* [Bug regex/25814] Consecutive + operators accepted but have no effect except consuming more memory
2020-04-12 4:06 [Bug regex/25814] New: Consecutive + operators accepted but have no effect except consuming more memory dpmendenhall at gmail dot com
@ 2020-04-12 11:55 ` schwab@linux-m68k.org
2020-04-12 12:15 ` schwab@linux-m68k.org
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From: schwab@linux-m68k.org @ 2020-04-12 11:55 UTC (permalink / raw)
To: glibc-bugs-regex
https://sourceware.org/bugzilla/show_bug.cgi?id=25814
--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> ---
RE_CONTEXT_INVALID_DUP is only part of RE_SYNTAX_POSIX_BASIC, but not
RE_SYNTAX_POSIX_EXTENDED.
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* [Bug regex/25814] Consecutive + operators accepted but have no effect except consuming more memory
2020-04-12 4:06 [Bug regex/25814] New: Consecutive + operators accepted but have no effect except consuming more memory dpmendenhall at gmail dot com
2020-04-12 11:55 ` [Bug regex/25814] " schwab@linux-m68k.org
@ 2020-04-12 12:15 ` schwab@linux-m68k.org
2020-04-13 2:58 ` dpmendenhall at gmail dot com
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7 siblings, 0 replies; 9+ messages in thread
From: schwab@linux-m68k.org @ 2020-04-12 12:15 UTC (permalink / raw)
To: glibc-bugs-regex
https://sourceware.org/bugzilla/show_bug.cgi?id=25814
--- Comment #2 from Andreas Schwab <schwab@linux-m68k.org> ---
POSIX says that multiple adjacent duplication symbols produce undefined results
(both BRE and ERE).
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* [Bug regex/25814] Consecutive + operators accepted but have no effect except consuming more memory
2020-04-12 4:06 [Bug regex/25814] New: Consecutive + operators accepted but have no effect except consuming more memory dpmendenhall at gmail dot com
2020-04-12 11:55 ` [Bug regex/25814] " schwab@linux-m68k.org
2020-04-12 12:15 ` schwab@linux-m68k.org
@ 2020-04-13 2:58 ` dpmendenhall at gmail dot com
2020-04-13 2:59 ` dpmendenhall at gmail dot com
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From: dpmendenhall at gmail dot com @ 2020-04-13 2:58 UTC (permalink / raw)
To: glibc-bugs-regex
https://sourceware.org/bugzilla/show_bug.cgi?id=25814
--- Comment #3 from David Mendenhall <dpmendenhall at gmail dot com> ---
Created attachment 12453
--> https://sourceware.org/bugzilla/attachment.cgi?id=12453&action=edit
Same as regex.c, but BRE syntax
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* [Bug regex/25814] Consecutive + operators accepted but have no effect except consuming more memory
2020-04-12 4:06 [Bug regex/25814] New: Consecutive + operators accepted but have no effect except consuming more memory dpmendenhall at gmail dot com
` (2 preceding siblings ...)
2020-04-13 2:58 ` dpmendenhall at gmail dot com
@ 2020-04-13 2:59 ` dpmendenhall at gmail dot com
2020-04-13 3:02 ` dpmendenhall at gmail dot com
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From: dpmendenhall at gmail dot com @ 2020-04-13 2:59 UTC (permalink / raw)
To: glibc-bugs-regex
https://sourceware.org/bugzilla/show_bug.cgi?id=25814
--- Comment #4 from David Mendenhall <dpmendenhall at gmail dot com> ---
> RE_CONTEXT_INVALID_DUP is only part of RE_SYNTAX_POSIX_BASIC, but not RE_SYNTAX_POSIX_EXTENDED
The same behavior is reproducible with basic syntax. See regex-basic.c
attached.
$ gcc -o regex-basic regex-basic.c
$ ./regex-basic 0\\+ 0
pattern: 0\+
string: 0
regex matched
$ ./regex-basic 0\\+\\+ 0
pattern: 0\+\+
string: 0
regex matched
./regex-basic
0\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+\\+
0
pattern: 0\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+\+
string: 0
<hangs consuming all system memory>
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* [Bug regex/25814] Consecutive + operators accepted but have no effect except consuming more memory
2020-04-12 4:06 [Bug regex/25814] New: Consecutive + operators accepted but have no effect except consuming more memory dpmendenhall at gmail dot com
` (3 preceding siblings ...)
