remeve x86 hotfixes
git-svn-id: https://svn.disconnected-by-peer.at/svn/linamh/trunk/genlink@2486 6952d904-891a-0410-993b-d76249ca496b
This commit is contained in:
geos_one
parent
1c4e24fb55
commit
ecf017be9d
@ -1,97 +0,0 @@
|
||||
From 36d001c70d8a0144ac1d038f6876c484849a74de Mon Sep 17 00:00:00 2001
|
||||
From: H. Peter Anvin <hpa@linux.intel.com>
|
||||
Date: Tue, 14 Sep 2010 12:42:41 -0700
|
||||
Subject: [PATCH] x86-64, compat: Test %rax for the syscall number, not %eax
|
||||
|
||||
On 64 bits, we always, by necessity, jump through the system call
|
||||
table via %rax. For 32-bit system calls, in theory the system call
|
||||
number is stored in %eax, and the code was testing %eax for a valid
|
||||
system call number. At one point we loaded the stored value back from
|
||||
the stack to enforce zero-extension, but that was removed in checkin
|
||||
d4d67150165df8bf1cc05e532f6efca96f907cab. An actual 32-bit process
|
||||
will not be able to introduce a non-zero-extended number, but it can
|
||||
happen via ptrace.
|
||||
|
||||
Instead of re-introducing the zero-extension, test what we are
|
||||
actually going to use, i.e. %rax. This only adds a handful of REX
|
||||
prefixes to the code.
|
||||
|
||||
Reported-by: Ben Hawkes <hawkes@sota.gen.nz>
|
||||
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
|
||||
Cc: <stable@kernel.org>
|
||||
Cc: Roland McGrath <roland@redhat.com>
|
||||
Cc: Andrew Morton <akpm@linux-foundation.org>
|
||||
---
|
||||
arch/x86/ia32/ia32entry.S | 14 +++++++-------
|
||||
1 files changed, 7 insertions(+), 7 deletions(-)
|
||||
|
||||
diff --git a/arch/x86/ia32/ia32entry.S b/arch/x86/ia32/ia32entry.S
|
||||
index b86feab..84e3a4e 100644
|
||||
--- a/arch/x86/ia32/ia32entry.S
|
||||
+++ b/arch/x86/ia32/ia32entry.S
|
||||
@@ -153,7 +153,7 @@ ENTRY(ia32_sysenter_target)
|
||||
testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%r10)
|
||||
CFI_REMEMBER_STATE
|
||||
jnz sysenter_tracesys
|
||||
- cmpl $(IA32_NR_syscalls-1),%eax
|
||||
+ cmpq $(IA32_NR_syscalls-1),%rax
|
||||
ja ia32_badsys
|
||||
sysenter_do_call:
|
||||
IA32_ARG_FIXUP
|
||||
@@ -195,7 +195,7 @@ sysexit_from_sys_call:
|
||||
movl $AUDIT_ARCH_I386,%edi /* 1st arg: audit arch */
|
||||
call audit_syscall_entry
|
||||
movl RAX-ARGOFFSET(%rsp),%eax /* reload syscall number */
|
||||
- cmpl $(IA32_NR_syscalls-1),%eax
|
||||
+ cmpq $(IA32_NR_syscalls-1),%rax
|
||||
ja ia32_badsys
|
||||
movl %ebx,%edi /* reload 1st syscall arg */
|
||||
movl RCX-ARGOFFSET(%rsp),%esi /* reload 2nd syscall arg */
|
||||
@@ -248,7 +248,7 @@ sysenter_tracesys:
|
||||
call syscall_trace_enter
|
||||
LOAD_ARGS32 ARGOFFSET /* reload args from stack in case ptrace changed it */
|
||||
RESTORE_REST
|
||||
- cmpl $(IA32_NR_syscalls-1),%eax
