--- /dev/null
+From fd0c153daad135d0ec1a53c5dbe6936a724d6ae1 Mon Sep 17 00:00:00 2001
+From: Al Viro <viro@zeniv.linux.org.uk>
+Date: Mon, 8 Aug 2022 16:09:45 +0100
+Subject: nios2: add force_successful_syscall_return()
+
+From: Al Viro <viro@zeniv.linux.org.uk>
+
+commit fd0c153daad135d0ec1a53c5dbe6936a724d6ae1 upstream.
+
+If we use the ancient SysV syscall ABI, we'd better have tell the
+kernel how to claim that a negative return value is a success.
+Use ->orig_r2 for that - it's inaccessible via ptrace, so it's
+a fair game for changes and it's normally[*] non-negative on return
+from syscall. Set to -1; syscall is not going to be restart-worthy
+by definition, so we won't interfere with that use either.
+
+[*] the only exception is rt_sigreturn(), where we skip the entire
+messing with r1/r2 anyway.
+
+Fixes: 82ed08dd1b0e ("nios2: Exception handling")
+Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
+Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ arch/nios2/include/asm/ptrace.h | 2 ++
+ arch/nios2/kernel/entry.S | 6 ++++++
+ 2 files changed, 8 insertions(+)
+
+--- a/arch/nios2/include/asm/ptrace.h
++++ b/arch/nios2/include/asm/ptrace.h
+@@ -74,6 +74,8 @@ extern void show_regs(struct pt_regs *);
+ ((struct pt_regs *)((unsigned long)current_thread_info() + THREAD_SIZE)\
+ - 1)
+
++#define force_successful_syscall_return() (current_pt_regs()->orig_r2 = -1)
++
+ int do_syscall_trace_enter(void);
+ void do_syscall_trace_exit(void);
+ #endif /* __ASSEMBLY__ */
+--- a/arch/nios2/kernel/entry.S
++++ b/arch/nios2/kernel/entry.S
+@@ -213,6 +213,9 @@ local_restart:
+ translate_rc_and_ret:
+ movi r1, 0
+ bge r2, zero, 3f
++ ldw r1, PT_ORIG_R2(sp)
++ addi r1, r1, 1
++ beq r1, zero, 3f
+ sub r2, zero, r2
+ movi r1, 1
+ 3:
+@@ -276,6 +279,9 @@ traced_system_call:
+ translate_rc_and_ret2:
+ movi r1, 0
+ bge r2, zero, 4f
++ ldw r1, PT_ORIG_R2(sp)
++ addi r1, r1, 1
++ beq r1, zero, 4f
+ sub r2, zero, r2
+ movi r1, 1
+ 4:
--- /dev/null
+From 45ec746c65097c25e77d24eae8fee0def5b6cc5d Mon Sep 17 00:00:00 2001
+From: Al Viro <viro@zeniv.linux.org.uk>
+Date: Mon, 8 Aug 2022 16:06:46 +0100
+Subject: nios2: don't leave NULLs in sys_call_table[]
+
+From: Al Viro <viro@zeniv.linux.org.uk>
+
+commit 45ec746c65097c25e77d24eae8fee0def5b6cc5d upstream.
+
+fill the gaps in there with sys_ni_syscall, as everyone does...
