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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
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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
include bpf: fix narrower loads on s390 2019-07-23 13:59:33 -07:00
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kernel bpf: fix narrower loads on s390 2019-07-23 13:59:33 -07:00
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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
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tools selftests/bpf: fix sendmsg6_prog on s390 2019-07-22 16:19:06 +02:00
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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
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.