mirror of
https://github.com/torvalds/linux
synced 2024-09-06 09:51:23 +00:00
mm/uaccess, mm/fault: Clarify that uaccess may only sleep if pagefaults are enabled
In general, non-atomic variants of user access functions must not sleep if pagefaults are disabled. Let's update all relevant comments in uaccess code. This also reflects the might_sleep() checks in might_fault(). Reviewed-and-tested-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: David Hildenbrand <dahi@linux.vnet.ibm.com> Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org> Cc: David.Laight@ACULAB.COM Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: airlied@linux.ie Cc: akpm@linux-foundation.org Cc: benh@kernel.crashing.org Cc: bigeasy@linutronix.de Cc: borntraeger@de.ibm.com Cc: daniel.vetter@intel.com Cc: heiko.carstens@de.ibm.com Cc: herbert@gondor.apana.org.au Cc: hocko@suse.cz Cc: hughd@google.com Cc: mst@redhat.com Cc: paulus@samba.org Cc: ralf@linux-mips.org Cc: schwidefsky@de.ibm.com Cc: yang.shi@windriver.com Link: http://lkml.kernel.org/r/1431359540-32227-4-git-send-email-dahi@linux.vnet.ibm.com Signed-off-by: Ingo Molnar <mingo@kernel.org>
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@ -97,7 +97,8 @@ static inline __kernel_size_t __copy_from_user(void *to,
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* @x: Value to copy to user space.
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* @ptr: Destination address, in user space.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple value from kernel space to user
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* space. It supports simple types like char and int, but not larger
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@ -116,7 +117,8 @@ static inline __kernel_size_t __copy_from_user(void *to,
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* @x: Variable to store result.
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* @ptr: Source address, in user space.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple variable from user space to kernel
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* space. It supports simple types like char and int, but not larger
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@ -136,7 +138,8 @@ static inline __kernel_size_t __copy_from_user(void *to,
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* @x: Value to copy to user space.
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* @ptr: Destination address, in user space.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple value from kernel space to user
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* space. It supports simple types like char and int, but not larger
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@ -158,7 +161,8 @@ static inline __kernel_size_t __copy_from_user(void *to,
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* @x: Variable to store result.
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* @ptr: Source address, in user space.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple variable from user space to kernel
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* space. It supports simple types like char and int, but not larger
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@ -36,7 +36,8 @@
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* @addr: User space pointer to start of block to check
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* @size: Size of block to check
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* Checks if a pointer to a block of memory in user space is valid.
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*
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@ -91,7 +91,8 @@ static inline void set_fs(mm_segment_t s)
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* @addr: User space pointer to start of block to check
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* @size: Size of block to check
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* Checks if a pointer to a block of memory in user space is valid.
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*
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@ -155,7 +156,8 @@ extern int fixup_exception(struct pt_regs *regs);
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* @x: Variable to store result.
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* @ptr: Source address, in user space.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple variable from user space to kernel
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* space. It supports simple types like char and int, but not larger
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@ -175,7 +177,8 @@ extern int fixup_exception(struct pt_regs *regs);
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* @x: Value to copy to user space.
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* @ptr: Destination address, in user space.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple value from kernel space to user
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* space. It supports simple types like char and int, but not larger
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@ -194,7 +197,8 @@ extern int fixup_exception(struct pt_regs *regs);
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* @x: Variable to store result.
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* @ptr: Source address, in user space.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple variable from user space to kernel
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* space. It supports simple types like char and int, but not larger
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@ -274,7 +278,8 @@ do { \
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* @x: Value to copy to user space.
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* @ptr: Destination address, in user space.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple value from kernel space to user
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* space. It supports simple types like char and int, but not larger
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@ -568,7 +573,8 @@ unsigned long __generic_copy_from_user(void *, const void __user *, unsigned lon
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* @from: Source address, in kernel space.
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* @n: Number of bytes to copy.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* Copy data from kernel space to user space. Caller must check
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* the specified block with access_ok() before calling this function.
