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x86 user stack frame reads: switch to explicit __get_user()

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rather than relying upon the magic in raw_copy_from_user()

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro
2020-02-15 11:28:09 -05:00
parent bb6d3fb354
commit c8e3dd8660
3 changed files with 11 additions and 31 deletions
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9
arch/x86/include/asm/uaccess.h
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@@ -694,15 +694,6 @@ extern struct movsl_mask {
# include <asm/uaccess_64.h>
#endif
/*
* We rely on the nested NMI work to allow atomic faults from the NMI path; the
* nested NMI paths are careful to preserve CR2.
*
* Caller must use pagefault_enable/disable, or run in interrupt context,
* and also do a uaccess_ok() check
*/
#define __copy_from_user_nmi __copy_from_user_inatomic
/*
* The "unsafe" user accesses aren't really "unsafe", but the naming
* is a big fat warning: you have to not only do the access_ok()