1.7 KiB
CVE-2023-52618
Description
In the Linux kernel, the following vulnerability has been resolved:block/rnbd-srv: Check for unlikely string overflowSince "dev_search_path" can technically be as large as PATH_MAX,there was a risk of truncation when copying it and a second stringinto "full_path" since it was also PATH_MAX sized. The W=1 builds werereporting this warning:drivers/block/rnbd/rnbd-srv.c: In function 'process_msg_open.isra':drivers/block/rnbd/rnbd-srv.c:616:51: warning: '%s' directive output may be truncated writing up to 254 bytes into a region of size between 0 and 4095 [-Wformat-truncation=] 616 | snprintf(full_path, PATH_MAX, "%s/%s", | ^~In function 'rnbd_srv_get_full_path', inlined from 'process_msg_open.isra' at drivers/block/rnbd/rnbd-srv.c:721:14: drivers/block/rnbd/rnbd-srv.c:616:17: note: 'snprintf' output between 2 and 4351 bytes into a destination of size 4096 616 | snprintf(full_path, PATH_MAX, "%s/%s", | ^~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~ 617 | dev_search_path, dev_name); | ~~~~~~~~~~~~~~~~~~~~~~~~~~To fix this, unconditionally check for truncation (as was already donefor the case where "%SESSNAME%" was present).
POC
Reference
No PoCs from references.