|
||||
+ cmpq $(IA32_NR_syscalls-1),%rax
|
||||
ja int_ret_from_sys_call /* sysenter_tracesys has set RAX(%rsp) */
|
||||
jmp sysenter_do_call
|
||||
CFI_ENDPROC
|
||||
@@ -314,7 +314,7 @@ ENTRY(ia32_cstar_target)
|
||||
testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%r10)
|
||||
CFI_REMEMBER_STATE
|
||||
jnz cstar_tracesys
|
||||
- cmpl $IA32_NR_syscalls-1,%eax
|
||||
+ cmpq $IA32_NR_syscalls-1,%rax
|
||||
ja ia32_badsys
|
||||
cstar_do_call:
|
||||
IA32_ARG_FIXUP 1
|
||||
@@ -367,7 +367,7 @@ cstar_tracesys:
|
||||
LOAD_ARGS32 ARGOFFSET, 1 /* reload args from stack in case ptrace changed it */
|
||||
RESTORE_REST
|
||||
xchgl %ebp,%r9d
|
||||
- cmpl $(IA32_NR_syscalls-1),%eax
|
||||
+ cmpq $(IA32_NR_syscalls-1),%rax
|
||||
ja int_ret_from_sys_call /* cstar_tracesys has set RAX(%rsp) */
|
||||
jmp cstar_do_call
|
||||
END(ia32_cstar_target)
|
||||
@@ -425,7 +425,7 @@ ENTRY(ia32_syscall)
|
||||
orl $TS_COMPAT,TI_status(%r10)
|
||||
testl $_TIF_WORK_SYSCALL_ENTRY,TI_flags(%r10)
|
||||
jnz ia32_tracesys
|
||||
- cmpl $(IA32_NR_syscalls-1),%eax
|
||||
+ cmpq $(IA32_NR_syscalls-1),%rax
|
||||
ja ia32_badsys
|
||||
ia32_do_call:
|
||||
IA32_ARG_FIXUP
|
||||
@@ -444,7 +444,7 @@ ia32_tracesys:
|
||||
call syscall_trace_enter
|
||||
LOAD_ARGS32 ARGOFFSET /* reload args from stack in case ptrace changed it */
|
||||
RESTORE_REST
|
||||
- cmpl $(IA32_NR_syscalls-1),%eax
|
||||
+ cmpq $(IA32_NR_syscalls-1),%rax
|
||||
ja int_ret_from_sys_call /* ia32_tracesys has set RAX(%rsp) */
|
||||
jmp ia32_do_call
|
||||
END(ia32_syscall)
|
||||
--
|
||||
1.7.2.3
|
||||
|
||||
@ -1,190 +0,0 @@
|
||||
From c41d68a513c71e35a14f66d71782d27a79a81ea6 Mon Sep 17 00:00:00 2001
|
||||
From: H. Peter Anvin <hpa@linux.intel.com>
|
||||
Date: Tue, 7 Sep 2010 16:16:18 -0700
|
||||
Subject: [PATCH] compat: Make compat_alloc_user_space() incorporate the access_ok()
|
||||
|
||||
compat_alloc_user_space() expects the caller to independently call
|
||||
access_ok() to verify the returned area. A missing call could
|
||||
introduce problems on some architectures.
|
||||
|
||||
This patch incorporates the access_ok() check into
|
||||
compat_alloc_user_space() and also adds a sanity check on the length.
|
||||
The existing compat_alloc_user_space() implementations are renamed
|
||||
arch_compat_alloc_user_space() and are used as part of the
|
||||
implementation of the new global function.
|
||||
|
||||
This patch assumes NULL will cause __get_user()/__put_user() to either
|
||||
fail or access userspace on all architectures. This should be
|
||||
followed by checking the return value of compat_access_user_space()
|
||||
for NULL in the callers, at which time the access_ok() in the callers
|
||||
can also be removed.