+
+Fixes: 82ed08dd1b0e ("nios2: Exception handling")
+Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
+Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ arch/nios2/kernel/entry.S | 1 -
+ arch/nios2/kernel/syscall_table.c | 1 +
+ 2 files changed, 1 insertion(+), 1 deletion(-)
+
+--- a/arch/nios2/kernel/entry.S
++++ b/arch/nios2/kernel/entry.S
+@@ -193,7 +193,6 @@ local_restart:
+ movhi r11, %hiadj(sys_call_table)
+ add r1, r1, r11
+ ldw r1, %lo(sys_call_table)(r1)
+- beq r1, r0, ret_invsyscall
+
+ /* Check if we are being traced */
+ GET_THREAD_INFO r11
+--- a/arch/nios2/kernel/syscall_table.c
++++ b/arch/nios2/kernel/syscall_table.c
+@@ -25,5 +25,6 @@
+ #define __SYSCALL(nr, call) [nr] = (call),
+
+ void *sys_call_table[__NR_syscalls] = {
++ [0 ... __NR_syscalls-1] = sys_ni_syscall,
+ #include <asm/unistd.h>
+ };
--- /dev/null
+From 2d631bd58fe0ea3e3350212e23c9aba1fb606514 Mon Sep 17 00:00:00 2001
+From: Al Viro <viro@zeniv.linux.org.uk>
+Date: Mon, 8 Aug 2022 16:08:48 +0100
+Subject: nios2: fix syscall restart checks
+
+From: Al Viro <viro@zeniv.linux.org.uk>
+
+commit 2d631bd58fe0ea3e3350212e23c9aba1fb606514 upstream.
+
+sys_foo() returns -512 (aka -ERESTARTSYS) => do_signal() sees
+512 in r2 and 1 in r1.
+
+sys_foo() returns 512 => do_signal() sees 512 in r2 and 0 in r1.
+
+The former is restart-worthy; the latter obviously isn't.
+
+Fixes: b53e906d255d ("nios2: Signal handling support")
+Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
+Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ arch/nios2/kernel/signal.c | 2 +-
+ 1 file changed, 1 insertion(+), 1 deletion(-)
+
+--- a/arch/nios2/kernel/signal.c
++++ b/arch/nios2/kernel/signal.c
+@@ -240,7 +240,7 @@ static int do_signal(struct pt_regs *reg
+ /*
+ * If we were from a system call, check for system call restarting...
+ */
+- if (regs->orig_r2 >= 0) {
++ if (regs->orig_r2 >= 0 && regs->r1) {
+ continue_addr = regs->ea;
+ restart_addr = continue_addr - 4;
+ retval = regs->r2;
--- /dev/null
+From 8535c239ac674f7ead0f2652932d35c52c4123b2 Mon Sep 17 00:00:00 2001
+From: Al Viro <viro@zeniv.linux.org.uk>
+Date: Mon, 8 Aug 2022 16:06:04 +0100
+Subject: nios2: page fault et.al. are *not* restartable syscalls...
+
+From: Al Viro <viro@zeniv.linux.org.uk>
+
+commit 8535c239ac674f7ead0f2652932d35c52c4123b2 upstream.
+
+make sure that ->orig_r2 is negative for everything except
+the syscalls.
+
+Fixes: 82ed08dd1b0e ("nios2: Exception handling")
+Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
+Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ arch/nios2/include/asm/entry.h | 3 ++-
+ arch/nios2/kernel/entry.S | 4 +---
+ 2 files changed, 3 insertions(+), 4 deletions(-)
+
+--- a/arch/nios2/include/asm/entry.h
++++ b/arch/nios2/include/asm/entry.h
+@@ -50,7 +50,8 @@
+ stw r13, PT_R13(sp)
+ stw r14, PT_R14(sp)
+ stw r15, PT_R15(sp)
+- stw r2, PT_ORIG_R2(sp)
++ movi r24, -1
++ stw r24, PT_ORIG_R2(sp)
+ stw r7, PT_ORIG_R7(sp)
+
+ stw ra, PT_RA(sp)
+--- a/arch/nios2/kernel/entry.S
++++ b/arch/nios2/kernel/entry.S
+@@ -185,6 +185,7 @@ ENTRY(handle_system_call)
+ ldw r5, PT_R5(sp)
+
+ local_restart:
++ stw r2, PT_ORIG_R2(sp)
+ /* Check that the requested system call is within limits */
+ movui r1, __NR_syscalls
+ bgeu r2, r1, ret_invsyscall
+@@ -336,9 +337,6 @@ external_interrupt:
+ /* skip if no interrupt is pending */
+ beq r12, r0, ret_from_interrupt
+
+- movi r24, -1
+- stw r24, PT_ORIG_R2(sp)
+-
+ /*
+ * Process an external hardware interrupt.
