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s390: limit brk randomization to 32MB
For a 64-bit process the randomization of the program break is quite large with 1GB. That is as big as the randomization of the anonymous mapping base, for a test case started with '/lib/ld64.so.1 <exec>' it can happen that the heap is placed after the stack. To avoid this limit the program break randomization to 32MB for 64-bit and keep 8MB for 31-bit. Reported-by: Stefan Liebler <stli@linux.ibm.com> Signed-off-by: Martin Schwidefsky <schwidefsky@de.ibm.com>
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1 changed files with 7 additions and 4 deletions
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@ -252,11 +252,14 @@ do { \
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/*
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* Cache aliasing on the latest machines calls for a mapping granularity
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* of 512KB. For 64-bit processes use a 512KB alignment and a randomization
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* of up to 1GB. For 31-bit processes the virtual address space is limited,
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* use no alignment and limit the randomization to 8MB.
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* of 512KB for the anonymous mapping base. For 64-bit processes use a
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* 512KB alignment and a randomization of up to 1GB. For 31-bit processes
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* the virtual address space is limited, use no alignment and limit the
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* randomization to 8MB.
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* For the additional randomization of the program break use 32MB for
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* 64-bit and 8MB for 31-bit.
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*/
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#define BRK_RND_MASK (is_compat_task() ? 0x7ffUL : 0x3ffffUL)
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#define BRK_RND_MASK (is_compat_task() ? 0x7ffUL : 0x1fffUL)
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#define MMAP_RND_MASK (is_compat_task() ? 0x7ffUL : 0x3ff80UL)
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#define MMAP_ALIGN_MASK (is_compat_task() ? 0 : 0x7fUL)
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#define STACK_RND_MASK MMAP_RND_MASK
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