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bash: Fix for CVE-2014-7186 and CVE-2014-7187

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This is a followup patch to incomplete CVE-2014-6271 fix code execution via
specially-crafted environment

https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-7186
https://cve.mitre.org/cgi-bin/cvename.cgi?name=CVE-2014-7187

(From OE-Core daisy rev: 153d1125659df9e5c09e35a58bd51be184cb13c1)

(From OE-Core rev: bdfe1e3770aeee9a1a7c65d4834f1a99820d3140)

Signed-off-by: Sona Sarmadi <sona.sarmadi@enea.com>
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
Signed-off-by: Richard Purdie <richard.purdie@linuxfoundation.org>
This commit is contained in:
Catalin Popeanga
2014-10-09 14:24:29 +02:00
committed by Richard Purdie
parent f7dba9940c
commit db7891c164
4 changed files with 268 additions and 0 deletions
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meta/recipes-extended/bash/bash-4.2/cve-2014-7186_cve-2014-7187.patch
+167
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bash: Fix for CVE-2014-7186 and CVE-2014-7187
Upstream-Status: Backport {GNU Patch-ID: bash42-051}
Downloaded from: http://ftp.gnu.org/gnu/bash/bash-4.2-patches/bash42-051
Author: Chet Ramey <chet.ramey@case.edu>
Signed-off-by: Paul Eggleton <paul.eggleton@linux.intel.com>
BASH PATCH REPORT
=================
Bash-Release: 4.2
Patch-ID: bash42-051
Bug-Reported-by: Florian Weimer <fweimer@redhat.com>
Bug-Reference-ID:
Bug-Reference-URL:
Bug-Description:
There are two local buffer overflows in parse.y that can cause the shell
to dump core when given many here-documents attached to a single command
or many nested loops.
Patch (apply with `patch -p0'):
*** ../bash-4.2.50/parse.y 2014-09-27 12:18:53.000000000 -0400
--- parse.y 2014-09-30 19:24:19.000000000 -0400
***************
*** 168,171 ****
--- 168,174 ----
static int reserved_word_acceptable __P((int));
static int yylex __P((void));
+
+ static void push_heredoc __P((REDIRECT *));
+ static char *mk_alexpansion __P((char *));
static int alias_expand_token __P((char *));
static int time_command_acceptable __P((void));
***************
*** 265,269 ****
/* Variables to manage the task of reading here documents, because we need to
defer the reading until after a complete command has been collected. */
! static REDIRECT *redir_stack[10];
int need_here_doc;
--- 268,274 ----
/* Variables to manage the task of reading here documents, because we need to
defer the reading until after a complete command has been collected. */
! #define HEREDOC_MAX 16
!
! static REDIRECT *redir_stack[HEREDOC_MAX];
int need_here_doc;
***************
*** 307,311 ****
index is decremented after a case, select, or for command is parsed. */
#define MAX_CASE_NEST 128
! static int word_lineno[MAX_CASE_NEST];
static int word_top = -1;
--- 312,316 ----
index is decremented after a case, select, or for command is parsed. */
#define MAX_CASE_NEST 128
! static int word_lineno[MAX_CASE_NEST+1];
static int word_top = -1;
***************
*** 520,524 ****
redir.filename = $2;
$$ = make_redirection (source, r_reading_until, redir, 0);
! redir_stack[need_here_doc++] = $$;
}
| NUMBER LESS_LESS WORD
--- 525,529 ----
redir.filename = $2;
$$ = make_redirection (source, r_reading_until, redir, 0);
! push_heredoc ($$);
}
| NUMBER LESS_LESS WORD
***************
*** 527,531 ****
redir.filename = $3;
$$ = make_redirection (source, r_reading_until, redir, 0);
! redir_stack[need_here_doc++] = $$;
}
| REDIR_WORD LESS_LESS WORD
--- 532,536 ----
redir.filename = $3;
$$ = make_redirection (source, r_reading_until, redir, 0);
! push_heredoc ($$);
}
| REDIR_WORD LESS_LESS WORD
***************
*** 534,538 ****
redir.filename = $3;
$$ = make_redirection (source, r_reading_until, redir, REDIR_VARASSIGN);
! redir_stack[need_here_doc++] = $$;
}
| LESS_LESS_MINUS WORD
--- 539,543 ----
redir.filename = $3;
$$ = make_redirection (source, r_reading_until, redir, REDIR_VARASSIGN);
! push_heredoc ($$);
}
| LESS_LESS_MINUS WORD
***************
*** 541,545 ****
redir.filename = $2;
$$ = make_redirection (source, r_deblank_reading_until, redir, 0);
! redir_stack[need_here_doc++] = $$;
}
| NUMBER LESS_LESS_MINUS WORD
--- 546,550 ----
redir.filename = $2;
$$ = make_redirection (source, r_deblank_reading_until, redir, 0);
! push_heredoc ($$);
}
| NUMBER LESS_LESS_MINUS WORD
***************
*** 548,552 ****
redir.filename = $3;
$$ = make_redirection (source, r_deblank_reading_until, redir, 0);
! redir_stack[need_here_doc++] = $$;
}
| REDIR_WORD LESS_LESS_MINUS WORD
--- 553,557 ----
redir.filename = $3;
$$ = make_redirection (source, r_deblank_reading_until, redir, 0);
! push_heredoc ($$);
}
| REDIR_WORD LESS_LESS_MINUS WORD
***************
*** 555,559 ****
redir.filename = $3;
$$ = make_redirection (source, r_deblank_reading_until, redir, REDIR_VARASSIGN);
! redir_stack[need_here_doc++] = $$;
}
| LESS_LESS_LESS WORD
--- 560,564 ----
redir.filename = $3;
$$ = make_redirection (source, r_deblank_reading_until, redir, REDIR_VARASSIGN);
! push_heredoc ($$);
}
| LESS_LESS_LESS WORD
***************
*** 2534,2537 ****
--- 2539,2557 ----
static int esacs_needed_count;
+ static void
+ push_heredoc (r)
+ REDIRECT *r;
+ {
+ if (need_here_doc >= HEREDOC_MAX)
+ {
+ last_command_exit_value = EX_BADUSAGE;
+ need_here_doc = 0;
+ report_syntax_error (_("maximum here-document count exceeded"));
+ reset_parser ();
+ exit_shell (last_command_exit_value);
+ }
+ redir_stack[need_here_doc++] = r;
+ }
+
void
gather_here_documents ()