SEI CERT C Coding Standard

Space shortcuts

Page tree

Versions Compared

Old Version 9

changes.mady.by.user Abhijit Rao

Saved on

compared with

New Version 10

changes.mady.by.user Abhijit Rao

Saved on

Key

  • This line was added.
  • This line was removed.
  • Formatting was changed.

...

Operating System

Handling FP errors

Linux
Solaris 10
Mac OS X 10.5
<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="5f879b7aa3cdae90-578c0da3-432543a9-9a24aeb6-209968c525e57be3cb2a5b18"><ac:plain-text-body><![CDATA[Fedora Core 5

C99 FP functions - These functions are declared in fenv.h [2]
]]></ac:plain-text-body></ac:structured-macro>
Before fenv.h based functions were standardized; an alternative to using these C99/fenv function is using ieee_flags and ieee_handler  

<ac:structured-macro ac:name="unmigrated-wiki-markup" ac:schema-version="1" ac:macro-id="b6e4c869b8ed771a-0f1e2d24-4c2443cc-a9a88ce6-f2f3c1102cdac2094a4736f0"><ac:plain-text-body><![CDATA[

Windows

Structured Exception Handling - user defined handler _fpieee_flt [3]
]]></ac:plain-text-body></ac:structured-macro>
 

...

The Floating point exceptions if they go undetected will cause one or more of these conditions - security vulnerability, lower program efficiency and generate inaccurate results. Most processors stall for significant duration (sometimes upto a second or even more on 32bit desktop processors) when an operation incur a NaN.

Recommendation

Severity

Likelihood

Remediation Cost

Priority

Level

FLP03-A

1 (low)

2 (probable)

2 (medium)

P4

L3

 

References

Wiki Markup
\[1\] IEEE standard for binary floating-point arithmetic
[http://ieeexplore.ieee.org/xpl/standardstoc.jsp?isnumber=1316]

...