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| author | Masami Hiramatsu <mhiramat@kernel.org> | 2020-12-03 13:50:50 +0900 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2020-12-11 13:22:13 +0100 |
| commit | e7a9b51b7e1fc8ca42856d1ecbba76165d29f55f (patch) | |
| tree | 83e5b27218df8c8e1461f3b8494811663d2a1069 | |
| parent | 5c2b4b4f9fa5b765b927e361e3d310bcb5773015 (diff) | |
| download | linux-stable-e7a9b51b7e1fc8ca42856d1ecbba76165d29f55f.tar.gz linux-stable-e7a9b51b7e1fc8ca42856d1ecbba76165d29f55f.tar.bz2 linux-stable-e7a9b51b7e1fc8ca42856d1ecbba76165d29f55f.zip | |
x86/insn-eval: Use new for_each_insn_prefix() macro to loop over prefixes bytes
commit 12cb908a11b2544b5f53e9af856e6b6a90ed5533 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. Use the new
for_each_insn_prefix() macro which does it correctly.
Debugged by Kees Cook <keescook@chromium.org>.
[ bp: Massage commit message. ]
Fixes: 32d0b95300db ("x86/insn-eval: Add utility functions to get segment selector")
Reported-by: syzbot+9b64b619f10f19d19a7c@syzkaller.appspotmail.com
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/160697104969.3146288.16329307586428270032.stgit@devnote2
[sudip: adjust context]
Signed-off-by: Sudip Mukherjee <sudipm.mukherjee@gmail.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
| -rw-r--r-- | arch/x86/lib/insn-eval.c | 5 |
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/lib/insn-eval.c b/arch/x86/lib/insn-eval.c index 5e69603ff63f..694f32845116 100644 --- a/arch/x86/lib/insn-eval.c +++ b/arch/x86/lib/insn-eval.c @@ -70,14 +70,15 @@ static int get_seg_reg_override_idx(struct insn *insn) { int idx = INAT_SEG_REG_DEFAULT; int num_overrides = 0, i; + insn_byte_t p; insn_get_prefixes(insn); /* Look for any segment override prefixes. */ - for (i = 0; i < insn->prefixes.nbytes; i++) { + for_each_insn_prefix(insn, i, p) { insn_attr_t attr; - attr = inat_get_opcode_attribute(insn->prefixes.bytes[i]); + attr = inat_get_opcode_attribute(p); switch (attr) { case INAT_MAKE_PREFIX(INAT_PFX_CS): idx = INAT_SEG_REG_CS; |