Date: Sat, 8 May 2021 14:32:45 +0800 From: butt3rflyh4ck <butterflyhuangxx@...il.com> To: oss-security@...ts.openwall.com Subject: Re: Linux kernel: f2fs: out-of-bounds memory access bug Hi, RedHat has assigned CVE-2021-3506 to this issue. Regards, butt3rflyh4ck. On Sat, May 8, 2021 at 12:24 AM butt3rflyh4ck <butterflyhuangxx@...il.com> wrote: > > 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 -- Active Defense Lab of Venustech
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