scsi: target: Fix recursive locking in __configfs_open_file()
- Published
- Last modified
- Where the record stands: published, rejected by its publisher, or superseded by another id.What do these mean? →
- published
- Whether CISA lists it in its Known Exploited Vulnerabilities catalog: proof that attackers are using it.What do these mean? →
- Not listed in CISA KEV
- Fix
- Fixed in 4.10, 4.15, 4.20, 6.1.167, 6.6.130, and 3 more
- Whether working attack code is public (Exploit-DB, Metasploit, Nuclei or GitHub). Public code makes attacks easier.What do these mean? →
- None on Exploit-DB, Metasploit or GitHub
Summary
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.
Timeline
- CVE published
- Record last updated
Affected versions
- Linux Linux
From b0841eefd9693827afb9888235e26ddd098f9cef · fixed in 3161ef61f121d4573cad5b57c92188dcd9b284b3; From b0841eefd9693827afb9888235e26ddd098f9cef · fixed in e8ef82cb6443d5f3260b1b830e17f03dda4229ea; From b0841eefd9693827afb9888235e26ddd098f9cef · fixed in 4fcfa424a581d823cb1a9676e3eefe6ca17e453a; From b0841eefd9693827afb9888235e26ddd098f9cef · fixed in 9a5641024fbfd9b24fe65984ad85fea10a3ae438; From b0841eefd9693827afb9888235e26ddd098f9cef · fixed in 142eacb50fb903a4c10dee7e67b6e79ebb36a582; From b0841eefd9693827afb9888235e26ddd098f9cef · fixed in 14d4ac19d1895397532eec407433c5d74d9da53b; From 4.9.201 · fixed in 4.10; From 4.14.154 · fixed in 4.15; From 4.19.84 · fixed in 4.20
- Linux Linux
5.3
- KernelLinux
From 5.3.0 · fixed in 6.1.167; From 6.2.0 · fixed in 6.6.130; From 6.7.0 · fixed in 6.12.77; From 6.13.0 · fixed in 6.18.17; From 6.19.0 · fixed in 6.19.7