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* [Bug libc/17674] New: ctype functions with wrong return values and crashes
@ 2014-12-03 15:13 bhaak at gmx dot net
2014-12-03 15:28 ` [Bug libc/17674] " schwab@linux-m68k.org
0 siblings, 1 reply; 2+ messages in thread
From: bhaak at gmx dot net @ 2014-12-03 15:13 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=17674
Bug ID: 17674
Summary: ctype functions with wrong return values and crashes
Product: glibc
Version: 2.20
Status: NEW
Severity: normal
Priority: P2
Component: libc
Assignee: unassigned at sourceware dot org
Reporter: bhaak at gmx dot net
CC: drepper.fsp at gmail dot com
Created attachment 7992
--> https://sourceware.org/bugzilla/attachment.cgi?id=7992&action=edit
C code demonstrating wrong return values and crash of isblank
The ctype functions (probably all, I tested with isblank, isspace, and isalpha)
return wrong results if they are called with int values bigger than UCHAR_MAX.
Furthermore, for some big int values it crashes with a segmentation fault.
The attached C file outputs all values from 0 to INT_MAX which return true from
isblank. On a Gentoo machine it crashed with 151056, on an Ubuntu machine with
163152.
I know that the ctype functions are technically in POSIX only defined for
values representable as an unsigned char or the value of EOF but this is stupid
nevertheless for a library function.
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* [Bug libc/17674] ctype functions with wrong return values and crashes
2014-12-03 15:13 [Bug libc/17674] New: ctype functions with wrong return values and crashes bhaak at gmx dot net
@ 2014-12-03 15:28 ` schwab@linux-m68k.org
0 siblings, 0 replies; 2+ messages in thread
From: schwab@linux-m68k.org @ 2014-12-03 15:28 UTC (permalink / raw)
To: glibc-bugs
https://sourceware.org/bugzilla/show_bug.cgi?id=17674
Andreas Schwab <schwab@linux-m68k.org> changed:
What |Removed |Added
----------------------------------------------------------------------------
Status|NEW |RESOLVED
Resolution|--- |INVALID
--- Comment #1 from Andreas Schwab <schwab@linux-m68k.org> ---
This is perfectly valid undefined behaviour.
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2014-12-03 15:13 [Bug libc/17674] New: ctype functions with wrong return values and crashes bhaak at gmx dot net
2014-12-03 15:28 ` [Bug libc/17674] " schwab@linux-m68k.org
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