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Masami Hiramatsu 0d07c0ec43 x86/kprobes: Fix optprobe to detect INT3 padding correctly 
Commit

  7705dc8557 ("x86/vmlinux: Use INT3 instead of NOP for linker fill bytes")

changed the padding bytes between functions from NOP to INT3. However,
when optprobe decodes a target function it finds INT3 and gives up the
jump optimization.

Instead of giving up any INT3 detection, check whether the rest of the
bytes to the end of the function are INT3. If all of them are INT3,
those come from the linker. In that case, continue the optprobe jump
optimization.

 [ bp: Massage commit message. ]

Fixes: 7705dc8557 ("x86/vmlinux: Use INT3 instead of NOP for linker fill bytes")
Reported-by: Adam Zabrocki <pi3@pi3.com.pl>
Signed-off-by: Masami Hiramatsu <mhiramat@kernel.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Reviewed-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
Reviewed-by: Kees Cook <keescook@chromium.org>
Cc: stable@vger.kernel.org
Link: https://lkml.kernel.org/r/160767025681.3880685.16021570341428835411.stgit@devnote2
2020-12-12 15:25:17 +01:00
arch x86/kprobes: Fix optprobe to detect INT3 padding correctly 2020-12-12 15:25:17 +01:00
block block-5.10-2020-12-05 2020-12-05 14:45:30 -08:00
certs
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drivers Char/Misc driver fixes for 5.10-rc7 2020-12-06 11:48:17 -08:00
fs coredump: fix core_pattern parse error 2020-12-06 10:19:07 -08:00
include TTY fixes for 5.10-rc7 2020-12-06 11:43:50 -08:00
init Kbuild fixes for v5.10 (2nd) 2020-12-06 10:31:39 -08:00
ipc
kernel membarrier: Execute SYNC_CORE on the calling thread 2020-12-09 09:37:43 +01:00
lib zlib: export S390 symbols for zlib modules 2020-12-06 10:19:07 -08:00
LICENSES
mm mm/mmap.c: fix mmap return value when vma is merged after call_mmap() 2020-12-06 10:19:07 -08:00
net
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scripts Kbuild fixes for v5.10 (2nd) 2020-12-06 10:31:39 -08:00
security
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tools A set of fixes for x86: 2020-12-06 11:22:39 -08:00
usr
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.mailmap mailmap: add two more addresses of Uwe Kleine-König 2020-12-06 10:19:07 -08:00
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MAINTAINERS A set of updates for the interrupt subsystem: 2020-12-06 11:15:55 -08:00
Makefile Linux 5.10-rc7 2020-12-06 14:25:12 -08:00
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.