Sourceware Bugzilla – Attachment 3625 Details for
Bug 7075
sprintf(buf, "%sfoo", buf) has different results with -O2 -D_FORTIFY_SOURCE=2 (__sprintf_chk bug?)
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[patch]
work-around pre-trunc behavior
no-sprintf-pre-truncate.diff (text/plain), 550 bytes, created by
Kees Cook
on 2008-12-24 17:40:22 UTC
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Description:
work-around pre-trunc behavior
Filename:
MIME Type:
Creator:
Kees Cook
Created:
2008-12-24 17:40:22 UTC
Size:
550 bytes
patch
obsolete
>Index: glibc-2.9/debug/vsprintf_chk.c >=================================================================== >--- glibc-2.9.orig/debug/vsprintf_chk.c 2008-12-23 21:30:07.000000000 -0800 >+++ glibc-2.9/debug/vsprintf_chk.c 2008-12-23 21:30:19.000000000 -0800 >@@ -76,7 +76,9 @@ > > _IO_no_init (&f._sbf._f, _IO_USER_LOCK, -1, NULL, NULL); > _IO_JUMPS ((struct _IO_FILE_plus *) &f._sbf) = &_IO_str_chk_jumps; >+/* > s[0] = '\0'; >+*/ > _IO_str_init_static_internal (&f, s, slen - 1, s); > > /* For flags > 0 (i.e. __USE_FORTIFY_LEVEL > 1) request that %n
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