diff options
Diffstat (limited to 'patches/source/linux-2.6.33.4/kernel.CVE-2010-3301.b.diff')
| -rw-r--r-- | patches/source/linux-2.6.33.4/kernel.CVE-2010-3301.b.diff | 49 |
1 files changed, 49 insertions, 0 deletions
diff --git a/patches/source/linux-2.6.33.4/kernel.CVE-2010-3301.b.diff b/patches/source/linux-2.6.33.4/kernel.CVE-2010-3301.b.diff new file mode 100644 index 00000000..d8f209ca --- /dev/null +++ b/patches/source/linux-2.6.33.4/kernel.CVE-2010-3301.b.diff @@ -0,0 +1,49 @@ +From eefdca043e8391dcd719711716492063030b55ac Mon Sep 17 00:00:00 2001 +From: Roland McGrath <roland@redhat.com> +Date: Tue, 14 Sep 2010 12:22:58 -0700 +Subject: [PATCH] x86-64, compat: Retruncate rax after ia32 syscall entry tracing + +In commit d4d6715, we reopened an old hole for a 64-bit ptracer touching a +32-bit tracee in system call entry. A %rax value set via ptrace at the +entry tracing stop gets used whole as a 32-bit syscall number, while we +only check the low 32 bits for validity. + +Fix it by truncating %rax back to 32 bits after syscall_trace_enter, +in addition to testing the full 64 bits as has already been added. + +Reported-by: Ben Hawkes <hawkes@sota.gen.nz> +Signed-off-by: Roland McGrath <roland@redhat.com> +Signed-off-by: H. Peter Anvin <hpa@linux.intel.com> +--- + arch/x86/ia32/ia32entry.S | 8 +++++++- + 1 files changed, 7 insertions(+), 1 deletions(-) + +diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S +index 84e3a4e..518bb99 100644 +--- a/arch/x86/ia32/ia32entry.S ++++ b/arch/x86/ia32/ia32entry.S +@@ -50,7 +50,12 @@ + /* + * Reload arg registers from stack in case ptrace changed them. + * We don't reload %eax because syscall_trace_enter() returned +- * the value it wants us to use in the table lookup. ++ * the %rax value we should see. Instead, we just truncate that ++ * value to 32 bits again as we did on entry from user mode. ++ * If it's a new value set by user_regset during entry tracing, ++ * this matches the normal truncation of the user-mode value. ++ * If it's -1 to make us punt the syscall, then (u32)-1 is still ++ * an appropriately invalid value. + */ + .macro LOAD_ARGS32 offset, _r9=0 + .if \_r9 +@@ -60,6 +65,7 @@ + movl \offset+48(%rsp),%edx + movl \offset+56(%rsp),%esi + movl \offset+64(%rsp),%edi ++ movl %eax,%eax /* zero extension */ + .endm + + .macro CFI_STARTPROC32 simple +-- +1.7.3 + |