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linux-user: Adjust task_unmapped_base for reserved_va

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Ensure that the chosen values for mmap_next_start and
task_unmapped_base are within the guest address space.

Tested-by: Helge Deller <deller@gmx.de>
Reviewed-by: Akihiko Odaki <akihiko.odaki@daynix.com>
Signed-off-by: Richard Henderson <richard.henderson@linaro.org>
This commit is contained in:
Richard Henderson 2023-08-02 14:25:27 -07:00
parent 0450cf0897
commit c8fb5cf97d
3 changed files with 64 additions and 16 deletions
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34
linux-user/user-mmap.h
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@ -18,6 +18,39 @@
#ifndef LINUX_USER_USER_MMAP_H
#define LINUX_USER_USER_MMAP_H
#if HOST_LONG_BITS == 64 && TARGET_ABI_BITS == 64
#ifdef TARGET_AARCH64
# define TASK_UNMAPPED_BASE 0x5500000000
#else
# define TASK_UNMAPPED_BASE (1ul << 38)
#endif
#else
#ifdef TARGET_HPPA
# define TASK_UNMAPPED_BASE 0xfa000000
#else
# define TASK_UNMAPPED_BASE 0x40000000
#endif
#endif
/*
* Guest parameters for the ADDR_COMPAT_LAYOUT personality
* (at present this is the only layout supported by QEMU).
*
* TASK_UNMAPPED_BASE: For mmap without hint (addr != 0), the search
* for unused virtual memory begins at TASK_UNMAPPED_BASE.
*
* task_unmapped_base: When the guest address space is limited via -R,
* the value of TASK_UNMAPPED_BASE is adjusted to fit.
*/
extern abi_ulong task_unmapped_base;
/*
* mmap_next_start: The base address for the next mmap without hint,
* increased after each successful map, starting at task_unmapped_base.
* This is an optimization within QEMU and not part of ADDR_COMPAT_LAYOUT.
*/
extern abi_ulong mmap_next_start;
int target_mprotect(abi_ulong start, abi_ulong len, int prot);
abi_long target_mmap(abi_ulong start, abi_ulong len, int prot,
int flags, int fd, off_t offset);
@ -26,7 +59,6 @@ abi_long target_mremap(abi_ulong old_addr, abi_ulong old_size,
abi_ulong new_size, unsigned long flags,
abi_ulong new_addr);
abi_long target_madvise(abi_ulong start, abi_ulong len_in, int advice);
extern abi_ulong mmap_next_start;
abi_ulong mmap_find_vma(abi_ulong, abi_ulong, abi_ulong);
void mmap_fork_start(void);
void mmap_fork_end(int child);