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@ -588,7 +594,8 @@ unsigned long __generic_copy_from_user(void *, const void __user *, unsigned lon
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* @from: Source address, in kernel space.
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* @n: Number of bytes to copy.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* Copy data from kernel space to user space.
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*
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@ -606,7 +613,8 @@ unsigned long __generic_copy_from_user(void *, const void __user *, unsigned lon
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* @from: Source address, in user space.
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* @n: Number of bytes to copy.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* Copy data from user space to kernel space. Caller must check
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* the specified block with access_ok() before calling this function.
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@ -626,7 +634,8 @@ unsigned long __generic_copy_from_user(void *, const void __user *, unsigned lon
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* @from: Source address, in user space.
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* @n: Number of bytes to copy.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* Copy data from user space to kernel space.
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*
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@ -677,7 +686,8 @@ unsigned long clear_user(void __user *mem, unsigned long len);
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* strlen_user: - Get the size of a string in user space.
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* @str: The string to measure.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* Get the size of a NUL-terminated string in user space.
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*
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@ -178,7 +178,8 @@ extern long __user_bad(void);
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* @x: Variable to store result.
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* @ptr: Source address, in user space.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple variable from user space to kernel
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* space. It supports simple types like char and int, but not larger
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@ -290,7 +291,8 @@ extern long __user_bad(void);
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* @x: Value to copy to user space.
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* @ptr: Destination address, in user space.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple value from kernel space to user
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* space. It supports simple types like char and int, but not larger
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@ -103,7 +103,8 @@ extern u64 __ua_limit;
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* @addr: User space pointer to start of block to check
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* @size: Size of block to check
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* Checks if a pointer to a block of memory in user space is valid.
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*
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@ -138,7 +139,8 @@ extern u64 __ua_limit;
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* @x: Value to copy to user space.
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* @ptr: Destination address, in user space.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple value from kernel space to user
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* space. It supports simple types like char and int, but not larger
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@ -157,7 +159,8 @@ extern u64 __ua_limit;
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* @x: Variable to store result.
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* @ptr: Source address, in user space.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple variable from user space to kernel
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* space. It supports simple types like char and int, but not larger
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@ -177,7 +180,8 @@ extern u64 __ua_limit;
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* @x: Value to copy to user space.
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* @ptr: Destination address, in user space.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple value from kernel space to user
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* space. It supports simple types like char and int, but not larger
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@ -199,7 +203,8 @@ extern u64 __ua_limit;
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* @x: Variable to store result.
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* @ptr: Source address, in user space.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple variable from user space to kernel
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* space. It supports simple types like char and int, but not larger
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@ -498,7 +503,8 @@ extern void __put_user_unknown(void);
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* @x: Value to copy to user space.
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* @ptr: Destination address, in user space.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple value from kernel space to user
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* space. It supports simple types like char and int, but not larger
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* @x: Variable to store result.
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* @ptr: Source address, in user space.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple variable from user space to kernel
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* space. It supports simple types like char and int, but not larger
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* @x: Value to copy to user space.
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* @ptr: Destination address, in user space.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple value from kernel space to user
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* space. It supports simple types like char and int, but not larger
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@ -559,7 +567,8 @@ extern void __put_user_unknown(void);
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* @x: Variable to store result.
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* @ptr: Source address, in user space.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* This macro copies a single simple variable from user space to kernel
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* space. It supports simple types like char and int, but not larger
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@ -815,7 +824,8 @@ extern size_t __copy_user(void *__to, const void *__from, size_t __n);
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* @from: Source address, in kernel space.
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* @n: Number of bytes to copy.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* Copy data from kernel space to user space. Caller must check
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* the specified block with access_ok() before calling this function.
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@ -888,7 +898,8 @@ extern size_t __copy_user_inatomic(void *__to, const void *__from, size_t __n);
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* @from: Source address, in kernel space.
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* @n: Number of bytes to copy.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* Copy data from kernel space to user space.
