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| author | David S. Miller <davem@davemloft.net> | 2012-05-24 22:41:58 +0200 |
|---|---|---|
| committer | David S. Miller <davem@davemloft.net> | 2012-05-24 22:41:58 +0200 |
| commit | c5389831cda3b38a56606a348a537a1332f2d729 (patch) | |
| tree | 1df9f89d287af436be4bd405e50dd3c1d48d354e /arch | |
| parent | lib: Sparc's strncpy_from_user is generic enough, move under lib/ (diff) | |
| download | linux-c5389831cda3b38a56606a348a537a1332f2d729.tar.xz linux-c5389831cda3b38a56606a348a537a1332f2d729.zip | |
sparc: Fix user_addr_max() definition.
We need to use TASK_SIZE because for 64-bit tasks the value
of STACK_TOP actually sits in the middle of the address space
so we'll get false-negatives.
Adjust the TASK_SIZE definition on sparc64 to accomodate this,
in the context in which user_addr_max() is used we have the
test_thread_flag() definition available but not the one for
test_tsk_thread_flag().
Signed-off-by: David S. Miller <davem@davemloft.net>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/sparc/include/asm/processor_64.h | 4 | ||||
| -rw-r--r-- | arch/sparc/include/asm/uaccess.h | 2 |
2 files changed, 4 insertions, 2 deletions
diff --git a/arch/sparc/include/asm/processor_64.h b/arch/sparc/include/asm/processor_64.h index e713db249931..6ca7709971d2 100644 --- a/arch/sparc/include/asm/processor_64.h +++ b/arch/sparc/include/asm/processor_64.h @@ -42,7 +42,9 @@ #define TASK_SIZE_OF(tsk) \ (test_tsk_thread_flag(tsk,TIF_32BIT) ? \ (1UL << 32UL) : ((unsigned long)-VPTE_SIZE)) -#define TASK_SIZE TASK_SIZE_OF(current) +#define TASK_SIZE \ + (test_thread_flag(TIF_32BIT) ? \ + (1UL << 32UL) : ((unsigned long)-VPTE_SIZE)) #ifdef __KERNEL__ #define STACK_TOP32 ((1UL << 32UL) - PAGE_SIZE) diff --git a/arch/sparc/include/asm/uaccess.h b/arch/sparc/include/asm/uaccess.h index 20c2acb06332..0167d26d0d1d 100644 --- a/arch/sparc/include/asm/uaccess.h +++ b/arch/sparc/include/asm/uaccess.h @@ -7,7 +7,7 @@ #endif #define user_addr_max() \ - (segment_eq(get_fs(), USER_DS) ? STACK_TOP : ~0UL) + (segment_eq(get_fs(), USER_DS) ? TASK_SIZE : ~0UL) extern long strncpy_from_user(char *dest, const char __user *src, long count); |