Repository : http://git.fedorahosted.org/git/?p=secure-coding.git On branch : master >--------------------------------------------------------------- commit e32825c5c6860a273c27896c390b1219ba651f66 Author: Florian Weimer <fweimer@xxxxxxxxxx> Date: Tue Sep 17 11:11:39 2013 +0200 C++ operator new[] has been fixed in recent GCC versions >--------------------------------------------------------------- defensive-coding/en-US/CXX-Language.xml | 16 +++++++++------- 1 files changed, 9 insertions(+), 7 deletions(-) diff --git a/defensive-coding/en-US/CXX-Language.xml b/defensive-coding/en-US/CXX-Language.xml index 9dbc4f3..b6e6df9 100644 --- a/defensive-coding/en-US/CXX-Language.xml +++ b/defensive-coding/en-US/CXX-Language.xml @@ -19,8 +19,9 @@ array. Current GCC versions generate code that performs a computation of the form <literal>sizeof(T) * size_t(n) + cookie_size</literal>, where <literal>cookie_size</literal> is - currently at most 8. This computation can overflow, and - GCC-generated code does not detect this. + currently at most 8. This computation can overflow, and GCC + versions prior to 4.8 generated code which did not detect this. + (Fedora 18 was the first release which fixed this in GCC.) </para> <para> The <literal>std::vector</literal> template can be used instead @@ -28,11 +29,12 @@ overflow internally.) </para> <para> - If there is no alternative to <literal>operator new[]</literal>, - code which allocates arrays with a variable length must check - for overflow manually. For the <literal>new T[n]</literal> - example, the size check could be <literal>n || (n > 0 && - n > (size_t(-1) - 8) / sizeof(T))</literal>. (See <xref + If there is no alternative to <literal>operator new[]</literal> + and the sources will be compiled with older GCC versions, code + which allocates arrays with a variable length must check for + overflow manually. For the <literal>new T[n]</literal> example, + the size check could be <literal>n || (n > 0 && n > + (size_t(-1) - 8) / sizeof(T))</literal>. (See <xref linkend="sect-Defensive_Coding-C-Arithmetic"/>.) If there are additional dimensions (which must be constants according to the C++ standard), these should be included as factors in the -- security mailing list security@xxxxxxxxxxxxxxxxxxxxxxx https://admin.fedoraproject.org/mailman/listinfo/security
