android_kernel_xiaomi_sm7250/tools/objtool/arch/x86
Masami Hiramatsu 6bb78b3fff x86/uprobes: Do not use prefixes.nbytes when looping over prefixes.bytes
commit 4e9a5ae8df5b3365183150f6df49e49dece80d8c upstream.

Since insn.prefixes.nbytes can be bigger than the size of
insn.prefixes.bytes[] when a prefix is repeated, the proper check must
be

  insn.prefixes.bytes[i] != 0 and i < 4

instead of using insn.prefixes.nbytes.

Introduce a for_each_insn_prefix() macro for this purpose. Debugged by
Kees Cook <keescook@chromium.org>.

 [ bp: Massage commit message, sync with the respective header in tools/
   and drop "we". ]

Fixes: 2b14449835 ("uprobes, mm, x86: Add the ability to install and remove uprobes breakpoints")
Reported-by: syzbot+9b64b619f10f19d19a7c@syzkaller.appspotmail.com
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Srikar Dronamraju <srikar@linux.vnet.ibm.com>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/160697103739.3146288.7437620795200799020.stgit@devnote2
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2020-12-11 13:25:02 +01:00
..
include/asm x86/uprobes: Do not use prefixes.nbytes when looping over prefixes.bytes 2020-12-11 13:25:02 +01:00
lib x86/decoder: Add TEST opcode to Group3-2 2020-02-24 08:34:50 +01:00
tools x86/insn: Fix awk regexp warnings 2019-12-01 09:17:37 +01:00
Build objtool: Move synced files to their original relative locations 2017-11-07 10:48:23 +01:00
decode.c objtool: Fix Clang enum conversion warning 2017-12-28 13:11:13 +01:00