From cf1857234d83095c437e2cc8346e5a2783667cf1 Mon Sep 17 00:00:00 2001 From: David Howells Date: Wed, 4 Nov 2015 15:20:42 +0000 Subject: FS-Cache: Handle a write to the page immediately beyond the EOF marker commit 102f4d900c9c8f5ed89ae4746d493fe3ebd7ba64 upstream. Handle a write being requested to the page immediately beyond the EOF marker on a cache object. Currently this gets an assertion failure in CacheFiles because the EOF marker is used there to encode information about a partial page at the EOF - which could lead to an unknown blank spot in the file if we extend the file over it. The problem is actually in fscache where we check the index of the page being written against store_limit. store_limit is set to the number of pages that we're allowed to store by fscache_set_store_limit() - which means it's one more than the index of the last page we're allowed to store. The problem is that we permit writing to a page with an index _equal_ to the store limit - when we should reject that case. Whilst we're at it, change the triggered assertion in CacheFiles to just return -ENOBUFS instead. The assertion failure looks something like this: CacheFiles: Assertion failed 1000 < 7b1 is false ------------[ cut here ]------------ kernel BUG at fs/cachefiles/rdwr.c:962! ... RIP: 0010:[] [] cachefiles_write_page+0x273/0x2d0 [cachefiles] Signed-off-by: David Howells Signed-off-by: Al Viro [bwh: Backported to 3.2: we don't have __kernel_write() so keep using the open-coded equivalent] Signed-off-by: Ben Hutchings --- fs/cachefiles/rdwr.c | 78 +++++++++++++++++++++++++++++----------------------- fs/fscache/page.c | 2 +- 2 files changed, 44 insertions(+), 36 deletions(-) diff --git a/fs/cachefiles/rdwr.c b/fs/cachefiles/rdwr.c index b4d2438da9a5..00d942540e6c 100644 --- a/fs/cachefiles/rdwr.c +++ b/fs/cachefiles/rdwr.c @@ -914,6 +914,15 @@ int cachefiles_write_page(struct fscache_storage *op, struct page *page) cache = container_of(object->fscache.cache, struct cachefiles_cache, cache); + pos = (loff_t)page->index << PAGE_SHIFT; + + /* We mustn't write more data than we have, so we have to beware of a + * partial page at EOF. + */ + eof = object->fscache.store_limit_l; + if (pos >= eof) + goto error; + /* write the page to the backing filesystem and let it store it in its * own time */ dget(object->backer); @@ -922,47 +931,46 @@ int cachefiles_write_page(struct fscache_storage *op, struct page *page) cache->cache_cred); if (IS_ERR(file)) { ret = PTR_ERR(file); - } else { + goto error_2; + } + if (!file->f_op->write) { ret = -EIO; - if (file->f_op->write) { - pos = (loff_t) page->index << PAGE_SHIFT; - - /* we mustn't write more data than we have, so we have - * to beware of a partial page at EOF */ - eof = object->fscache.store_limit_l; - len = PAGE_SIZE; - if (eof & ~PAGE_MASK) { - ASSERTCMP(pos, <, eof); - if (eof - pos < PAGE_SIZE) { - _debug("cut short %llx to %llx", - pos, eof); - len = eof - pos; - ASSERTCMP(pos + len, ==, eof); - } - } + goto error_2; + } - data = kmap(page); - old_fs = get_fs(); - set_fs(KERNEL_DS); - ret = file->f_op->write( - file, (const void __user *) data, len, &pos); - set_fs(old_fs); - kunmap(page); - if (ret != len) - ret = -EIO; + len = PAGE_SIZE; + if (eof & ~PAGE_MASK) { + if (eof - pos < PAGE_SIZE) { + _debug("cut short %llx to %llx", + pos, eof); + len = eof - pos; + ASSERTCMP(pos + len, ==, eof); } - fput(file); } - if (ret < 0) { - if (ret == -EIO) - cachefiles_io_error_obj( - object, "Write page to backing file failed"); - ret = -ENOBUFS; - } + data = kmap(page); + old_fs = get_fs(); + set_fs(KERNEL_DS); + ret = file->f_op->write( + file, (const void __user *) data, len, &pos); + set_fs(old_fs); + kunmap(page); + fput(file); + if (ret != len) + goto error_eio; + + _leave(" = 0"); + return 0; - _leave(" = %d", ret); - return ret; +error_eio: + ret = -EIO; +error_2: + if (ret == -EIO) + cachefiles_io_error_obj(object, + "Write page to backing file failed"); +error: + _leave(" = -ENOBUFS [%d]", ret); + return -ENOBUFS; } /* diff --git a/fs/fscache/page.c b/fs/fscache/page.c index 3f7a59bfa7ad..c9d52e1a8fa9 100644 --- a/fs/fscache/page.c +++ b/fs/fscache/page.c @@ -676,7 +676,7 @@ static void fscache_write_op(struct fscache_operation *_op) goto superseded; page = results[0]; _debug("gang %d [%lx]", n, page->index); - if (page->index > op->store_limit) { + if (page->index >= op->store_limit) { fscache_stat(&fscache_n_store_pages_over_limit); goto superseded; } -- cgit v1.2.3