DR6_RESERVED and DR_CONTROL_RESERVED are used to clear the set
bits in the "unsigned long" data, make them long to ensure that
"&~" doesn't clear the upper bits.
This is only cleanup, the usage of ~DR*_RESERVED is safe but
doesn't look clean and the pattern is error prone.
- do_debug:
dr6 &= ~DR6_RESERVED;
this also wrongly clears 32-63 bits. Fortunately these
bits are reserved and must be zero.
- ptrace_write_dr7:
data &= ~DR_CONTROL_RESERVED;
on __i386__ this mixes long/int but sizeof should be the
same.
Reported-by: Linus Torvalds <torvalds@xxxxxxxxxxxxxxxxxxxx>
Signed-off-by: Oleg Nesterov <oleg@xxxxxxxxxx>
---
arch/x86/include/uapi/asm/debugreg.h | 4 ++--
1 files changed, 2 insertions(+), 2 deletions(-)
diff --git a/arch/x86/include/uapi/asm/debugreg.h b/arch/x86/include/uapi/asm/debugreg.h
index 3c0874d..c0c1b89 100644
--- a/arch/x86/include/uapi/asm/debugreg.h
+++ b/arch/x86/include/uapi/asm/debugreg.h
@@ -15,7 +15,7 @@
are either reserved or not of interest to us. */
/* Define reserved bits in DR6 which are always set to 1 */
-#define DR6_RESERVED (0xFFFF0FF0)
+#define DR6_RESERVED (0xFFFF0FF0UL)
#define DR_TRAP0 (0x1) /* db0 */
#define DR_TRAP1 (0x2) /* db1 */
@@ -65,7 +65,7 @@
gdt or the ldt if we want to. I am not sure why this is an advantage */
#ifdef __i386__
-#define DR_CONTROL_RESERVED (0xFC00) /* Reserved by Intel */
+#define DR_CONTROL_RESERVED (0xFC00UL) /* Reserved by Intel */
#else
#define DR_CONTROL_RESERVED (0xFFFFFFFF0000FC00UL) /* Reserved */
#endif
--
1.5.5.1
--
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