f44ec6f3f8
This attempts to address CVE-2006-6058 http://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2006-6058 first reported at http://projects.info-pull.com/mokb/MOKB-17-11-2006.html Essentially a corrupted minix dir inode reporting a very large i_size will loop for a very long time in minix_readdir, minix_find_entry, etc, because on EIO they just move on to try the next page. This is under the BKL, printk-storming as well. This can lock up the machine for a very long time. Simply ratelimiting the printks gets things back under control. Make the message a bit more informative while we're here. Signed-off-by: Eric Sandeen <sandeen@redhat.com> Cc: Bodo Eggert <7eggert@gmx.de> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
73 lines
1.6 KiB
C
73 lines
1.6 KiB
C
#include <linux/buffer_head.h>
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#include "minix.h"
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enum {DIRECT = 7, DEPTH = 4}; /* Have triple indirect */
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typedef u32 block_t; /* 32 bit, host order */
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static inline unsigned long block_to_cpu(block_t n)
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{
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return n;
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}
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static inline block_t cpu_to_block(unsigned long n)
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{
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return n;
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}
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static inline block_t *i_data(struct inode *inode)
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{
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return (block_t *)minix_i(inode)->u.i2_data;
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}
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static int block_to_path(struct inode * inode, long block, int offsets[DEPTH])
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{
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int n = 0;
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char b[BDEVNAME_SIZE];
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struct super_block *sb = inode->i_sb;
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if (block < 0) {
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printk("MINIX-fs: block_to_path: block %ld < 0 on dev %s\n",
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block, bdevname(sb->s_bdev, b));
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} else if (block >= (minix_sb(inode->i_sb)->s_max_size/sb->s_blocksize)) {
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if (printk_ratelimit())
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printk("MINIX-fs: block_to_path: "
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"block %ld too big on dev %s\n",
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block, bdevname(sb->s_bdev, b));
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} else if (block < 7) {
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offsets[n++] = block;
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} else if ((block -= 7) < 256) {
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offsets[n++] = 7;
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offsets[n++] = block;
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} else if ((block -= 256) < 256*256) {
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offsets[n++] = 8;
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offsets[n++] = block>>8;
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offsets[n++] = block & 255;
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} else {
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block -= 256*256;
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offsets[n++] = 9;
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offsets[n++] = block>>16;
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offsets[n++] = (block>>8) & 255;
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offsets[n++] = block & 255;
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}
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return n;
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}
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#include "itree_common.c"
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int V2_minix_get_block(struct inode * inode, long block,
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struct buffer_head *bh_result, int create)
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{
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return get_block(inode, block, bh_result, create);
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}
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void V2_minix_truncate(struct inode * inode)
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{
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truncate(inode);
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}
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unsigned V2_minix_blocks(loff_t size, struct super_block *sb)
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{
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return nblocks(size, sb);
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}
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