diff options
| author | Andrew Morton <akpm@osdl.org> | 2006-09-27 10:51:15 +0200 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-09-27 17:26:20 +0200 |
| commit | 1e2af92e089d4c845248844a3e7ee06ce889af46 (patch) | |
| tree | f5c995fa5b56cc3f7be030efe5ced10f0cbc70f9 /arch/i386/kernel/traps.c | |
| parent | [PATCH] add probe_kernel_address() (diff) | |
| download | linux-1e2af92e089d4c845248844a3e7ee06ce889af46.tar.xz linux-1e2af92e089d4c845248844a3e7ee06ce889af46.zip | |
[PATCH] x86: use probe_kernel_address in handle_BUG()
Avoid possible deadlock on a BUG() inside down_write(mmap_sem). The deadlock
can only occur if something has gone horridly wrong, because a fault here
shouldn't happen.
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'arch/i386/kernel/traps.c')
| -rw-r--r-- | arch/i386/kernel/traps.c | 7 |
1 files changed, 4 insertions, 3 deletions
diff --git a/arch/i386/kernel/traps.c b/arch/i386/kernel/traps.c index 21aa1cd57773..a13037fe0ee3 100644 --- a/arch/i386/kernel/traps.c +++ b/arch/i386/kernel/traps.c @@ -28,6 +28,7 @@ #include <linux/kprobes.h> #include <linux/kexec.h> #include <linux/unwind.h> +#include <linux/uaccess.h> #ifdef CONFIG_EISA #include <linux/ioport.h> @@ -40,7 +41,6 @@ #include <asm/processor.h> #include <asm/system.h> -#include <asm/uaccess.h> #include <asm/io.h> #include <asm/atomic.h> #include <asm/debugreg.h> @@ -409,7 +409,7 @@ static void handle_BUG(struct pt_regs *regs) if (eip < PAGE_OFFSET) return; - if (__get_user(ud2, (unsigned short __user *)eip)) + if (probe_kernel_address((unsigned short __user *)eip, ud2)) return; if (ud2 != 0x0b0f) return; @@ -422,7 +422,8 @@ static void handle_BUG(struct pt_regs *regs) char *file; char c; - if (__get_user(line, (unsigned short __user *)(eip + 2))) + if (probe_kernel_address((unsigned short __user *)(eip + 2), + line)) break; if (__get_user(file, (char * __user *)(eip + 4)) || (unsigned long)file < PAGE_OFFSET || __get_user(c, file)) |