Date: Sat, 8 May 2021 00:24:11 +0800 From: butt3rflyh4ck <butterflyhuangxx@...il.com> To: oss-security@...ts.openwall.com Subject: Re: Linux kernel: f2fs: out-of-bounds memory access bug The patch is for this issue in upstream linux: https://git.kernel.org/pub/scm/linux/kernel/git/jaegeuk/f2fs.git/commit/?h=dev&id=b862676e371715456c9dade7990c8004996d0d9e Regards, butt3rflyh4ck. On Mon, Mar 29, 2021 at 12:00 AM butt3rflyh4ck <butterflyhuangxx@...il.com> wrote: > > Hi, > > I reported an out of bounds memory access bug in get_next_net_page() > in fs/f2fs/node.c and reproduce in 5.12.0-rc3. Now the patch is out > and tested it in 5.12.0-rc4. > > Root Cause: > the f2fs_flush_nat_entries() function is called during the > checkpointing process, > when it flush dirty nats in nat entry sets, it will call > __flush_nat_entry_set(), but before call it,the legality of nids is > not correctly tested. If the nids is out of range, may access > out-of-bounds memory. > > Some details and Patch for this issue: > https://firstname.lastname@example.org/msg2520013.html > Now the patch is not available in upstream, CVE is not assigned. > > Now announced on oss-security@...ts.openwl.com. > > This issue was discovered by the ADLab of venustech. > > Regards, > butt3rflyh4ck. -- Active Defense Lab of Venustech
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