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Red Hat Bugzilla – Attachment 587263 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), 784 bytes, created by
Peter Schiffer
on 2012-05-28 16:48:19 UTC
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Description:
readdir.patch
Filename:
MIME Type:
Creator:
Peter Schiffer
Created:
2012-05-28 16:48:19 UTC
Size:
784 bytes
patch
obsolete
>--- readdir.3.org 2006-08-03 15:57:30.000000000 +0200 >+++ readdir.3 2012-05-28 18:41:54.219817369 +0200 >@@ -89,6 +89,29 @@ > 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 >+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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