Author: kib
Date: Thu Jan 27 21:45:38 2011
New Revision: 217991
URL: http://svn.freebsd.org/changeset/base/217991
Log:
linux_sigreturn() loads the struct trapframe from l_sigcontext
members, thus making a signed extension of 32 bit register
context. If the register is not touched in usermode between
return from signal and next syscall entry, the sign-extension
part of 64bit register is not cleared, causing
linux32_fetch_syscall_args() to read wrong values.
Use unsigned type for the registers in the linux sigcontext.
Reported by: Jacob Frelinger <jacob.frelinger duke edu>, arundel
In collaboration with: dchagin
MFC after: 1 week
Modified:
head/sys/amd64/linux32/linux.h
Modified: head/sys/amd64/linux32/linux.h
==============================================================================
--- head/sys/amd64/linux32/linux.h Thu Jan 27 21:41:27 2011
(r217990)
+++ head/sys/amd64/linux32/linux.h Thu Jan 27 21:45:38 2011
(r217991)
@@ -370,28 +370,28 @@ typedef struct {
/* The Linux sigcontext, pretty much a standard 386 trapframe. */
struct l_sigcontext {
- l_int sc_gs;
- l_int sc_fs;
- l_int sc_es;
- l_int sc_ds;
- l_int sc_edi;
- l_int sc_esi;
- l_int sc_ebp;
- l_int sc_esp;
- l_int sc_ebx;
- l_int sc_edx;
- l_int sc_ecx;
- l_int sc_eax;
- l_int sc_trapno;
- l_int sc_err;
- l_int sc_eip;
- l_int sc_cs;
- l_int sc_eflags;
- l_int sc_esp_at_signal;
- l_int sc_ss;
- l_int sc_387;
- l_int sc_mask;
- l_int sc_cr2;
+ l_uint sc_gs;
+ l_uint sc_fs;
+ l_uint sc_es;
+ l_uint sc_ds;
+ l_uint sc_edi;
+ l_uint sc_esi;
+ l_uint sc_ebp;
+ l_uint sc_esp;
+ l_uint sc_ebx;
+ l_uint sc_edx;
+ l_uint sc_ecx;
+ l_uint sc_eax;
+ l_uint sc_trapno;
+ l_uint sc_err;
+ l_uint sc_eip;
+ l_uint sc_cs;
+ l_uint sc_eflags;
+ l_uint sc_esp_at_signal;
+ l_uint sc_ss;
+ l_uint sc_387;
+ l_uint sc_mask;
+ l_uint sc_cr2;
} __packed;
struct l_ucontext {
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