In the Linux kernel, the following vulnerability has been resolved:  jfs: add check read-only before truncation in jfstruncatenolock()  Added a check for "read-only" mode in the jfs_truncate_nolock function to avoid errors related to writing to a read-only filesystem.  Call stack:  blockwritebegin() {   jfswritefailed() {     jfstruncate() {       jfstruncatenolock() {         txEnd() {           ...           log = JFSSBI(tblk->sb)->log;           // (log == NULL)  If the isReadOnly(ip) condition is triggered in jfs_truncate_nolock, the function execution will stop, and no further data modification will occur. Instead, the xtTruncate function will be called with the "COMMIT_WMAP" flag, preventing modifications in "read-only" mode.