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Michael Hennerich 4016a1390d mm/nommu.c: return 0 from kobjsize with invalid objects ... Don't perform kobjsize operations on objects the kernel doesn't manage. On Blackfin, drivers can get dma coherent memory by calling a function dma_alloc_coherent(). We do this in nommu by configuring a chunk of uncached memory at the top of memory. Since we don't want the kernel to use the uncached memory, we lie to the kernel, and tell it that it's max memory is between 0, and the start of the uncached dma coherent section. this all works well, until this memory gets exposed into userspace (with a frame buffer), when you look at the process's maps, it shows the framebuf: root:/proc> cat maps [snip] 03f0ef00-03f34700 rw-p 00000000 1f:00 192 /dev/fb0 root:/proc> This is outside the "normal" range for the kernel. When the kernel tries to find the size of this object (when you run ps), it dies in nommu.c in kobjsize. BUG_ON(page->index >= MAX_ORDER); since the page we are referring to is outside what the kernel thinks is it's max valid memory. root:~> while [ 1 ]; ps > /dev/null; done kernel BUG at mm/nommu.c:119! Kernel panic - not syncing: BUG! We fixed this by adding a check to reject out of range object pointers as it already does that for NULL pointers. Signed-off-by: Michael Hennerich <Michael.Hennerich@analog.com> Signed-off-by: Robin Getz <rgetz@blackfin.uclinux.org> Acked-by: David Howells <dhowells@redhat.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>		17 years ago
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Kconfig	…
Makefile	…
allocpercpu.c	…
backing-dev.c	…
bootmem.c	memory hotplug: make alloc_bootmem_section()	17 years ago
bounce.c	…
dmapool.c	…
fadvise.c	xip: support non-struct page backed memory	17 years ago
filemap.c	…
filemap_xip.c	xip: support non-struct page backed memory	17 years ago
fremap.c	…
highmem.c	…
hugetlb.c	hugetlbfs: common code update for s390	17 years ago
internal.h	memory hotplug: free memmaps allocated by bootmem	17 years ago
maccess.c	…
madvise.c	xip: support non-struct page backed memory	17 years ago
memcontrol.c	…
memory.c	…
memory_hotplug.c	memory hotplug: free memmaps allocated by bootmem	17 years ago
mempolicy.c	mempolicy: use struct mempolicy pointer in shmem_sb_info	17 years ago
mempool.c	…
migrate.c	…
mincore.c	…
mlock.c	…
mmap.c	mempolicy: rename mpol_copy to mpol_dup	17 years ago
mmzone.c	…
mprotect.c	…
mremap.c	…
msync.c	…
nommu.c	mm/nommu.c: return 0 from kobjsize with invalid objects	17 years ago
oom_kill.c	oom_kill: remove unused parameter in badness()	17 years ago
page-writeback.c	…
page_alloc.c	mm/page_alloc.c: remove hand-coded get_order()	17 years ago
page_io.c	…
page_isolation.c	…
pagewalk.c	…
pdflush.c	…
prio_tree.c	…
quicklist.c	…
readahead.c	…
rmap.c	…
shmem.c	mempolicy: use struct mempolicy pointer in shmem_sb_info	17 years ago
shmem_acl.c	…
slab.c	…
slob.c	…
slub.c	…
sparse-vmemmap.c	…
sparse.c	memory hotplug: free memmaps allocated by bootmem	17 years ago
swap.c	…
swap_state.c	…
swapfile.c	…
thrash.c	…
tiny-shmem.c	…
truncate.c	…
util.c	…
vmalloc.c	…
vmscan.c	…
vmstat.c	vmstats: add cond_resched() to refresh_cpu_vm_stats()	17 years ago