Linux v3.18-rc3-82-ged78bb846e8b
This commit is contained in:
Josh Boyer
parent
5b7d233f80
commit
b1223bfd6a
@ -1,179 +0,0 @@
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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 8131be8c0af3..dc7bd1b64c46 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
@ -69,7 +69,7 @@ Summary: The Linux kernel
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# The rc snapshot level
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%define rcrev 3
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# The git snapshot level
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%define gitrev 3
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%define gitrev 4
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# Set rpm version accordingly
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%define rpmversion 3.%{upstream_sublevel}.0
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%endif
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@ -606,9 +606,6 @@ Patch26002: samsung-laptop-Add-broken-acpi-video-quirk-for-NC210.patch
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Patch26036: USB-quirks-enable-device-qualifier-quirk-for-another.patch
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Patch26038: USB-quirks-device-qualifier-quirk-for-another-Elan-t.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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Patch26057: virtio_console-move-early-VQ-enablement.patch
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Patch26058: asus-nb-wmi-Add-wapf4-quirk-for-the-X550VB.patch
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@ -1338,9 +1335,6 @@ ApplyPatch samsung-laptop-Add-broken-acpi-video-quirk-for-NC210.patch
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ApplyPatch USB-quirks-enable-device-qualifier-quirk-for-another.patch
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ApplyPatch USB-quirks-device-qualifier-quirk-for-another-Elan-t.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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ApplyPatch virtio_console-move-early-VQ-enablement.patch
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ApplyPatch asus-nb-wmi-Add-wapf4-quirk-for-the-X550VB.patch
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@ -2223,6 +2217,9 @@ fi
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# ||----w |
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# || ||
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%changelog
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* Fri Nov 07 2014 Josh Boyer <jwboyer@fedoraproject.org> - 3.18.0-0.rc3.git4.1
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- Linux v3.18-rc3-82-ged78bb846e8b
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* Thu Nov 06 2014 Josh Boyer <jwboyer@fedoraproject.org> - 3.18.0-0.rc3.git3.1
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- Linux v3.18-rc3-68-g20f3963d8f48
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2
sources
2
sources
@ -1,4 +1,4 @@
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fb30d0f29214d75cddd2faa94f73d5cf linux-3.17.tar.xz
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159e969cbc27201d8e2fa0f609dc722f perf-man-3.17.tar.gz
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84109345d207976c0a899b1d29bfeddd patch-3.18-rc3.xz
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4f816de25a25b596fb381b249d8ec86d patch-3.18-rc3-git3.xz
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521da0129d841ec24d412122699a6841 patch-3.18-rc3-git4.xz
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