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authorClemens Ladisch <clemens@ladisch.de>2011-06-21 16:09:50 -0400
committerLinus Torvalds <torvalds@linux-foundation.org>2011-08-14 15:32:52 -0400
commitf982f91516fa4cfd9d20518833cd04ad714585be (patch)
tree15c7992ad6e54fbda868a026afd5ecf98f9b1bca /mm
parent97c24d1d455df17ca3ef281d1a290988f4686643 (diff)
mm: fix wrong vmap address calculations with odd NR_CPUS values
Commit db64fe02258f ("mm: rewrite vmap layer") introduced code that does address calculations under the assumption that VMAP_BLOCK_SIZE is a power of two. However, this might not be true if CONFIG_NR_CPUS is not set to a power of two. Wrong vmap_block index/offset values could lead to memory corruption. However, this has never been observed in practice (or never been diagnosed correctly); what caught this was the BUG_ON in vb_alloc() that checks for inconsistent vmap_block indices. To fix this, ensure that VMAP_BLOCK_SIZE always is a power of two. BugLink: https://bugzilla.kernel.org/show_bug.cgi?id=31572 Reported-by: Pavel Kysilka <goldenfish@linuxsoft.cz> Reported-by: Matias A. Fonzo <selk@dragora.org> Signed-off-by: Clemens Ladisch <clemens@ladisch.de> Signed-off-by: Stefan Richter <stefanr@s5r6.in-berlin.de> Cc: Nick Piggin <npiggin@suse.de> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Cc: Krzysztof Helt <krzysztof.h1@poczta.fm> Cc: Andrew Morton <akpm@linux-foundation.org> Cc: 2.6.28+ <stable@kernel.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm')
-rw-r--r--mm/vmalloc.c7
1 files changed, 4 insertions, 3 deletions
diff --git a/mm/vmalloc.c b/mm/vmalloc.c
index 464621d18eb2..7ef0903058ee 100644
--- a/mm/vmalloc.c
+++ b/mm/vmalloc.c
@@ -725,9 +725,10 @@ static void free_unmap_vmap_area_addr(unsigned long addr)
725#define VMAP_BBMAP_BITS_MIN (VMAP_MAX_ALLOC*2) 725#define VMAP_BBMAP_BITS_MIN (VMAP_MAX_ALLOC*2)
726#define VMAP_MIN(x, y) ((x) < (y) ? (x) : (y)) /* can't use min() */ 726#define VMAP_MIN(x, y) ((x) < (y) ? (x) : (y)) /* can't use min() */
727#define VMAP_MAX(x, y) ((x) > (y) ? (x) : (y)) /* can't use max() */ 727#define VMAP_MAX(x, y) ((x) > (y) ? (x) : (y)) /* can't use max() */
728#define VMAP_BBMAP_BITS VMAP_MIN(VMAP_BBMAP_BITS_MAX, \ 728#define VMAP_BBMAP_BITS \
729 VMAP_MAX(VMAP_BBMAP_BITS_MIN, \ 729 VMAP_MIN(VMAP_BBMAP_BITS_MAX, \
730 VMALLOC_PAGES / NR_CPUS / 16)) 730 VMAP_MAX(VMAP_BBMAP_BITS_MIN, \
731 VMALLOC_PAGES / roundup_pow_of_two(NR_CPUS) / 16))
731 732
732#define VMAP_BLOCK_SIZE (VMAP_BBMAP_BITS * PAGE_SIZE) 733#define VMAP_BLOCK_SIZE (VMAP_BBMAP_BITS * PAGE_SIZE)
733 734