Re: [PATCH 07/14] uaccess: generalize access_ok()
From: Al Viro <viro@zeniv.linux.org.uk>
Date: 2022-02-14 17:15:53
Also in:
linux-alpha, linux-api, linux-arch, linux-m68k, linux-mips, linux-mm, linux-riscv, linux-s390, linux-sh, linux-um, linuxppc-dev, sparclinux
On Mon, Feb 14, 2022 at 05:34:45PM +0100, Arnd Bergmann wrote:
quoted hunk ↗ jump to hunk
diff --git a/arch/csky/kernel/signal.c b/arch/csky/kernel/signal.c index c7b763d2f526..8867ddf3e6c7 100644 --- a/arch/csky/kernel/signal.c +++ b/arch/csky/kernel/signal.c@@ -136,7 +136,7 @@ static inline void __user *get_sigframe(struct ksignal *ksig, static int setup_rt_frame(struct ksignal *ksig, sigset_t *set, struct pt_regs *regs) { - struct rt_sigframe *frame; + struct rt_sigframe __user *frame; int err = 0; frame = get_sigframe(ksig, regs, sizeof(*frame));
Minor nit: might make sense to separate annotations (here, on nios2, etc.) from the rest... This, OTOH,
quoted hunk ↗ jump to hunk
diff --git a/arch/sparc/include/asm/uaccess_64.h b/arch/sparc/include/asm/uaccess_64.h index 5c12fb46bc61..000bac67cf31 100644 --- a/arch/sparc/include/asm/uaccess_64.h +++ b/arch/sparc/include/asm/uaccess_64.h
...
-static inline bool __chk_range_not_ok(unsigned long addr, unsigned long size, unsigned long limit)
-{
- if (__builtin_constant_p(size))
- return addr > limit - size;
-
- addr += size;
- if (addr < size)
- return true;
-
- return addr > limit;
-}
-
-#define __range_not_ok(addr, size, limit) \
-({ \
- __chk_user_ptr(addr); \
- __chk_range_not_ok((unsigned long __force)(addr), size, limit); \
-})
-
-static inline int __access_ok(const void __user * addr, unsigned long size)
-{
- return 1;
-}
-
-static inline int access_ok(const void __user * addr, unsigned long size)
-{
- return 1;
-}
+#define __range_not_ok(addr, size, limit) (!__access_ok(addr, size))is really wrong. For sparc64, access_ok() should always be true. This __range_not_ok() thing is used *only* for valid_user_frame() in arch/sparc/kernel/perf_event.c - it's not a part of normal access_ok() there. sparc64 has separate address spaces for kernel and for userland; access_ok() had never been useful there.