net: add validation for the socket syscall protocol argument (CVE-2015-8543)
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linux (4.3.1-2) UNRELEASED; urgency=medium
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* net: add validation for the socket syscall protocol argument (CVE-2015-8543)
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-- Ben Hutchings <ben@decadent.org.uk> Mon, 14 Dec 2015 20:59:37 +0000
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linux (4.3.1-1) unstable; urgency=medium
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linux (4.3.1-1) unstable; urgency=medium
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* New upstream stable update:
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* New upstream stable update:
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82
debian/patches/bugfix/all/net-add-validation-for-the-socket-syscall-protocol.patch
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82
debian/patches/bugfix/all/net-add-validation-for-the-socket-syscall-protocol.patch
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From: Hannes Frederic Sowa <hannes@stressinduktion.org>
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Subject: net: add validation for the socket syscall protocol argument
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Date: Mon, 14 Dec 2015 17:17:49 +0100
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Origin: http://article.gmane.org/gmane.linux.network/391482
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郭永刚 reported that one could simply crash the kernel as root by
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using a simple program:
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int socket_fd;
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struct sockaddr_in addr;
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addr.sin_port = 0;
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addr.sin_addr.s_addr = INADDR_ANY;
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addr.sin_family = 10;
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socket_fd = socket(10,3,0x40000000);
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connect(socket_fd , &addr,16);
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AF_INET, AF_INET6 sockets actually only support 8-bit protocol
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identifiers. inet_sock's skc_protocol field thus is sized accordingly,
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thus larger protocol identifiers simply cut off the higher bits and
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store a zero in the protocol fields.
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This could lead to e.g. NULL function pointer because as a result of
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the cut off inet_num is zero and we call down to inet_autobind, which
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is NULL for raw sockets.
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kernel: Call Trace:
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kernel: [<ffffffff816db90e>] ? inet_autobind+0x2e/0x70
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kernel: [<ffffffff816db9a4>] inet_dgram_connect+0x54/0x80
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kernel: [<ffffffff81645069>] SYSC_connect+0xd9/0x110
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kernel: [<ffffffff810ac51b>] ? ptrace_notify+0x5b/0x80
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kernel: [<ffffffff810236d8>] ? syscall_trace_enter_phase2+0x108/0x200
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kernel: [<ffffffff81645e0e>] SyS_connect+0xe/0x10
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kernel: [<ffffffff81779515>] tracesys_phase2+0x84/0x89
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I found no particular commit which introduced this problem.
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CVE: CVE-2015-8543
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Reported-by: 郭永刚 <guoyonggang@360.cn>
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Signed-off-by: Hannes Frederic Sowa <hannes@stressinduktion.org>
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---
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net/ipv4/af_inet.c | 3 +++
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net/ipv6/af_inet6.c | 3 +++
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net/socket.c | 3 +++
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3 files changed, 9 insertions(+)
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--- a/net/ipv4/af_inet.c
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+++ b/net/ipv4/af_inet.c
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@@ -261,6 +261,9 @@ static int inet_create(struct net *net,
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int try_loading_module = 0;
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int err;
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+ if (protocol >= IPPROTO_MAX)
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+ return -EINVAL;
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+
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sock->state = SS_UNCONNECTED;
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/* Look for the requested type/protocol pair. */
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--- a/net/ipv6/af_inet6.c
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+++ b/net/ipv6/af_inet6.c
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@@ -109,6 +109,9 @@ static int inet6_create(struct net *net,
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int try_loading_module = 0;
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int err;
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+ if (protocol >= IPPROTO_MAX)
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+ return -EINVAL;
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+
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/* Look for the requested type/protocol pair. */
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lookup_protocol:
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err = -ESOCKTNOSUPPORT;
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--- a/net/socket.c
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+++ b/net/socket.c
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@@ -1105,6 +1105,9 @@ int __sock_create(struct net *net, int f
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return -EAFNOSUPPORT;
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if (type < 0 || type >= SOCK_MAX)
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return -EINVAL;
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+ /* upper bound should be tested by per-protocol .create callbacks */
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+ if (protocol < 0)
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+ return -EINVAL;
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/* Compatibility.
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@ -98,6 +98,7 @@ bugfix/all/btrfs-fix-truncation-of-compressed-and-inlined-exten.patch
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bugfix/x86/drm-i915-shut-up-gen8-sde-irq-dmesg-noise.patch
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bugfix/x86/drm-i915-shut-up-gen8-sde-irq-dmesg-noise.patch
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bugfix/arm/arm-dts-kirkwood-fix-qnap-ts219-power-off.patch
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bugfix/arm/arm-dts-kirkwood-fix-qnap-ts219-power-off.patch
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bugfix/x86/drm-i915-mark-uneven-memory-banks-on-gen4-desktop-as.patch
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bugfix/x86/drm-i915-mark-uneven-memory-banks-on-gen4-desktop-as.patch
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bugfix/all/net-add-validation-for-the-socket-syscall-protocol.patch
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bugfix/x86/bios-return-actual-size-of-the-buffer-retrieved-via-_rom.patch
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bugfix/x86/bios-return-actual-size-of-the-buffer-retrieved-via-_rom.patch
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features/arm/mfd-s2mps11-add-manual-shutdown-method-for-odroid-xu.patch
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features/arm/mfd-s2mps11-add-manual-shutdown-method-for-odroid-xu.patch
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features/arm/arm-dts-fix-power-off-method-for-exynos5422-odroidxu.patch
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features/arm/arm-dts-fix-power-off-method-for-exynos5422-odroidxu.patch
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