diff options
Diffstat (limited to '03-compat-retruncate-rax-after-ia32-syscall-entry-tracing.patch')
| -rw-r--r-- | 03-compat-retruncate-rax-after-ia32-syscall-entry-tracing.patch | 49 |
1 files changed, 0 insertions, 49 deletions
diff --git a/03-compat-retruncate-rax-after-ia32-syscall-entry-tracing.patch b/03-compat-retruncate-rax-after-ia32-syscall-entry-tracing.patch deleted file mode 100644 index 96c269b..0000000 --- a/03-compat-retruncate-rax-after-ia32-syscall-entry-tracing.patch +++ /dev/null @@ -1,49 +0,0 @@ -From 1fa16daaa76d1b132c8fee027c11bad5a5d25761 Mon Sep 17 00:00:00 2001 -From: Roland McGrath <roland@redhat.com> -Date: Tue, 14 Sep 2010 12:22:58 -0700 -Subject: [PATCH 3/4] 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 7f9eb54..4edd8eb 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 --- -1.7.2.3 - |