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Steven Rostedt (VMware) 938aa33f14 tracing: Add length protection to histogram string copies 
The string copies to the histogram storage has a max size of 256 bytes
(defined by MAX_FILTER_STR_VAL). Only the string size of the event field
needs to be copied to the event storage, but no more than what is in the
event storage. Although nothing should be bigger than 256 bytes, there's
no protection against overwriting of the storage if one day there is.

Copy no more than the destination size, and enforce it.

Also had to turn MAX_FILTER_STR_VAL into an unsigned int, to keep the
min() comparison of the string sizes of comparable types.

Link: https://lore.kernel.org/all/CAHk-=wjREUihCGrtRBwfX47y_KrLCGjiq3t6QtoNJpmVrAEb1w@mail.gmail.com/
Link: https://lkml.kernel.org/r/20211114132834.183429a4@rorschach.local.home

Cc: Ingo Molnar <mingo@kernel.org>
Cc: Andrew Morton <akpm@linux-foundation.org>
Cc: Tom Zanussi <zanussi@kernel.org>
Reported-by: Linus Torvalds <torvalds@linux-foundation.org>
Reviewed-by: Masami Hiramatsu <mhiramat@kernel.org>
Fixes: 63f84ae6b8 ("tracing/histogram: Do not copy the fixed-size char array field over the field size")
Signed-off-by: Steven Rostedt (VMware) <rostedt@goodmis.org>
2021-11-14 21:21:08 -05:00
arch ftrace: disable preemption when recursion locked 2021-10-27 11:21:49 -04:00
block SCSI fixes on 20210925 2021-09-25 16:05:56 -07:00
certs
crypto
Documentation tracing/histogram: Update division by 0 documentation 2021-11-01 20:46:29 -04:00
drivers Fix two EDAC drivers using the wrong value type for the DIMM mode. 2021-09-26 12:18:10 -07:00
fs tracefs: Have tracefs directories not set OTH permission bits by default 2021-10-08 18:08:43 -04:00
include tracing: Add length protection to histogram string copies 2021-11-14 21:21:08 -05:00
init bootconfig: Rename xbc_destroy_all() to xbc_exit() 2021-10-10 20:44:05 -04:00
ipc
kernel tracing: Add length protection to histogram string copies 2021-11-14 21:21:08 -05:00
lib bootconfig: Initialize ret in xbc_parse_tree() 2021-10-27 11:22:09 -04:00
LICENSES
mm mm: fix uninitialized use in overcommit_policy_handler 2021-09-24 16:13:35 -07:00
net
samples ftrace/samples: Add missing prototype for my_direct_func 2021-11-01 20:56:51 -04:00
scripts kasan: always respect CONFIG_KASAN_STACK 2021-09-24 16:13:35 -07:00
security
sound
tools tracing/selftests: Add tests for hist trigger expression parsing 2021-11-01 20:47:00 -04:00
usr
virt
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS MAINTAINERS: Update KPROBES and TRACING entries 2021-10-26 17:23:46 -04:00
Makefile Linux 5.15-rc3 2021-09-26 14:08:19 -07:00
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.