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| author |   Roland McGrath <roland@redhat.com> | 2007-11-06 15:30:38 -0800 |
|---|---|---|
| committer |   Thomas Gleixner <tglx@apollo.(none)> | 2007-11-10 04:30:36 +0100 |
| commit | fd181c72a3c202a3986bcee7551c0838265aec2a (patch) | |
| tree | b07b0a662baaace2c5addfca77b537e1267e8d12 /arch | |
| parent | voyager: use struct instead of PARAM (diff) | |
| download | linux-dev-fd181c72a3c202a3986bcee7551c0838265aec2a.tar.xz linux-dev-fd181c72a3c202a3986bcee7551c0838265aec2a.zip | |
x86_64: ia32 ptrace THREAD_AREA fix
The addr argument to PTRACE_GET_THREAD_AREA and PTRACE_SET_THREAD_AREA is
not a magic constant. It's derived from the segment register values being
used, which are computed originally from the index used with set_thread_area.
The value does not need to match what a native i386 kernel would accept.
It needs to match the segment selectors that can actually be in use in this
32-bit process. The 64-bit ptrace support for PTRACE_GET_THREAD_AREA
(normally used only on 32-bit processes) is correct, but the 32-bit emulation
of ptrace is broken.
Signed-off-by: Roland McGrath <roland@redhat.com>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Diffstat (limited to 'arch')
| -rw-r--r-- | arch/x86/ia32/ptrace32.c | 10 |
1 files changed, 2 insertions, 8 deletions
diff --git a/arch/x86/ia32/ptrace32.c b/arch/x86/ia32/ptrace32.c index f52770ef0ee3..4a233ad6269c 100644 --- a/arch/x86/ia32/ptrace32.c +++ b/arch/x86/ia32/ptrace32.c @@ -228,8 +228,6 @@ static long ptrace32_siginfo(unsigned request, u32 pid, u32 addr, u32 data) return ret; } -#define COMPAT_GDT_ENTRY_TLS_MIN 6 - asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data) { struct task_struct *child; @@ -248,6 +246,8 @@ asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data) case PTRACE_SYSCALL: case PTRACE_OLDSETOPTIONS: case PTRACE_SETOPTIONS: + case PTRACE_SET_THREAD_AREA: + case PTRACE_GET_THREAD_AREA: return sys_ptrace(request, pid, addr, data); default: @@ -271,12 +271,6 @@ asmlinkage long sys32_ptrace(long request, u32 pid, u32 addr, u32 data) case PTRACE_SETSIGINFO: case PTRACE_GETSIGINFO: return ptrace32_siginfo(request, pid, addr, data); - - case PTRACE_SET_THREAD_AREA: - case PTRACE_GET_THREAD_AREA: - return sys_ptrace(request, pid, - addr + GDT_ENTRY_TLS_MIN - COMPAT_GDT_ENTRY_TLS_MIN, - data); } child = ptrace_get_task_struct(pid); |