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x86: make TASK_SIZE_MAX usable from assembly code

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For 64-bit the only thing missing was a strategic _AC, and for 32-bit we
need to use __PAGE_OFFSET instead of PAGE_OFFSET in the TASK_SIZE
definition to escape the explicit unsigned long cast.  This just works
because __PAGE_OFFSET is defined using _AC itself and thus never needs
the cast anyway.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Christoph Hellwig 2020-09-03 16:22:39 +02:00 committed by Al Viro
parent 999c83e8ff
commit a1d826d475
2 changed files with 3 additions and 3 deletions
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4
arch/x86/include/asm/page_32_types.h
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@ -44,8 +44,8 @@
/*
* User space process size: 3GB (default).
*/
#define IA32_PAGE_OFFSET PAGE_OFFSET
#define TASK_SIZE PAGE_OFFSET
#define IA32_PAGE_OFFSET __PAGE_OFFSET
#define TASK_SIZE __PAGE_OFFSET
#define TASK_SIZE_LOW TASK_SIZE
#define TASK_SIZE_MAX TASK_SIZE
#define DEFAULT_MAP_WINDOW TASK_SIZE

2
arch/x86/include/asm/page_64_types.h
View file

@ -76,7 +76,7 @@
*
* With page table isolation enabled, we map the LDT in ... [stay tuned]
*/
#define TASK_SIZE_MAX ((1UL << __VIRTUAL_MASK_SHIFT) - PAGE_SIZE)
#define TASK_SIZE_MAX ((_AC(1,UL) << __VIRTUAL_MASK_SHIFT) - PAGE_SIZE)
#define DEFAULT_MAP_WINDOW ((1UL << 47) - PAGE_SIZE)