diff options
| author | Steve French <sfrench@us.ibm.com> | 2006-03-31 03:35:56 +0000 |
|---|---|---|
| committer | Steve French <sfrench@us.ibm.com> | 2006-03-31 03:35:56 +0000 |
| commit | d62e54abca1146981fc9f98f85ff398a113a22c2 (patch) | |
| tree | 870420dbc4c65e716dcef8a802aafdc0ef97a8b4 /arch/um/sys-i386/ptrace.c | |
| parent | fd4a0b92db6a57cba8d03efbe1cebf91f9124ce0 (diff) | |
| parent | ce362c009250340358a7221f3cdb7954cbf19c01 (diff) | |
Merge with /pub/scm/linux/kernel/git/torvalds/linux-2.6.git
Signed-off-by: Steve French <sfrench@us.ibm.com>
Diffstat (limited to 'arch/um/sys-i386/ptrace.c')
| -rw-r--r-- | arch/um/sys-i386/ptrace.c | 15 |
1 files changed, 12 insertions, 3 deletions
diff --git a/arch/um/sys-i386/ptrace.c b/arch/um/sys-i386/ptrace.c index e839ce65ad28..8032a105949a 100644 --- a/arch/um/sys-i386/ptrace.c +++ b/arch/um/sys-i386/ptrace.c @@ -6,6 +6,7 @@ #include <linux/config.h> #include <linux/compiler.h> #include "linux/sched.h" +#include "linux/mm.h" #include "asm/elf.h" #include "asm/ptrace.h" #include "asm/uaccess.h" @@ -26,9 +27,17 @@ int is_syscall(unsigned long addr) n = copy_from_user(&instr, (void __user *) addr, sizeof(instr)); if(n){ - printk("is_syscall : failed to read instruction from 0x%lx\n", - addr); - return(0); + /* access_process_vm() grants access to vsyscall and stub, + * while copy_from_user doesn't. Maybe access_process_vm is + * slow, but that doesn't matter, since it will be called only + * in case of singlestepping, if copy_from_user failed. + */ + n = access_process_vm(current, addr, &instr, sizeof(instr), 0); + if(n != sizeof(instr)) { + printk("is_syscall : failed to read instruction from " + "0x%lx\n", addr); + return(1); + } } /* int 0x80 or sysenter */ return((instr == 0x80cd) || (instr == 0x340f)); |