CVE-2014-8086 ext4: race condition (rhbz 1151353 1152608)
This commit is contained in:
Josh Boyer
parent
3680d2e48d
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From: Dmitry Monakhov <dmonakhov@xxxxxxxx>
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Date: Thu, 9 Oct 2014 15:14:47 +0400
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Subject: [PATCH] ext4: fix race between write and fcntl(F_SETFL)
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O_DIRECT flags can be toggeled via fcntl(F_SETFL).
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But this value checked twice inside ext4_file_write_iter() and __generic_file_write()
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which result in BUG_ON (see typical stack trace below)
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In order to fix this we have to use our own copy of __generic_file_write and
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pass o_direct status explicitly.
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TESTCASE: xfstest:generic/326 (http://patchwork.ozlabs.org/patch/397949/)
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kernel BUG at fs/ext4/inode.c:2960!
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invalid opcode: 0000 [#1] SMP
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Modules linked in: brd iTCO_wdt lpc_ich mfd_core igb ptp dm_mirror dm_region_hash dm_log dm_mod
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CPU: 6 PID: 5505 Comm: aio-dio-fcntl-r Not tainted 3.17.0-rc2-00176-gff5c017 #161
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Hardware name: Intel Corporation W2600CR/W2600CR, BIOS SE5C600.86B.99.99.x028.061320111235 06/13/2011
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task: ffff88080e95a7c0 ti: ffff88080f908000 task.ti: ffff88080f908000
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RIP: 0010:[<ffffffff811fabf2>] [<ffffffff811fabf2>] ext4_direct_IO+0x162/0x3d0
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RSP: 0018:ffff88080f90bb58 EFLAGS: 00010246
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RAX: 0000000000000400 RBX: ffff88080fdb2a28 RCX: 00000000a802c818
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RDX: 0000040000080000 RSI: ffff88080d8aeb80 RDI: 0000000000000001
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RBP: ffff88080f90bbc8 R08: 0000000000000000 R09: 0000000000001581
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R10: 0000000000000000 R11: 0000000000000000 R12: ffff88080d8aeb80
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R13: ffff88080f90bbf8 R14: ffff88080fdb28c8 R15: ffff88080fdb2a28
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FS: 00007f23b2055700(0000) GS:ffff880818400000(0000) knlGS:0000000000000000
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CS: 0010 DS: 0000 ES: 0000 CR0: 0000000080050033
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CR2: 00007f23b2045000 CR3: 000000080cedf000 CR4: 00000000000407e0
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Stack:
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ffff88080f90bb98 0000000000000000 7ffffffffffffffe ffff88080fdb2c30
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0000000000000200 0000000000000200 0000000000000001 0000000000000200
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ffff88080f90bbc8 ffff88080fdb2c30 ffff88080f90be08 0000000000000200
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Call Trace:
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[<ffffffff8112ca9d>] generic_file_direct_write+0xed/0x180
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[<ffffffff8112f2b2>] __generic_file_write_iter+0x222/0x370
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[<ffffffff811f495b>] ext4_file_write_iter+0x34b/0x400
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[<ffffffff811bd709>] ? aio_run_iocb+0x239/0x410
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[<ffffffff811bd709>] ? aio_run_iocb+0x239/0x410
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[<ffffffff810990e5>] ? local_clock+0x25/0x30
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[<ffffffff810abd94>] ? __lock_acquire+0x274/0x700
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[<ffffffff811f4610>] ? ext4_unwritten_wait+0xb0/0xb0
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[<ffffffff811bd756>] aio_run_iocb+0x286/0x410
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[<ffffffff810990e5>] ? local_clock+0x25/0x30
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[<ffffffff810ac359>] ? lock_release_holdtime+0x29/0x190
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[<ffffffff811bc05b>] ? lookup_ioctx+0x4b/0xf0
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[<ffffffff811bde3b>] do_io_submit+0x55b/0x740
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[<ffffffff811bdcaa>] ? do_io_submit+0x3ca/0x740
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[<ffffffff811be030>] SyS_io_submit+0x10/0x20
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[<ffffffff815ce192>] system_call_fastpath+0x16/0x1b
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Code: 01 48 8b 80 f0 01 00 00 48 8b 18 49 8b 45 10 0f 85 f1 01 00 00 48 03 45 c8 48 3b 43 48 0f 8f e3 01 00 00 49 83 7c 24 18 00 75 04 <0f> 0b eb fe f0 ff 83 ec 01 00 00 49 8b 44 24 18 8b 00 85 c0 89
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RIP [<ffffffff811fabf2>] ext4_direct_IO+0x162/0x3d0
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RSP <ffff88080f90bb58>
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Upstream-status: Submitted but likely not accepted
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Bugzilla: 1152608
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Reported-by: Sasha Levin <sasha.levin@xxxxxxxxxx>
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Signed-off-by: Dmitry Monakhov <dmonakhov@xxxxxxxxxx>
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---
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fs/ext4/file.c | 96 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++-
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1 file changed, 95 insertions(+), 1 deletion(-)
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diff --git a/fs/ext4/file.c b/fs/ext4/file.c
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index aca7b24a4432..8477eb259809 100644
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--- a/fs/ext4/file.c
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+++ b/fs/ext4/file.c
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@@ -88,6 +88,100 @@ ext4_unaligned_aio(struct inode *inode, struct iov_iter *from, loff_t pos)
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return 0;
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}
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+/**
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+ * copy of __generic_file_write_iter with explicit O_DIRECT status
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+ * @iocb: IO state structure (file, offset, etc.)
