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06a22d897d
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Eric Dumazet 06a22d897d bpf: fix access to skb_shared_info->gso_segs 
It is possible we reach bpf_convert_ctx_access() with
si->dst_reg == si->src_reg

Therefore, we need to load BPF_REG_AX before eventually
mangling si->src_reg.

syzbot generated this x86 code :
   3:   55                      push   %rbp
   4:   48 89 e5                mov    %rsp,%rbp
   7:   48 81 ec 00 00 00 00    sub    $0x0,%rsp // Might be avoided ?
   e:   53                      push   %rbx
   f:   41 55                   push   %r13
  11:   41 56                   push   %r14
  13:   41 57                   push   %r15
  15:   6a 00                   pushq  $0x0
  17:   31 c0                   xor    %eax,%eax
  19:   48 8b bf c0 00 00 00    mov    0xc0(%rdi),%rdi
  20:   44 8b 97 bc 00 00 00    mov    0xbc(%rdi),%r10d
  27:   4c 01 d7                add    %r10,%rdi
  2a:   48 0f b7 7f 06          movzwq 0x6(%rdi),%rdi // Crash
  2f:   5b                      pop    %rbx
  30:   41 5f                   pop    %r15
  32:   41 5e                   pop    %r14
  34:   41 5d                   pop    %r13
  36:   5b                      pop    %rbx
  37:   c9                      leaveq
  38:   c3                      retq

Fixes: d9ff286a0f ("bpf: allow BPF programs access skb_shared_info->gso_segs field")
Signed-off-by: Eric Dumazet <edumazet@google.com>
Reported-by: syzbot <syzkaller@googlegroups.com>
Signed-off-by: Alexei Starovoitov <ast@kernel.org>
2019-07-23 14:12:37 -07:00
arch powerpc updates for 5.3 2019-07-13 16:08:36 -07:00
block for-5.3/block-20190708 2019-07-09 10:45:06 -07:00
certs Revert "Merge tag 'keys-acl-20190703' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs" 2019-07-10 18:43:43 -07:00
crypto USB / PHY patches for 5.3-rc1 2019-07-11 15:40:06 -07:00
Documentation net/tls: fix transition through disconnect with close 2019-07-22 16:04:17 +02:00
drivers ag71xx: fix return value check in ag71xx_probe() 2019-07-18 20:33:48 -07:00
fs for-5.3/io_uring-20190711 2019-07-13 10:36:53 -07:00
include bpf: fix narrower loads on s390 2019-07-23 13:59:33 -07:00
init Kbuild updates for v5.3 2019-07-12 16:03:16 -07:00
ipc
kernel bpf: fix narrower loads on s390 2019-07-23 13:59:33 -07:00
lib for-5.3/io_uring-20190711 2019-07-13 10:36:53 -07:00
LICENSES
mm Driver Core and debugfs changes for 5.3-rc1 2019-07-12 12:24:03 -07:00
net bpf: fix access to skb_shared_info->gso_segs 2019-07-23 14:12:37 -07:00
samples Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2019-07-18 14:04:45 -07:00
scripts powerpc updates for 5.3 2019-07-13 16:08:36 -07:00
security Merge branch 'akpm' (patches from Andrew) 2019-07-12 11:40:28 -07:00
sound Driver Core and debugfs changes for 5.3-rc1 2019-07-12 12:24:03 -07:00
tools selftests/bpf: fix sendmsg6_prog on s390 2019-07-22 16:19:06 +02:00
usr kbuild: compile-test exported headers to ensure they are self-contained 2019-07-08 23:13:57 +09:00
virt ARM: 2019-07-12 15:35:14 -07:00
.clang-format
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.gitignore kbuild: do not create wrappers for header-test-y 2019-07-09 10:10:27 +09:00
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MAINTAINERS Merge git://git.kernel.org/pub/scm/linux/kernel/git/bpf/bpf 2019-07-18 14:04:45 -07:00
Makefile Kbuild updates for v5.3 2019-07-12 16:03:16 -07:00
README

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.