|
||||
|
||||
Reported-by: Ben Hawkes <hawkes@sota.gen.nz>
|
||||
Signed-off-by: H. Peter Anvin <hpa@linux.intel.com>
|
||||
Acked-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
|
||||
Acked-by: Chris Metcalf <cmetcalf@tilera.com>
|
||||
Acked-by: David S. Miller <davem@davemloft.net>
|
||||
Acked-by: Ingo Molnar <mingo@elte.hu>
|
||||
Acked-by: Thomas Gleixner <tglx@linutronix.de>
|
||||
Acked-by: Tony Luck <tony.luck@intel.com>
|
||||
Cc: Andrew Morton <akpm@linux-foundation.org>
|
||||
Cc: Arnd Bergmann <arnd@arndb.de>
|
||||
Cc: Fenghua Yu <fenghua.yu@intel.com>
|
||||
Cc: H. Peter Anvin <hpa@zytor.com>
|
||||
Cc: Heiko Carstens <heiko.carstens@de.ibm.com>
|
||||
Cc: Helge Deller <deller@gmx.de>
|
||||
Cc: James Bottomley <jejb@parisc-linux.org>
|
||||
Cc: Kyle McMartin <kyle@mcmartin.ca>
|
||||
Cc: Martin Schwidefsky <schwidefsky@de.ibm.com>
|
||||
Cc: Paul Mackerras <paulus@samba.org>
|
||||
Cc: Ralf Baechle <ralf@linux-mips.org>
|
||||
Cc: <stable@kernel.org>
|
||||
---
|
||||
arch/ia64/include/asm/compat.h | 2 +-
|
||||
arch/mips/include/asm/compat.h | 2 +-
|
||||
arch/parisc/include/asm/compat.h | 2 +-
|
||||
arch/powerpc/include/asm/compat.h | 2 +-
|
||||
arch/s390/include/asm/compat.h | 2 +-
|
||||
arch/sparc/include/asm/compat.h | 2 +-
|
||||
arch/tile/include/asm/compat.h | 2 +-
|
||||
arch/x86/include/asm/compat.h | 2 +-
|
||||
include/linux/compat.h | 3 +++
|
||||
kernel/compat.c | 21 +++++++++++++++++++++
|
||||
10 files changed, 32 insertions(+), 8 deletions(-)
|
||||
|
||||
diff --git a/arch/ia64/include/asm/compat.h b/arch/ia64/include/asm/compat.h
|
||||
index f90edc8..9301a28 100644
|
||||
--- a/arch/ia64/include/asm/compat.h
|
||||
+++ b/arch/ia64/include/asm/compat.h
|
||||
@@ -199,7 +199,7 @@ ptr_to_compat(void __user *uptr)
|
||||
}
|
||||
|
||||
static __inline__ void __user *
|
||||
-compat_alloc_user_space (long len)
|
||||
+arch_compat_alloc_user_space (long len)
|
||||
{
|
||||
struct pt_regs *regs = task_pt_regs(current);
|
||||
return (void __user *) (((regs->r12 & 0xffffffff) & -16) - len);
|
||||
diff --git a/arch/mips/include/asm/compat.h b/arch/mips/include/asm/compat.h
|
||||
index 613f691..dbc5106 100644
|
||||
--- a/arch/mips/include/asm/compat.h
|
||||
+++ b/arch/mips/include/asm/compat.h
|
||||
@@ -145,7 +145,7 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr)
|
||||
return (u32)(unsigned long)uptr;
|
||||
}
|
||||
|
||||
-static inline void __user *compat_alloc_user_space(long len)
|
||||
+static inline void __user *arch_compat_alloc_user_space(long len)
|
||||
{
|
||||
struct pt_regs *regs = (struct pt_regs *)
|
||||
((unsigned long) current_thread_info() + THREAD_SIZE - 32) - 1;
|
||||
diff --git a/arch/parisc/include/asm/compat.h b/arch/parisc/include/asm/compat.h
|
||||
index 02b77ba..efa0b60 100644
|
||||
--- a/arch/parisc/include/asm/compat.h
|
||||
+++ b/arch/parisc/include/asm/compat.h
|
||||
@@ -147,7 +147,7 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr)
|
||||
return (u32)(unsigned long)uptr;
|
||||
}
|
||||
|
||||
-static __inline__ void __user *compat_alloc_user_space(long len)
|
||||
+static __inline__ void __user *arch_compat_alloc_user_space(long len)
|
||||
{
|
||||
struct pt_regs *regs = ¤t->thread.regs;
|
||||
return (void __user *)regs->gr[30];
|
||||
diff --git a/arch/powerpc/include/asm/compat.h b/arch/powerpc/include/asm/compat.h
|
||||
index 396d21a..a11d4ea 100644
|
||||
--- a/arch/powerpc/include/asm/compat.h
|
||||
+++ b/arch/powerpc/include/asm/compat.h
|
||||
@@ -134,7 +134,7 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr)
|
||||
return (u32)(unsigned long)uptr;
|
||||
}
|
||||
|
||||