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*
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@ -1075,7 +1086,8 @@ extern size_t __copy_in_user_eva(void *__to, const void *__from, size_t __n);
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* @from: Source address, in user space.
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* @n: Number of bytes to copy.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* Copy data from user space to kernel space. Caller must check
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* the specified block with access_ok() before calling this function.
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@ -1107,7 +1119,8 @@ extern size_t __copy_in_user_eva(void *__to, const void *__from, size_t __n);
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* @from: Source address, in user space.
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* @n: Number of bytes to copy.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* Copy data from user space to kernel space.
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*
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* strlen_user: - Get the size of a string in user space.
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* @str: The string to measure.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* Get the size of a NUL-terminated string in user space.
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*
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* strnlen_user: - Get the size of a string in user space.
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* @str: The string to measure.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* Get the size of a NUL-terminated string in user space.
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*
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* @from: Source address, in user space.
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* @n: Number of bytes to copy.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* Copy data from user space to kernel space. Caller must check
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* the specified block with access_ok() before calling this function.
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* @from: Source address, in kernel space.
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* @n: Number of bytes to copy.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* Copy data from kernel space to user space. Caller must check
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* the specified block with access_ok() before calling this function.
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* @from: Source address, in kernel space.
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* @n: Number of bytes to copy.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* Copy data from kernel space to user space.
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*
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* @from: Source address, in user space.
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* @n: Number of bytes to copy.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* Copy data from user space to kernel space.
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*
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* strlen_user: - Get the size of a string in user space.
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* @str: The string to measure.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* Get the size of a NUL-terminated string in user space.
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*
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* @addr: User space pointer to start of block to check
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* @size: Size of block to check
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
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* Checks if a pointer to a block of memory in user space is valid.
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*
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* @x: Value to copy to user space.
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* @ptr: Destination address, in user space.
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*
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* Context: User context only. This function may sleep.
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* Context: User context only. This function may sleep if pagefaults are
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* enabled.
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*
|
||||
* This macro copies a single simple value from kernel space to user
|
||||
* space. It supports simple types like char and int, but not larger
|
||||
|
@ -79,7 +81,8 @@
|
|||
* @x: Variable to store result.
|
||||
* @ptr: Source address, in user space.
|
||||
*
|
||||
* Context: User context only. This function may sleep.
|
||||
* Context: User context only. This function may sleep if pagefaults are
|
||||
* enabled.
|
||||
*
|
||||
* This macro copies a single simple variable from user space to kernel
|
||||
* space. It supports simple types like char and int, but not larger
|
||||
|
@ -98,7 +101,8 @@
|
|||
* @x: Value to copy to user space.
|
||||
* @ptr: Destination address, in user space.
|
||||
*
|
||||
* Context: User context only. This function may sleep.
|
||||
* Context: User context only. This function may sleep if pagefaults are
|
||||
* enabled.
|
||||
*
|
||||
* This macro copies a single simple value from kernel space to user
|
||||
* space. It supports simple types like char and int, but not larger
|
||||
|
@ -119,7 +123,8 @@
|
|||
* @x: Variable to store result.
|
||||
* @ptr: Source address, in user space.
|
||||
*
|
||||
* Context: User context only. This function may sleep.
|
||||
* Context: User context only. This function may sleep if pagefaults are
|
||||
* enabled.
|
||||
*
|
||||
* This macro copies a single simple variable from user space to kernel
|
||||
* space. It supports simple types like char and int, but not larger
|
||||
|
|
|
@ -78,7 +78,8 @@ int __range_ok(unsigned long addr, unsigned long size);
|
|||
* @addr: User space pointer to start of block to check
|
||||
* @size: Size of block to check
|
||||
*
|
||||
* Context: User context only. This function may sleep.
|
||||
* Context: User context only. This function may sleep if pagefaults are
|
||||
* enabled.
|
||||
*
|
||||
* Checks if a pointer to a block of memory in user space is valid.
|
||||
*
|
||||
|
@ -192,7 +193,8 @@ extern int __get_user_bad(void)
|
|||
* @x: Variable to store result.
