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| author | Andi Kleen <ak@suse.de> | 2006-12-07 01:14:06 (GMT) |
|---|---|---|
| committer | Andi Kleen <andi@basil.nowhere.org> | 2006-12-07 01:14:06 (GMT) |
| commit | 11a4180c0b03e2ee0c948fd8430ee092dc1625b3 (patch) | |
| tree | c0f5018983f859d84b0832ea793ba0c49d344935 /arch/i386/mm | |
| parent | ab2bf0c1c689905b628dca94d0acd9c50e152468 (diff) | |
| download | linux-fsl-qoriq-11a4180c0b03e2ee0c948fd8430ee092dc1625b3.tar.xz | |
[PATCH] i386: Use probe_kernel_address instead of __get_user in fault paths
Makes the intention of the code cleaner to read and avoids
a potential deadlock on mmap_sem. Also change the types of
the arguments to not include __user because they're really
not user addresses.
Signed-off-by: Andi Kleen <ak@suse.de>
Diffstat (limited to 'arch/i386/mm')
| -rw-r--r-- | arch/i386/mm/fault.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/arch/i386/mm/fault.c b/arch/i386/mm/fault.c index 2581575..aaaa4d2 100644 --- a/arch/i386/mm/fault.c +++ b/arch/i386/mm/fault.c @@ -22,9 +22,9 @@ #include <linux/highmem.h> #include <linux/module.h> #include <linux/kprobes.h> +#include <linux/uaccess.h> #include <asm/system.h> -#include <asm/uaccess.h> #include <asm/desc.h> #include <asm/kdebug.h> #include <asm/segment.h> @@ -167,7 +167,7 @@ static inline unsigned long get_segment_eip(struct pt_regs *regs, static int __is_prefetch(struct pt_regs *regs, unsigned long addr) { unsigned long limit; - unsigned long instr = get_segment_eip (regs, &limit); + unsigned char *instr = (unsigned char *)get_segment_eip (regs, &limit); int scan_more = 1; int prefetch = 0; int i; @@ -177,9 +177,9 @@ static int __is_prefetch(struct pt_regs *regs, unsigned long addr) unsigned char instr_hi; unsigned char instr_lo; - if (instr > limit) + if (instr > (unsigned char *)limit) break; - if (__get_user(opcode, (unsigned char __user *) instr)) + if (probe_kernel_address(instr, opcode)) break; instr_hi = opcode & 0xf0; @@ -204,9 +204,9 @@ static int __is_prefetch(struct pt_regs *regs, unsigned long addr) case 0x00: /* Prefetch instruction is 0x0F0D or 0x0F18 */ scan_more = 0; - if (instr > limit) + if (instr > (unsigned char *)limit) break; - if (__get_user(opcode, (unsigned char __user *) instr)) + if (probe_kernel_address(instr, opcode)) break; prefetch = (instr_lo == 0xF) && (opcode == 0x0D || opcode == 0x18); |