2020-04-13 2:59 ` dpmendenhall at gmail dot com
@ 2020-04-13 3:02 ` dpmendenhall at gmail dot com
2020-04-13 11:05 ` schwab@linux-m68k.org
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From: dpmendenhall at gmail dot com @ 2020-04-13 3:02 UTC (permalink / raw)
To: glibc-bugs-regex
https://sourceware.org/bugzilla/show_bug.cgi?id=25814
--- Comment #5 from David Mendenhall <dpmendenhall at gmail dot com> ---
> POSIX says that multiple adjacent duplication symbols produce undefined results (both BRE and ERE).
Thanks for pointing this out. I was unaware.
So do you think this bug should be closed as INVALID or WONTFIX, or is there
value in investigating the excessive memory consumption and/or rejecting on
compilation like bionic does?
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* [Bug regex/25814] Consecutive + operators accepted but have no effect except consuming more memory
2020-04-12 4:06 [Bug regex/25814] New: Consecutive + operators accepted but have no effect except consuming more memory dpmendenhall at gmail dot com
` (4 preceding siblings ...)
2020-04-13 3:02 ` dpmendenhall at gmail dot com
@ 2020-04-13 11:05 ` schwab@linux-m68k.org
2020-04-13 15:35 ` dpmendenhall at gmail dot com
2020-04-15 15:53 ` dpmendenhall at gmail dot com
7 siblings, 0 replies; 9+ messages in thread
From: schwab@linux-m68k.org @ 2020-04-13 11:05 UTC (permalink / raw)
To: glibc-bugs-regex
https://sourceware.org/bugzilla/show_bug.cgi?id=25814
--- Comment #6 from Andreas Schwab <schwab@linux-m68k.org> ---
0\+ is not a valid BRE.
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* [Bug regex/25814] Consecutive + operators accepted but have no effect except consuming more memory
2020-04-12 4:06 [Bug regex/25814] New: Consecutive + operators accepted but have no effect except consuming more memory dpmendenhall at gmail dot com
` (5 preceding siblings ...)
2020-04-13 11:05 ` schwab@linux-m68k.org
@ 2020-04-13 15:35 ` dpmendenhall at gmail dot com
2020-04-15 15:53 ` dpmendenhall at gmail dot com
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From: dpmendenhall at gmail dot com @ 2020-04-13 15:35 UTC (permalink / raw)
To: glibc-bugs-regex
https://sourceware.org/bugzilla/show_bug.cgi?id=25814
--- Comment #7 from David Mendenhall <dpmendenhall at gmail dot com> ---
Really? The regex.h comments suggest otherwise.
#define RE_SYNTAX_POSIX_BASIC \
(_RE_SYNTAX_POSIX_COMMON | RE_BK_PLUS_QM | RE_CONTEXT_INVALID_DUP)
/* If this bit is not set, then + and ? are operators, and \+ and \? are
literals.
If set, then \+ and \? are operators and + and ? are literals. */
# define RE_BK_PLUS_QM (RE_BACKSLASH_ESCAPE_IN_LISTS << 1)
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* [Bug regex/25814] Consecutive + operators accepted but have no effect except consuming more memory
2020-04-12 4:06 [Bug regex/25814] New: Consecutive + operators accepted but have no effect except consuming more memory dpmendenhall at gmail dot com
` (6 preceding siblings ...)
2020-04-13 15:35 ` dpmendenhall at gmail dot com
@ 2020-04-15 15:53 ` dpmendenhall at gmail dot com
7 siblings, 0 replies; 9+ messages in thread
From: dpmendenhall at gmail dot com @ 2020-04-15 15:53 UTC (permalink / raw)
To: glibc-bugs-regex
https://sourceware.org/bugzilla/show_bug.cgi?id=25814
David Mendenhall <dpmendenhall at gmail dot com> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|UNCONFIRMED |RESOLVED
Resolution|--- |DUPLICATE
--- Comment #8 from David Mendenhall <dpmendenhall at gmail dot com> ---
Dup of 20095
*** This bug has been marked as a duplicate of bug 20095 ***
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