+ */
--- /dev/null
+From 411a76b7219555c55867466c82d70ce928d6c9e1 Mon Sep 17 00:00:00 2001
+From: Al Viro <viro@zeniv.linux.org.uk>
+Date: Mon, 8 Aug 2022 16:09:16 +0100
+Subject: nios2: restarts apply only to the first sigframe we build...
+
+From: Al Viro <viro@zeniv.linux.org.uk>
+
+commit 411a76b7219555c55867466c82d70ce928d6c9e1 upstream.
+
+Fixes: b53e906d255d ("nios2: Signal handling support")
+Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
+Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ arch/nios2/kernel/signal.c | 1 +
+ 1 file changed, 1 insertion(+)
+
+--- a/arch/nios2/kernel/signal.c
++++ b/arch/nios2/kernel/signal.c
+@@ -261,6 +261,7 @@ static int do_signal(struct pt_regs *reg
+ regs->ea = restart_addr;
+ break;
+ }
++ regs->orig_r2 = -1;
+ }
+
+ if (get_signal(&ksig)) {
--- /dev/null
+From 25ba820ef36bdbaf9884adeac69b6e1821a7df76 Mon Sep 17 00:00:00 2001
+From: Al Viro <viro@zeniv.linux.org.uk>
+Date: Mon, 8 Aug 2022 16:07:21 +0100
+Subject: nios2: traced syscall does need to check the syscall number
+
+From: Al Viro <viro@zeniv.linux.org.uk>
+
+commit 25ba820ef36bdbaf9884adeac69b6e1821a7df76 upstream.
+
+all checks done before letting the tracer modify the register
+state are worthless...
+
+Fixes: 82ed08dd1b0e ("nios2: Exception handling")
+Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
+Signed-off-by: Dinh Nguyen <dinguyen@kernel.org>
+Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
+---
+ arch/nios2/kernel/entry.S | 11 ++++++++---
+ 1 file changed, 8 insertions(+), 3 deletions(-)
+
+--- a/arch/nios2/kernel/entry.S
++++ b/arch/nios2/kernel/entry.S
+@@ -255,9 +255,9 @@ traced_system_call:
+ ldw r6, PT_R6(sp)
+ ldw r7, PT_R7(sp)
+
+- /* Fetch the syscall function, we don't need to check the boundaries
+- * since this is already done.
+- */
++ /* Fetch the syscall function. */
++ movui r1, __NR_syscalls
++ bgeu r2, r1, traced_invsyscall
+ slli r1, r2, 2
+ movhi r11,%hiadj(sys_call_table)
+ add r1, r1, r11
+@@ -287,6 +287,11 @@ end_translate_rc_and_ret2:
+ RESTORE_SWITCH_STACK
+ br ret_from_exception
+
++ /* If the syscall number was invalid return ENOSYS */
++traced_invsyscall:
++ movi r2, -ENOSYS
++ br translate_rc_and_ret2
++
+ Luser_return:
+ GET_THREAD_INFO r11 /* get thread_info pointer */
+ ldw r10, TI_FLAGS(r11) /* get thread_info->flags */
vsock-fix-memory-leak-in-vsock_connect.patch
xen-xenbus-fix-return-type-in-xenbus_file_read.patch
atm-idt77252-fix-use-after-free-bugs-caused-by-tst_timer.patch
+nios2-page-fault-et.al.-are-not-restartable-syscalls.patch
+nios2-don-t-leave-nulls-in-sys_call_table.patch
+nios2-traced-syscall-does-need-to-check-the-syscall-number.patch
+nios2-fix-syscall-restart-checks.patch
+nios2-restarts-apply-only-to-the-first-sigframe-we-build.patch
+nios2-add-force_successful_syscall_return.patch
projects / thirdparty / kernel / stable-queue.git / commitdiff
