linux-user: Fix initialization of the heap contents when allocating new pages
Technically the new mmapped pages are already initialized to zero since they are anonymous, however we have to take care with the contents that come from the remaining part of the previous page: it may contains garbage data due to a previous heap usage (grown then shrunken). This patch completes commit 55f08c84. The problem could be reproduced when emulating the build process of Perl 5.12.3 on ARMedSlack 13.37: make[1]: Entering directory `/tmp/perl-5.12.3/cpan/Compress-Raw-Bzip2' cc -c -I. -fno-strict-aliasing -pipe -fstack-protector \ -I/usr/local/include -D_LARGEFILE_SOURCE -D_FILE_OFFSET_BITS=64 \ -O2 -DVERSION=\"2.024\" -DXS_VERSION=\"2.024\" -fPIC "-I../.." \ -DBZ_NO_STDIO decompress.c decompress.c: In function 'BZ2_decompress': decompress.c:621:1: internal compiler error: Segmentation fault Signed-off-by: Riku Voipio <riku.voipio@linaro.org> Signed-off-by: Laurent ALFONSI <laurent.alfonsi@st.com> Signed-off-by: Cédric VINCENT <cedric.vincent@st.com>
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@ -797,6 +797,15 @@ abi_long do_brk(abi_ulong new_brk)
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MAP_ANON|MAP_PRIVATE, 0, 0));
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if (mapped_addr == brk_page) {
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/* Heap contents are initialized to zero, as for anonymous
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* mapped pages. Technically the new pages are already
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* initialized to zero since they *are* anonymous mapped
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* pages, however we have to take care with the contents that
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* come from the remaining part of the previous page: it may
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* contains garbage data due to a previous heap usage (grown
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* then shrunken). */
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memset(g2h(target_brk), 0, brk_page - target_brk);
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target_brk = new_brk;
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brk_page = HOST_PAGE_ALIGN(target_brk);
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DEBUGF_BRK("%#010x (mapped_addr == brk_page)\n", target_brk);
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