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+ * @from: iov_iter with data to write
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+ * @direct: perform O_DIRECT IO
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+ */
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+static ssize_t
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+__ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from, int direct)
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+{
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+ struct file *file = iocb->ki_filp;
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+ struct address_space *mapping = file->f_mapping;
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+ struct inode *inode = mapping->host;
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+ loff_t pos = iocb->ki_pos;
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+ ssize_t written = 0;
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+ ssize_t err;
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+ ssize_t status;
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+ size_t count = iov_iter_count(from);
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+
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+ /* We can write back this queue in page reclaim */
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+ current->backing_dev_info = mapping->backing_dev_info;
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+ err = generic_write_checks(file, &pos, &count, S_ISBLK(inode->i_mode));
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+ if (err)
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+ goto out;
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+
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+ if (count == 0)
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+ goto out;
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+
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+ iov_iter_truncate(from, count);
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+
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+ err = file_remove_suid(file);
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+ if (err)
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+ goto out;
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+
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+ err = file_update_time(file);
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+ if (err)
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+ goto out;
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+
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+ /* coalesce the iovecs and go direct-to-BIO for O_DIRECT */
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+ if (unlikely(direct)) {
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+ loff_t endbyte;
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+
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+ written = generic_file_direct_write(iocb, from, pos);
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+ if (written < 0 || written == count)
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+ goto out;
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+
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+ /*
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+ * direct-io write to a hole: fall through to buffered I/O
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+ * for completing the rest of the request.
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+ */
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+ pos += written;
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+ count -= written;
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+
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+ status = generic_perform_write(file, from, pos);
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+ /*
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+ * If generic_perform_write() returned a synchronous error
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+ * then we want to return the number of bytes which were
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+ * direct-written, or the error code if that was zero. Note
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+ * that this differs from normal direct-io semantics, which
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+ * will return -EFOO even if some bytes were written.
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+ */
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+ if (unlikely(status < 0)) {
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+ err = status;
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+ goto out;
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+ }
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+ iocb->ki_pos = pos + status;
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+ /*
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+ * We need to ensure that the page cache pages are written to
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+ * disk and invalidated to preserve the expected O_DIRECT
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+ * semantics.
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+ */
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+ endbyte = pos + status - 1;
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+ err = filemap_write_and_wait_range(file->f_mapping, pos,
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+ endbyte);
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+ if (err == 0) {
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+ written += status;
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+ invalidate_mapping_pages(mapping,
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+ pos >> PAGE_CACHE_SHIFT,
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+ endbyte >> PAGE_CACHE_SHIFT);
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+ } else {
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+ /*
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+ * We don't know how much we wrote, so just return
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+ * the number of bytes which were direct-written
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+ */
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+ }
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+ } else {
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+ written = generic_perform_write(file, from, pos);
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+ if (likely(written >= 0))
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+ iocb->ki_pos = pos + written;
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+ }
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+out:
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+ current->backing_dev_info = NULL;
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+ return written ? written : err;
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+}
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+
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static ssize_t
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ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
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{
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@@ -172,7 +266,7 @@ ext4_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
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}
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}
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- ret = __generic_file_write_iter(iocb, from);
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+ ret = __ext4_file_write_iter(iocb, from, o_direct);
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mutex_unlock(&inode->i_mutex);
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if (ret > 0) {
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--
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1.9.3
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11
kernel.spec
11
kernel.spec
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@ -42,7 +42,7 @@ Summary: The Linux kernel
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# For non-released -rc kernels, this will be appended after the rcX and
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# gitX tags, so a 3 here would become part of release "0.rcX.gitX.3"
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#
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%global baserelease 301
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%global baserelease 302
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%global fedora_build %{baserelease}
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# base_sublevel is the kernel version we're starting with and patching
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@ -653,6 +653,9 @@ Patch26053: btrfs-Fix-the-wrong-condition-judgment-about-subset-.patch
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Patch26054: Btrfs-fix-race-in-WAIT_SYNC-ioctl.patch
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Patch26055: Revert-Btrfs-race-free-update-of-commit-root-for-ro-.patch
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#CVE-2014-8086 rhbz 1151353 1152608
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Patch26056: ext4-fix-race-between-write-and-fcntl-F_SETFL.patch
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# git clone ssh://git.fedorahosted.org/git/kernel-arm64.git, git diff master...devel
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Patch30000: kernel-arm64.patch
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@ -1419,6 +1422,9 @@ ApplyPatch btrfs-Fix-the-wrong-condition-judgment-about-subset-.patch
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ApplyPatch Btrfs-fix-race-in-WAIT_SYNC-ioctl.patch
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ApplyPatch Revert-Btrfs-race-free-update-of-commit-root-for-ro-.patch
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#CVE-2014-8086 rhbz 1151353 1152608
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ApplyPatch ext4-fix-race-between-write-and-fcntl-F_SETFL.patch
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%if 0%{?aarch64patches}
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ApplyPatch kernel-arm64.patch
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%ifnarch aarch64 # this is stupid, but i want to notice before secondary koji does.
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@ -2287,6 +2293,9 @@ fi
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# ||----w |
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# || ||
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%changelog
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* Fri Oct 17 2014 Josh Boyer <jwboyer@fedoraproject.org> - 3.17.1-302
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- CVE-2014-8086 ext4: race condition (rhbz 1151353 1152608)
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* Fri Oct 17 2014 Josh Boyer <jwboyer@fedoraproject.org> - 3.17.1-301
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- Enable B43_PHY_G to fix b43 driver regression (rhbz 1152502)
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- Add even more btrfs corruption/error fixes
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