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Red Hat Bugzilla – Attachment 598637 Details for
Bug 621953
function readdir_r appears to return data beyond the buffer (overflow)
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[patch]
readdir.patch
readdir.patch (text/plain), 842 bytes, created by
Peter Schiffer
on 2012-07-17 13:47:45 UTC
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Description:
readdir.patch
Filename:
MIME Type:
Creator:
Peter Schiffer
Created:
2012-07-17 13:47:45 UTC
Size:
842 bytes
patch
obsolete
>--- readdir.3.orig 2012-07-17 11:38:58.000000000 +0200 >+++ readdir.3 2012-07-17 15:44:18.862536635 +0200 >@@ -89,6 +89,31 @@ > Invalid directory stream descriptor \fIdir\fP. > .SH "CONFORMING TO" > SVr4, 4.3BSD, POSIX.1-2001 >+.SH NOTES >+Since POSIX.1 does not specify the size of the >+.I d_name >+field, and other nonstandard fields may precede that field within the >+.I dirent >+structure, portable applications that use >+.BR readdir_r () >+should allocate the buffer whose address is passed in >+.IR entry >+as follows: >+.in +4n >+.nf >+ >+len = (offsetof(struct dirent, d_name) + >+ pathconf(dirpath, _PC_NAME_MAX) + 1 + sizeof(long)) >+ & -sizeof(long); >+ >+entryp = malloc(len); >+ >+.fi >+.in >+(POSIX.1 requires that >+.I d_name >+is the last field in a >+.IR "struct dirent" .) > .SH "SEE ALSO" > .BR read (2), > .BR closedir (3),
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