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.