|
||||
* @ptr: Source address, in user space.
|
||||
*
|
||||
* Context: User context only. This function may sleep.
|
||||
* Context: User context only. This function may sleep if pagefaults are
|
||||
* enabled.
|
||||
*
|
||||
* This macro copies a single simple variable from user space to kernel
|
||||
* space. It supports simple types like char and int, but not larger
|
||||
|
@ -274,7 +276,8 @@ extern int __put_user_bad(void)
|
|||
* @x: Value to copy to user space.
|
||||
* @ptr: Destination address, in user space.
|
||||
*
|
||||
* Context: User context only. This function may sleep.
|
||||
* Context: User context only. This function may sleep if pagefaults are
|
||||
* enabled.
|
||||
*
|
||||
* This macro copies a single simple value from kernel space to user
|
||||
* space. It supports simple types like char and int, but not larger
|
||||
|
@ -330,7 +333,8 @@ extern int __put_user_bad(void)
|
|||
* @from: Source address, in kernel space.
|
||||
* @n: Number of bytes to copy.
|
||||
*
|
||||
* Context: User context only. This function may sleep.
|
||||
* Context: User context only. This function may sleep if pagefaults are
|
||||
* enabled.
|
||||
*
|
||||
* Copy data from kernel space to user space. Caller must check
|
||||
* the specified block with access_ok() before calling this function.
|
||||
|
@ -366,7 +370,8 @@ copy_to_user(void __user *to, const void *from, unsigned long n)
|
|||
* @from: Source address, in user space.
|
||||
* @n: Number of bytes to copy.
|
||||
*
|
||||
* Context: User context only. This function may sleep.
|
||||
* Context: User context only. This function may sleep if pagefaults are
|
||||
* enabled.
|
||||
*
|
||||
* Copy data from user space to kernel space. Caller must check
|
||||
* the specified block with access_ok() before calling this function.
|
||||
|
@ -437,7 +442,8 @@ static inline unsigned long __must_check copy_from_user(void *to,
|
|||
* @from: Source address, in user space.
|
||||
* @n: Number of bytes to copy.
|
||||
*
|
||||
* Context: User context only. This function may sleep.
|
||||
* Context: User context only. This function may sleep if pagefaults are
|
||||
* enabled.
|
||||
*
|
||||
* Copy data from user space to user space. Caller must check
|
||||
* the specified blocks with access_ok() before calling this function.
|
||||
|
|
|
@ -74,7 +74,8 @@ static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, un
|
|||
* @addr: User space pointer to start of block to check
|
||||
* @size: Size of block to check
|
||||
*
|
||||
* Context: User context only. This function may sleep.
|
||||
* Context: User context only. This function may sleep if pagefaults are
|
||||
* enabled.
|
||||
*
|
||||
* Checks if a pointer to a block of memory in user space is valid.
|
||||
*
|
||||
|
@ -145,7 +146,8 @@ __typeof__(__builtin_choose_expr(sizeof(x) > sizeof(0UL), 0ULL, 0UL))
|
|||
* @x: Variable to store result.
|
||||
* @ptr: Source address, in user space.
|
||||
*
|
||||
* Context: User context only. This function may sleep.
|
||||
* Context: User context only. This function may sleep if pagefaults are
|
||||
* enabled.
|
||||
*
|
||||
* This macro copies a single simple variable from user space to kernel
|
||||
* space. It supports simple types like char and int, but not larger
|
||||
|
@ -240,7 +242,8 @@ extern void __put_user_8(void);
|
|||
* @x: Value to copy to user space.
|
||||
* @ptr: Destination address, in user space.
|
||||
*
|
||||
* Context: User context only. This function may sleep.
|
||||
* Context: User context only. This function may sleep if pagefaults are
|
||||
* enabled.
|
||||
*
|
||||
* This macro copies a single simple value from kernel space to user
|
||||
* space. It supports simple types like char and int, but not larger
|
||||
|
@ -455,7 +458,8 @@ struct __large_struct { unsigned long buf[100]; };
|
|||
* @x: Variable to store result.
