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.
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