Skip to content
New issue

Have a question about this project? Sign up for a free GitHub account to open an issue and contact its maintainers and the community.

Sign up for GitHub

By clicking “Sign up for GitHub”, you agree to our terms of service and privacy statement. We’ll occasionally send you account related emails.

Already on GitHub? Sign in to your account

Jump to bottom

Add kernel patch for 4.14 #7

Open
wants to merge 1 commit into
base: master
Choose a base branch
from
Open

Add kernel patch for 4.14 #7

Show file tree
Hide file tree
Changes from all commits
Commits
Show all changes
1 commit
Select commit
File filter

Filter by extension

Filter by extension
Conversations
Failed to load comments.
Jump to
Jump to file
Failed to load files.
Diff view
Diff view
2 changes: 1 addition & 1 deletion README.md
View file
Open in desktop
Original file line number Diff line number Diff line change
Expand Up @@ -28,7 +28,7 @@ In particular, we modify the *generic_make_request_checks* function and insert t
## How to install
Apply the patch to the source code of your kernel and recompile it.

*The patch was originally written for Linux 3.15.1, but it remains compatible with some newer versions of Linux. Additionally, the new version for Linux 4.10 is available.*
*The patch was originally written for Linux 3.15.1, but it remains compatible with some newer versions of Linux. Updated versions for 4.10 and 4.14 are included as well.

## How to use
Simply run the following command: _blockdev --setro /dev/sdb*_ (assuming */dev/sdb* is the evidence to be write protected).
Expand Down
22 changes: 22 additions & 0 deletions kernel/linux-4.14-enforce-ro.patch
View file
Open in desktop
Original file line number Diff line number Diff line change
@@ -0,0 +1,22 @@
--- linux-master/block/blk-core.c 2016-12-16 22:23:34.000000000 +0300
+++ linux-master-patched/block/blk-core.c 2016-12-18 15:12:54.837220465 +0300
@@ -1903,6 +1903,19 @@ generic_make_request_checks(struct bio *
}
}

+ /*
+ * Block write, discard, erase, flush, zone reset commands going to a
+ * read-only device. We do this because kernel drivers often lack
+ * necessary checks and send these commands to read-only block devices.
+ */
+ if (unlikely((bio_op(bio) != REQ_OP_READ)
+ && (bio_op(bio) != REQ_OP_ZONE_REPORT)
+ && get_disk_ro(bio->bi_disk))) {
+ pr_warn("unexpected write command to %s blocked\n",
+ bio_devname(bio, b));
+ goto end_io;
+ }
+
switch (bio_op(bio)) {
case REQ_OP_DISCARD:
if (!blk_queue_discard(q))