher_pages.

2013-04-22T06:01:35Z

There is a single page with the Switcher in it, but it's followed by 2 pages per Host CPU. Signed-off-by: Rusty Russell

lguest: prepare to make SWITCHER_ADDR a variable.

2013-04-22T06:01:33Z

We currently use the whole top PGD entry for the switcher, but that's hitting the fixmap in some configurations (mainly, large NR_CPUS). Introduce a variable, currently set to the constant. Signed-off-by: Rusty Russell

lguest: fix typo

2012-12-18T04:49:06Z

Signed-off-by: Alex Russell Signed-off-by: Rusty Russell

lguest: move process freezing before pending signals check

2011-10-27T00:26:18Z

run_guest tries to freeze the current process after it has handled pending interrupts and before it calls lguest_arch_run_guest. This doesn't work nicely if the task has been killed while being frozen and when we want to handle that signal as soon as possible. Let's move try_to_freeze before we check for pending signal so that we can get out of the loop as soon as possible. Signed-off-by: Michal Hocko Acked-by: Rusty Russell Signed-off-by: Rusty Russell