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uaccess: Provide put/get_user_inline()

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Provide convenience wrappers around scoped user access similar to
put/get_user(), which reduce the usage sites to:

       if (!get_user_inline(val, ptr))
       		return -EFAULT;

Should only be used if there is a demonstrable performance benefit.

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Ingo Molnar <mingo@kernel.org>
Reviewed-by: Mathieu Desnoyers <mathieu.desnoyers@efficios.com>
Link: https://patch.msgid.link/20251027083745.609031602@linutronix.de
This commit is contained in:
Thomas Gleixner
2025-10-27 09:43:56 +01:00
committed by Ingo Molnar
parent e497310b4f
commit b2cfc0cd68
1 changed files with 50 additions and 0 deletions
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50
include/linux/uaccess.h
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@@ -825,6 +825,56 @@ for (bool done = false; !done; done = true) \
#define scoped_user_rw_access(uptr, elbl) \
scoped_user_rw_access_size(uptr, sizeof(*(uptr)), elbl)
/**
* get_user_inline - Read user data inlined
* @val: The variable to store the value read from user memory
* @usrc: Pointer to the user space memory to read from
*
* Return: 0 if successful, -EFAULT when faulted
*
* Inlined variant of get_user(). Only use when there is a demonstrable
* performance reason.
*/
#define get_user_inline(val, usrc) \
({ \
__label__ efault; \
typeof(usrc) _tmpsrc = usrc; \
int _ret = 0; \
\
scoped_user_read_access(_tmpsrc, efault) \
unsafe_get_user(val, _tmpsrc, efault); \
if (0) { \
efault: \
_ret = -EFAULT; \
} \
_ret; \
})
/**
* put_user_inline - Write to user memory inlined
* @val: The value to write
* @udst: Pointer to the user space memory to write to
*
* Return: 0 if successful, -EFAULT when faulted
*
* Inlined variant of put_user(). Only use when there is a demonstrable
* performance reason.
*/
#define put_user_inline(val, udst) \
({ \
__label__ efault; \
typeof(udst) _tmpdst = udst; \
int _ret = 0; \
\
scoped_user_write_access(_tmpdst, efault) \
unsafe_put_user(val, _tmpdst, efault); \
if (0) { \
efault: \
_ret = -EFAULT; \
} \
_ret; \
})
#ifdef CONFIG_HARDENED_USERCOPY
void __noreturn usercopy_abort(const char *name, const char *detail,
bool to_user, unsigned long offset,