CVE-2024-42300

In the Linux kernel, the following vulnerability has been resolved:

erofs: fix race in zerofsget_gbuf()

In zerofsget_gbuf(), the current task may be migrated to another CPU between z_erofs_gbuf_id() and spin_lock(&gbuf->lock).

Therefore, zerofsput_gbuf() will trigger the following issue which was found by stress test:

<2>[772156.434168] kernel BUG at fs/erofs/zutil.c:58! .. <4>[772156.435007] <4>[772156.439237] CPU: 0 PID: 3078 Comm: stress Kdump: loaded Tainted: G E 6.10.0-rc7+ #2 <4>[772156.439239] Hardware name: Alibaba Cloud Alibaba Cloud ECS, BIOS 1.0.0 01/01/2017 <4>[772156.439241] pstate: 83400005 (Nzcv daif +PAN -UAO +TCO +DIT -SSBS BTYPE=--) <4>[772156.439243] pc : zerofsputgbuf+0x64/0x70 [erofs] <4>[772156.439252] lr : zerofslz4decompress+0x600/0x6a0 [erofs] .. <6>[772156.445958] stress (3127): dropcaches: 1 <4>[772156.446120] Call trace: <4>[772156.446121] zerofsputgbuf+0x64/0x70 [erofs] <4>[772156.446761] zerofslz4decompress+0x600/0x6a0 [erofs] <4>[772156.446897] zerofsdecompressqueue+0x740/0xa10 [erofs] <4>[772156.447036] zerofsrunqueue+0x428/0x8c0 [erofs] <4>[772156.447160] zerofsreadahead+0x224/0x390 [erofs] ..