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uaccess: remove CONFIG_SET_FS

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There are no remaining callers of set_fs(), so CONFIG_SET_FS
can be removed globally, along with the thread_info field and
any references to it.

This turns access_ok() into a cheaper check against TASK_SIZE_MAX.

As CONFIG_SET_FS is now gone, drop all remaining references to
set_fs()/get_fs(), mm_segment_t, user_addr_max() and uaccess_kernel().

Acked-by: Sam Ravnborg <sam@ravnborg.org> # for sparc32 changes
Acked-by: "Eric W. Biederman" <ebiederm@xmission.com>
Tested-by: Sergey Matyukevich <sergey.matyukevich@synopsys.com> # for arc changes
Acked-by: Stafford Horne <shorne@gmail.com> # [openrisc, asm-generic]
Acked-by: Dinh Nguyen <dinguyen@kernel.org>
Signed-off-by: Arnd Bergmann <arnd@arndb.de>
This commit is contained in:
Arnd Bergmann
2022-02-11 21:42:45 +01:00
parent e5ef21d139
commit 967747bbc0
76 changed files with 14 additions and 531 deletions
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33
include/linux/uaccess.h
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@@ -10,39 +10,6 @@
#include <asm/uaccess.h>
#ifdef CONFIG_SET_FS
/*
* Force the uaccess routines to be wired up for actual userspace access,
* overriding any possible set_fs(KERNEL_DS) still lingering around. Undone
* using force_uaccess_end below.
*/
static inline mm_segment_t force_uaccess_begin(void)
{
mm_segment_t fs = get_fs();
set_fs(USER_DS);
return fs;
}
static inline void force_uaccess_end(mm_segment_t oldfs)
{
set_fs(oldfs);
}
#else /* CONFIG_SET_FS */
typedef struct {
/* empty dummy */
} mm_segment_t;
static inline mm_segment_t force_uaccess_begin(void)
{
return (mm_segment_t) { };
}
static inline void force_uaccess_end(mm_segment_t oldfs)
{
}
#endif /* CONFIG_SET_FS */
/*
* Architectures should provide two primitives (raw_copy_{to,from}_user())
* and get rid of their private instances of copy_{to,from}_user() and