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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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10
arch/arm/lib/uaccess_with_memcpy.c
View file

@ -92,11 +92,6 @@ __copy_to_user_memcpy(void __user *to, const void *from, unsigned long n)
unsigned long ua_flags;
int atomic;
if (uaccess_kernel()) {
memcpy((void *)to, from, n);
return 0;
}
/* the mmap semaphore is taken only if not in an atomic context */
atomic = faulthandler_disabled();
@ -165,11 +160,6 @@ __clear_user_memset(void __user *addr, unsigned long n)
{
unsigned long ua_flags;
if (uaccess_kernel()) {
memset((void *)addr, 0, n);
return 0;
}
mmap_read_lock(current->mm);
while (n) {
pte_t *pte;