|
||||
* @ptr: Source address, in user space.
|
||||
*
|
||||
* Context: User context only. This function may sleep.
|
||||
* Context: User context only. This function may sleep if pagefaults are
|
||||
* enabled.
|
||||
*
|
||||
* This macro copies a single simple variable from user space to kernel
|
||||
* space. It supports simple types like char and int, but not larger
|
||||
|
@ -479,7 +483,8 @@ struct __large_struct { unsigned long buf[100]; };
|
|||
* @x: Value to copy to user space.
|
||||
* @ptr: Destination address, in user space.
|
||||
*
|
||||
* Context: User context only. This function may sleep.
|
||||
* Context: User context only. This function may sleep if pagefaults are
|
||||
* enabled.
|
||||
*
|
||||
* This macro copies a single simple value from kernel space to user
|
||||
* space. It supports simple types like char and int, but not larger
|
||||
|
|
|
@ -70,7 +70,8 @@ __copy_to_user_inatomic(void __user *to, const void *from, unsigned long n)
|
|||
* @from: Source address, in kernel space.
|
||||
* @n: Number of bytes to copy.
|
||||
*
|
||||
* Context: User context only. This function may sleep.
|
||||
* Context: User context only. This function may sleep if pagefaults are
|
||||
* enabled.
|
||||
*
|
||||
* Copy data from kernel space to user space. Caller must check
|
||||
* the specified block with access_ok() before calling this function.
|
||||
|
@ -117,7 +118,8 @@ __copy_from_user_inatomic(void *to, const void __user *from, unsigned long n)
|
|||
* @from: Source address, in user space.
|
||||
* @n: Number of bytes to copy.
|
||||
*
|
||||
* Context: User context only. This function may sleep.
|
||||
* Context: User context only. This function may sleep if pagefaults are
|
||||
* enabled.
|
||||
*
|
||||
* Copy data from user space to kernel space. Caller must check
|
||||
* the specified block with access_ok() before calling this function.
|
||||
|
|
|
@ -647,7 +647,8 @@ EXPORT_SYMBOL(__copy_from_user_ll_nocache_nozero);
|
|||
* @from: Source address, in kernel space.
|
||||
* @n: Number of bytes to copy.
|
||||
*
|
||||
* Context: User context only. This function may sleep.
|
||||
* Context: User context only. This function may sleep if pagefaults are
|
||||
* enabled.
|
||||
*
|
||||
* Copy data from kernel space to user space.
|
||||
*
|
||||
|
@ -668,7 +669,8 @@ EXPORT_SYMBOL(_copy_to_user);
|
|||
* @from: Source address, in user space.
|
||||
* @n: Number of bytes to copy.
|
||||
*
|
||||
* Context: User context only. This function may sleep.
|
||||
* Context: User context only. This function may sleep if pagefaults are
|
||||
* enabled.
|
||||
*
|
||||
* Copy data from user space to kernel space.
|
||||
*
|
||||
|
|
|
@ -84,7 +84,8 @@ static inline long do_strnlen_user(const char __user *src, unsigned long count,
|
|||
* @str: The string to measure.
|
||||
* @count: Maximum count (including NUL character)
|
||||
*
|
||||
* Context: User context only. This function may sleep.
|
||||
* Context: User context only. This function may sleep if pagefaults are
|
||||
* enabled.
|
||||
*
|
||||
* Get the size of a NUL-terminated string in user space.
|
||||
*
|
||||
|
@ -113,7 +114,8 @@ EXPORT_SYMBOL(strnlen_user);
|
|||
* strlen_user: - Get the size of a user string INCLUDING final NUL.
|
||||
* @str: The string to measure.
|
||||
*
|
||||
* Context: User context only. This function may sleep.
|
||||
* Context: User context only. This function may sleep if pagefaults are
|
||||
* enabled.
|
||||
*
|
||||
* Get the size of a NUL-terminated string in user space.
|
||||
*
|
||||
|
|
Loading…
Reference in a new issue