From 798b7347e4f29553db4b996393caf12f5b233daf Mon Sep 17 00:00:00 2001 From: Zhe Li Date: Fri, 19 Jun 2020 17:06:35 +0800 Subject: jffs2: fix UAF problem The log of UAF problem is listed below. BUG: KASAN: use-after-free in jffs2_rmdir+0xa4/0x1cc [jffs2] at addr c1f165fc Read of size 4 by task rm/8283 ============================================================================= BUG kmalloc-32 (Tainted: P B O ): kasan: bad access detected ----------------------------------------------------------------------------- INFO: Allocated in 0xbbbbbbbb age=3054364 cpu=0 pid=0 0xb0bba6ef jffs2_write_dirent+0x11c/0x9c8 [jffs2] __slab_alloc.isra.21.constprop.25+0x2c/0x44 __kmalloc+0x1dc/0x370 jffs2_write_dirent+0x11c/0x9c8 [jffs2] jffs2_do_unlink+0x328/0x5fc [jffs2] jffs2_rmdir+0x110/0x1cc [jffs2] vfs_rmdir+0x180/0x268 do_rmdir+0x2cc/0x300 ret_from_syscall+0x0/0x3c INFO: Freed in 0x205b age=3054364 cpu=0 pid=0 0x2e9173 jffs2_add_fd_to_list+0x138/0x1dc [jffs2] jffs2_add_fd_to_list+0x138/0x1dc [jffs2] jffs2_garbage_collect_dirent.isra.3+0x21c/0x288 [jffs2] jffs2_garbage_collect_live+0x16bc/0x1800 [jffs2] jffs2_garbage_collect_pass+0x678/0x11d4 [jffs2] jffs2_garbage_collect_thread+0x1e8/0x3b0 [jffs2] kthread+0x1a8/0x1b0 ret_from_kernel_thread+0x5c/0x64 Call Trace: [c17ddd20] [c02452d4] kasan_report.part.0+0x298/0x72c (unreliable) [c17ddda0] [d2509680] jffs2_rmdir+0xa4/0x1cc [jffs2] [c17dddd0] [c026da04] vfs_rmdir+0x180/0x268 [c17dde00] [c026f4e4] do_rmdir+0x2cc/0x300 [c17ddf40] [c001a658] ret_from_syscall+0x0/0x3c The root cause is that we don't get "jffs2_inode_info.sem" before we scan list "jffs2_inode_info.dents" in function jffs2_rmdir. This patch add codes to get "jffs2_inode_info.sem" before we scan "jffs2_inode_info.dents" to slove the UAF problem. Signed-off-by: Zhe Li Reviewed-by: Hou Tao Signed-off-by: Richard Weinberger --- fs/jffs2/dir.c | 6 +++++- 1 file changed, 5 insertions(+), 1 deletion(-) (limited to 'fs/jffs2/dir.c') diff --git a/fs/jffs2/dir.c b/fs/jffs2/dir.c index f20cff1194bb..776493713153 100644 --- a/fs/jffs2/dir.c +++ b/fs/jffs2/dir.c @@ -590,10 +590,14 @@ static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry) int ret; uint32_t now = JFFS2_NOW(); + mutex_lock(&f->sem); for (fd = f->dents ; fd; fd = fd->next) { - if (fd->ino) + if (fd->ino) { + mutex_unlock(&f->sem); return -ENOTEMPTY; + } } + mutex_unlock(&f->sem); ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name, dentry->d_name.len, f, now); -- cgit v1.2.3