Skip to main content

Browse the archive

https://github.com/torvalds/linux
23 October 2021, 00:29:24 UTC
Revision 4e9a5ae8df5b3365183150f6df49e49dece80d8c authored by Masami Hiramatsu on 03 December 2020, 04:50:37 UTC, committed by Borislav Petkov on 06 December 2020, 08:58:13 UTC 
x86/uprobes: Do not use prefixes.nbytes when looping over prefixes.bytes
 
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: 2b1444983508 ("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
1 parent 8dcc0e1
History
Tip revision: 4e9a5ae8df5b3365183150f6df49e49dece80d8c authored by Masami Hiramatsu on 03 December 2020, 04:50:37 UTC
x86/uprobes: Do not use prefixes.nbytes when looping over prefixes.bytes
Tip revision: 4e9a5ae
File Mode Size
include
.gitignore -rw-r--r-- 94 bytes
Kconfig -rw-r--r-- 7.7 KB
Makefile -rw-r--r-- 2.9 KB
default_cpio_list -rw-r--r-- 153 bytes
gen_init_cpio.c -rw-r--r-- 12.8 KB
gen_initramfs.sh -rwxr-xr-x 5.7 KB
initramfs_data.S -rw-r--r-- 1.2 KB
back to top