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Separate mmap area from program loading (relocation) area

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We need to separate the two because the heap of a PIE is created in
the area to which it is mapped.

Related commits:

b1309a5d: PIE is mapped at map_end instead of at
          user_start
c4219655: Interpreter is mapped to map_start to make a
          system call that dereferences a NULL pointer fail

[dominique.martinet@cea.fr: Also add ULONG_MAX and friend macroes,
 used for data_min]
[ken.sato.ty@hitachi-solutions.com: fix execve]
Change-Id: I8ecaf22b7965090ab67bebece57c68283ba23664
This commit is contained in:
Masamichi Takagi
2019-01-15 09:48:28 +00:00
committed by Dominique Martinet
parent 97e0219f50
commit 4d215de641
5 changed files with 31 additions and 19 deletions
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5
arch/x86_64/kernel/include/arch-memory.h
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@ -41,8 +41,9 @@
#define LARGE_PAGE_MASK (~((unsigned long)LARGE_PAGE_SIZE - 1))
#define LARGE_PAGE_P2ALIGN (LARGE_PAGE_SHIFT - PAGE_SHIFT)
#define USER_END 0x0000800000000000UL
#define TASK_UNMAPPED_BASE 0x00002AAAAAA00000UL
#define USER_END 0x0000800000000000UL
#define LD_TASK_UNMAPPED_BASE 0x0000155555500000UL
#define TASK_UNMAPPED_BASE 0x00002AAAAAA00000UL
/*
* Canonical negative addresses (i.e., the smallest kernel virtual address)