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Although applying these guidelines decreases the chance that your code will be susceptible to a buffer over ow, they are not suf cient or always necessary to guarantee the safe use of strncpy() There are any number of ways in which strncpy() can be used without introducing security vulnerabilities Static bounds or bounds calculated from other dynamic sources can be safe in many circumstances, depending on the structure of the program and feasible execution paths Proper bounds checks can guarantee that the range of input copied to a destination buffer will always contain a null terminator Null-terminating or zeroing out the entire destination buffer and then bounding strncpy() to copy 1 byte less than the length of buffer will result in the destination being properly null-terminated However, many of these usage patterns are error prone because they are more dif cult for both humans and tools to verify and should be avoided Instead, give preference to one simple and easy-to-verify convention The rest of this subsection uses real-world examples to demonstrate the importance of these guidelines Use a Safe Bound Bound calls to strncpy() with a value derived from the size of the destination buffer The pitfall this guideline addresses occurs when strncpy() is bounded by the size of its source rather than destination buffer, which effectively reduces its safety to that of strcpy() The code in Example 621, from Version 80 of the Gaim instant messaging client, contains a remotely exploitable buffer over ow vulnerability In the code, the call to strncpy()

class Comment < ActiveRecord::Base belongs_to :user # author of the comment belongs_to :commentable, :polymorphic => true end class User < ActiveRecord::Base has_many :comments has_many :commentables, :through => :comments end >> Userfirstcomments ActiveRecord::HasManyThroughAssociationPolymorphicError: Cannot have a has_many :through association 'User#commentables' on the polymorphic object 'Comment#commentable'

If you really need it, has_many :through is possible with polymorphic associations, but only by specifying exactly what type of polymorphic associations you want To do so, you must use the :source_type option In most cases, you will also need to use the :source option, since the association name will not match the interface name used for the polymorphic association:

class User < ActiveRecord::Base has_many :comments has_many :commented_timesheets, :through => :comments, :source => :commentable, :source_type => 'Timesheet' has_many :commented_billable_weeks, :through => :comments, :source => :commentable, :source_type => 'BillableWeek' end

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copies data from a user-controlled buffer into the 32-byte stack buffer temp The buffer over ow can occur because the call to strncpy() is bounded by the number of characters encountered in the source buffer before a terminating character, which could exceed the capacity of the destination

We could have chosen to include these four components in the original LoanApplication composite However, as the application grows, that strategy will likely result in a brittle and dif cult-tomaintain system In the future, all or part of the credit-scoring components may need to be changed In addition, con guring all components in one composite is likely to result in a very unstructured application that is dif cult to decipher (not to mention developers stepping on one another as they modify parts of the single composite) Instead, good design suggests that we encapsulate the creditscoring function in a composite, which is then used as a component by the LoanApplication composite Figure 54 depicts this visually

It s verbose, and the whole scheme loses its elegance if you go this route, but it works:

>> Userfirstcommented_timesheets => [#<Timesheet >]

if (strncmp(status, "200 OK", 6)) { /* It's not valid Kill this off */ char temp[32]; const char *c; /* Eww */ if ((c = strchr(status, '\r')) || (c = strchr(status, '\n')) || (c = strchr(status, '\0'))) { strncpy(temp, status, c - status); temp[c - status] = '\0'; } gaim_debug_error("msn", "Received non-OK result: %s\n", temp); slpcall->wasted = TRUE; /* msn_slp_call_destroy(slpcall); */ return slpcall; }

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