Description
In the Linux kernel, the following vulnerability has been resolved: tcp: add sanity checks to rx zerocopy TCP rx zerocopy intent is to map pages initially allocated from NIC drivers, not pages owned by a fs. This patch adds to can_map_frag() these additional checks: - Page must not be a compound one. - page->mapping must be NULL. This fixes the panic reported by ZhangPeng. syzbot was able to loopback packets built with sendfile(), mapping pages owned by an ext4 file to TCP rx zerocopy. r3 = socket$inet_tcp(0x2, 0x1, 0x0) mmap(&(0x7f0000ff9000/0x4000)=nil, 0x4000, 0x0, 0x12, r3, 0x0) r4 = socket$inet_tcp(0x2, 0x1, 0x0) bind$inet(r4, &(0x7f0000000000)={0x2, 0x4e24, @multicast1}, 0x10) connect$inet(r4, &(0x7f00000006c0)={0x2, 0x4e24, @empty}, 0x10) r5 = openat$dir(0xffffffffffffff9c, &(0x7f00000000c0)='./file0\x00', 0x181e42, 0x0) fallocate(r5, 0x0, 0x0, 0x85b8) sendfile(r4, r5, 0x0, 0x8ba0) getsockopt$inet_tcp_TCP_ZEROCOPY_RECEIVE(r4, 0x6, 0x23, &(0x7f00000001c0)={&(0x7f0000ffb000/0x3000)=nil, 0x3000, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0, 0x0}, &(0x7f0000000440)=0x40) r6 = openat$dir(0xffffffffffffff9c, &(0x7f00000000c0)='./file0\x00', 0x181e42, 0x0)
Affected products
Version statuses are supplied by the assigning organization. Consult the original record for detailed ranges and platform conditions.
Linux Linux
Default version status: unaffected
93ab6cc69162775201587cc9da00d5016dc890e2 to < f48bf9a83b1666d934247cb58a9887d7b3127b6faffected93ab6cc69162775201587cc9da00d5016dc890e2 to < 718f446e60316bf606946f7f42367d691d21541eaffected93ab6cc69162775201587cc9da00d5016dc890e2 to < b383d4ea272fe5795877506dcce5aad1f6330e5eaffected93ab6cc69162775201587cc9da00d5016dc890e2 to < d15cc0f66884ef2bed28c7ccbb11c102aa3a0760affected93ab6cc69162775201587cc9da00d5016dc890e2 to < 1b8adcc0e2c584fec778add7777fe28e20781e60affected93ab6cc69162775201587cc9da00d5016dc890e2 to < 577e4432f3ac810049cb7e6b71f4d96ec7c6e894affected
Linux Linux
Default version status: affected
4.18affected0 to < 4.18unaffected5.10.210 to ≤ 5.10.*unaffected5.15.149 to ≤ 5.15.*unaffected6.1.77 to ≤ 6.1.*unaffected6.6.16 to ≤ 6.6.*unaffected6.7.4 to ≤ 6.7.*unaffected6.8 to ≤ *unaffected
References
- https://git.kernel.org/stable/c/f48bf9a83b1666d934247cb58a9887d7b3127b6f ↗
- https://git.kernel.org/stable/c/718f446e60316bf606946f7f42367d691d21541e ↗
- https://git.kernel.org/stable/c/b383d4ea272fe5795877506dcce5aad1f6330e5e ↗
- https://git.kernel.org/stable/c/d15cc0f66884ef2bed28c7ccbb11c102aa3a0760 ↗
- https://git.kernel.org/stable/c/1b8adcc0e2c584fec778add7777fe28e20781e60 ↗
- https://git.kernel.org/stable/c/577e4432f3ac810049cb7e6b71f4d96ec7c6e894 ↗
- https://lists.debian.org/debian-lts-announce/2024/06/msg00017.html ↗