-static inline void __user *compat_alloc_user_space(long len)
|
||||
+static inline void __user *arch_compat_alloc_user_space(long len)
|
||||
{
|
||||
struct pt_regs *regs = current->thread.regs;
|
||||
unsigned long usp = regs->gpr[1];
|
||||
diff --git a/arch/s390/include/asm/compat.h b/arch/s390/include/asm/compat.h
|
||||
index 104f200..a875c2f 100644
|
||||
--- a/arch/s390/include/asm/compat.h
|
||||
+++ b/arch/s390/include/asm/compat.h
|
||||
@@ -181,7 +181,7 @@ static inline int is_compat_task(void)
|
||||
|
||||
#endif
|
||||
|
||||
-static inline void __user *compat_alloc_user_space(long len)
|
||||
+static inline void __user *arch_compat_alloc_user_space(long len)
|
||||
{
|
||||
unsigned long stack;
|
||||
|
||||
diff --git a/arch/sparc/include/asm/compat.h b/arch/sparc/include/asm/compat.h
|
||||
index 5016f76..6f57325 100644
|
||||
--- a/arch/sparc/include/asm/compat.h
|
||||
+++ b/arch/sparc/include/asm/compat.h
|
||||
@@ -167,7 +167,7 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr)
|
||||
return (u32)(unsigned long)uptr;
|
||||
}
|
||||
|
||||
-static inline void __user *compat_alloc_user_space(long len)
|
||||
+static inline void __user *arch_compat_alloc_user_space(long len)
|
||||
{
|
||||
struct pt_regs *regs = current_thread_info()->kregs;
|
||||
unsigned long usp = regs->u_regs[UREG_I6];
|
||||
diff --git a/arch/x86/include/asm/compat.h b/arch/x86/include/asm/compat.h
|
||||
index 306160e..1d9cd27 100644
|
||||
--- a/arch/x86/include/asm/compat.h
|
||||
+++ b/arch/x86/include/asm/compat.h
|
||||
@@ -205,7 +205,7 @@ static inline compat_uptr_t ptr_to_compat(void __user *uptr)
|
||||
return (u32)(unsigned long)uptr;
|
||||
}
|
||||
|
||||
-static inline void __user *compat_alloc_user_space(long len)
|
||||
+static inline void __user *arch_compat_alloc_user_space(long len)
|
||||
{
|
||||
struct pt_regs *regs = task_pt_regs(current);
|
||||
return (void __user *)regs->sp - len;
|
||||
diff --git a/include/linux/compat.h b/include/linux/compat.h
|
||||
index 9ddc878..5778b55 100644
|
||||
--- a/include/linux/compat.h
|
||||
+++ b/include/linux/compat.h
|
||||
@@ -360,5 +360,8 @@ extern ssize_t compat_rw_copy_check_uvector(int type,
|
||||
const struct compat_iovec __user *uvector, unsigned long nr_segs,
|
||||
unsigned long fast_segs, struct iovec *fast_pointer,
|
||||
struct iovec **ret_pointer);
|
||||
+
|
||||
+extern void __user *compat_alloc_user_space(unsigned long len);
|
||||
+
|
||||
#endif /* CONFIG_COMPAT */
|
||||
#endif /* _LINUX_COMPAT_H */
|
||||
diff --git a/kernel/compat.c b/kernel/compat.c
|
||||
index e167efc..c9e2ec0 100644
|
||||
--- a/kernel/compat.c
|
||||
+++ b/kernel/compat.c
|
||||
@@ -1126,3 +1126,24 @@ compat_sys_sysinfo(struct compat_sysinfo __user *info)
|
||||
|
||||
return 0;
|
||||
}
|
||||
+
|
||||
+/*
|
||||
+ * Allocate user-space memory for the duration of a single system call,
|
||||
+ * in order to marshall parameters inside a compat thunk.
|
||||
+ */
|
||||
+void __user *compat_alloc_user_space(unsigned long len)
|
||||
+{
|
||||
+ void __user *ptr;
|
||||
+
|
||||
+ /* If len would occupy more than half of the entire compat space... */
|
||||
+ if (unlikely(len > (((compat_uptr_t)~0) >> 1)))
|
||||
+ return NULL;
|
||||
+
|
||||
+ ptr = arch_compat_alloc_user_space(len);
|
||||
+
|
||||
+ if (unlikely(!access_ok(VERIFY_WRITE, ptr, len)))
|
||||
+ return NULL;
|
||||
+
|
||||
+ return ptr;
|
||||
+}
|
||||
+EXPORT_SYMBOL_GPL(compat_alloc_user_space);
|
||||
--
|
||||
1.7.2.3
|
||||
|
||||
@ -1,49 +0,0 @@
|
||||
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
|
||||
--
|
||||
1.7.2.3
|
||||
|
||||
Loading…
Reference in New Issue
Block a user