Description (CNA)
In the Linux kernel, the following vulnerability has been resolved: scsi: target: Fix recursive locking in __configfs_open_file() In flush_write_buffer, &p->frag_sem is acquired and then the loaded store function is called, which, here, is target_core_item_dbroot_store(). This function called filp_open(), following which these functions were called (in reverse order), according to the call trace: down_read __configfs_open_file do_dentry_open vfs_open do_open path_openat do_filp_open file_open_name filp_open target_core_item_dbroot_store flush_write_buffer configfs_write_iter target_core_item_dbroot_store() tries to validate the new file path by trying to open the file path provided to it; however, in this case, the bug report shows: db_root: not a directory: /sys/kernel/config/target/dbroot indicating that the same configfs file was tried to be opened, on which it is currently working on. Thus, it is trying to acquire frag_sem semaphore of the same file of which it already holds the semaphore obtained in flush_write_buffer(), leading to acquiring the semaphore in a nested manner and a possibility of recursive locking. Fix this by modifying target_core_item_dbroot_store() to use kern_path() instead of filp_open() to avoid opening the file using filesystem-specific function __configfs_open_file(), and further modifying it to make this fix compatible.
Affected (CNA)
| Vendor / product | Versions |
|---|---|
| Linux / Linux | affected b0841eefd9693827afb9888235e26ddd098f9cef before 3161ef61f121d4573cad5b57c92188dcd9b284b3; affected b0841eefd9693827afb9888235e26ddd098f9cef before e8ef82cb6443d5f3260b1b830e17f03dda4229ea; affected b0841eefd9693827afb9888235e26ddd098f9cef before 4fcfa424a581d823cb1a9676e3eefe6ca17e453a; affected b0841eefd9693827afb9888235e26ddd098f9cef before 9a5641024fbfd9b24fe65984ad85fea10a3ae438; affected b0841eefd9693827afb9888235e26ddd098f9cef before 142eacb50fb903a4c10dee7e67b6e79ebb36a582; affected b0841eefd9693827afb9888235e26ddd098f9cef before 14d4ac19d1895397532eec407433c5d74d9da53b; affected 49824b5c875087a52672b0c8e8ecbefe6f773532; affected 09e21253d17f53bdb5aac0e0dbd057a29fcbe8d1; affected 0dfc45be875a378c2a3a4d6ed8e668ec8eb75073; affected 4.9.201 before 4.10; affected 4.14.154 before 4.15; affected 4.19.84 before 4.20 |
| Linux / Linux | affected 5.3; unaffected 0 before 5.3; unaffected 6.1.167 through 6.1.*; unaffected 6.6.130 through 6.6.*; unaffected 6.12.77 through 6.12.*; unaffected 6.18.17 through 6.18.*; unaffected 6.19.7 through 6.19.*; unaffected 7.0 through * |
CWE
No CWE identifiers supplied.
References
- https://git.kernel.org/stable/c/3161ef61f121d4573cad5b57c92188dcd9b284b3
- https://git.kernel.org/stable/c/e8ef82cb6443d5f3260b1b830e17f03dda4229ea
- https://git.kernel.org/stable/c/4fcfa424a581d823cb1a9676e3eefe6ca17e453a
- https://git.kernel.org/stable/c/9a5641024fbfd9b24fe65984ad85fea10a3ae438
- https://git.kernel.org/stable/c/142eacb50fb903a4c10dee7e67b6e79ebb36a582
- https://git.kernel.org/stable/c/14d4ac19d1895397532eec407433c5d74d9da53b
ADP enrichment
No English description supplied.