Entreprise française de cybersécurité depuis 2004
☎ 03 60 47 09 81 - info@securiteinfo.com
☎ 03 60 47 09 81 - info@securiteinfo.com
In the Linux kernel, the following vulnerability has been resolved:exfat: fix potential deadlock on __exfat_get_dentry_setWhen accessing a file with more entries than ES_MAX_ENTRY_NUM, the bh-arrayis allocated in __exfat_get_entry_set. The problem is that the bh-array isallocated with GFP_KERNEL. It does not make sense. In the following cases,a deadlock for sbi->s_lock between the two processes may occur. CPU0 CPU1 ---- ---- kswapd balance_pgdat lock(fs_reclaim) exfat_iterate lock(&sbi->s_lock) exfat_readdir exfat_get_uniname_from_ext_entry exfat_get_dentry_set __exfat_get_dentry_set kmalloc_array ... lock(fs_reclaim) ... evict exfat_evict_inode lock(&sbi->s_lock)To fix this, let's allocate bh-array with GFP_NOFS.
No PoCs from references.
- https://github.com/w4zu/Debian_security