To prevent data loss, check for conflicting loop devices.
Return error if a conflicting loop device exists. This behavior can be overridden
by --force.
Signed-off-by: Stanislav Brabec <sbrabec@xxxxxxx>
---
sys-utils/losetup.c | 24 ++++++++++++++++++++++++
1 file changed, 24 insertions(+)
diff --git a/sys-utils/losetup.c b/sys-utils/losetup.c
index ef6f52b..28cde2b 100644
--- a/sys-utils/losetup.c
+++ b/sys-utils/losetup.c
@@ -732,6 +732,30 @@ int main(int argc, char **argv)
do {
const char *errpre;
+ if (!force) {
+ struct loopdev_cxt lc2;
+
+ if (loopcxt_init(&lc2, 0)) {
+ loopcxt_deinit(&lc);
+ err(EXIT_FAILURE, _("failed to initialize loopcxt"));
+ }
+ res = loopcxt_check_conflict(&lc2, file,
+ offset, sizelimit);
+ if (res < 0) {
+ loopcxt_deinit(&lc2);
+ loopcxt_deinit(&lc);
+ err(EXIT_FAILURE, _("failed to check for conflicting loop devices"));
+ }
+ if (res == 0) {
+ loopcxt_deinit(&lc2);
+ loopcxt_deinit(&lc);
+ errx(EXIT_FAILURE, _("%s: overlapping loop device exists; use --force to ignore"),
+ file);
+ }
+ res = 0;
+ loopcxt_deinit(&lc2);
+ }
+
/* Note that loopcxt_{find_unused,set_device}() resets
* loopcxt struct.
*/
--
2.9.2
--
Best Regards / S pozdravem,
Stanislav Brabec
software developer
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