[Bug libc/7065] Support building glibc with -fstack-protector or -fstack-protector-all

["nix at esperi dot org dot uk" <sourceware-bugzilla at sourceware dot org>]

------- Additional Comments From nix at esperi dot org dot uk  2008-12-04 00:53 -------
test environment: 2.6.27.7 kernel+headers, glibc 2.8, GCC 4.3.3 20081121 
(prerelease), binutils 2.19.

config flags (my standard set for this machine):

/usr/packages/glibc/2.9/configure --prefix=/usr --enable-shared \
    --enable-profile --disable-bounded --enable-bind-now        \
    --enable-add-ons=nptl,libidn --enable-kernel=2.6.25         \
    --enable-check-abi=warn --enable-omitfp                     \
    --enable-stackguard-randomization TIMEOUTFACTOR=5

Below, PASS means 'baseline test failures only'. (I also compared
configure output to verify that -fstack-protector addition did not
change the results of any configure tests, and verified that the
appropriate -fstack-protector actually appeared in gcc commandlines at
the appropriate times.)

baseline:                              PASS, by definition
patch applied, no flags specified:     PASS
-fstack-protector in CFLAGS:           PASS
-fstack-protector-all in CFLAGS:       one failure due to #7066, buffer overrun
--without-stack-protector:             PASS
--with-stack-protector:                PASS
--with-stack-protector=all:            one failure due to #7066, buffer overrun

Test failures for baseline (unpatched):

math/test-ildoubl.out:

testing long double (inline functions)
Failure: Test: expm1 (1) == M_El - 1.0
Result:
 is:          1.71828182845904523532e+00   0xd.bf0a8b14576953500000p-3
 should be:   1.71828182845904523543e+00   0xd.bf0a8b14576953600000p-3
 difference:  1.08420217248550443401e-19   0x8.00000000000000000000p-66
 ulp       :  1.0000
 max.ulp   :  0.0000
Maximal error of `expm1'
 is      : 1 ulp
 accepted: 0 ulp

Test suite completed:
  3618 test cases plus 3005 tests for exception flags executed.
  2 errors occurred.

elf/check-localplt.out:

--- ../scripts/data/localplt-i386-linux-gnu.data        2006-01-11 
21:06:19.000000000 +0000
+++ -   2008-11-30 20:52:09.962033876 +0000
@@ -1,4 +1,5 @@
 libc.so: _Unwind_Find_FDE
+libc.so: __bzero
 libc.so: calloc
 libc.so: free
 libc.so: malloc

(This looks like something missing from localplt-i386-linux-gnu.data to
me, not a bug.)

(Holes in test coverage: not tested with a GCC too old to support
-fstack-protector. Static testing not performed: see #7064.)

-- 


http://sourceware.org/bugzilla/show_bug.cgi?id=7065

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