Quoting Pekka J Enberg ([email protected]):
> From: Pekka Enberg <[email protected]>
>
> The revokeat(2) and frevoke(2) system calls invalidate open file
> descriptors and shared mappings of an inode. After an successful
> revocation, operations on file descriptors fail with the EBADF or
> ENXIO error code for regular and device files,
> respectively. Attempting to read from or write to a revoked mapping
> causes SIGBUS.
>
> The actual operation is done in two passes:
>
> 1. Revoke all file descriptors that point to the given inode. We do
> this under tasklist_lock so that after this pass, we don't need
> to worry about racing with close(2) or dup(2).
>
> 2. Take down shared memory mappings of each revoked file and close
> the file pointer.
>
> The file descriptors are kept until the owning task does close(2) and
> memory mapping ranges preserved until the owning task does munmap(2).
With the attached patch, this passes all your revoke tests on s390,
as well as ltp runalltests.sh.
thanks,
-serge
From: "Serge E. Hallyn" <[email protected]>
Subject: [PATCH] revoke: do s390 syscalls
revoke: do s390 syscalls
Signed-off-by: Serge E. Hallyn <[email protected]>
(cherry picked from 9962b52d7bd7b70b99e7515d30b8217b0de491b3 commit)
---
arch/s390/kernel/compat_wrapper.S | 11 +++++++++++
arch/s390/kernel/syscalls.S | 2 ++
include/asm-s390/unistd.h | 4 +++-
3 files changed, 16 insertions(+), 1 deletions(-)
3f0afa7b9a6b8c9ec930bdef73601f7260c79f47
diff --git a/arch/s390/kernel/compat_wrapper.S b/arch/s390/kernel/compat_wrapper.S
index 71e54ef..b5c2bfa 100644
--- a/arch/s390/kernel/compat_wrapper.S
+++ b/arch/s390/kernel/compat_wrapper.S
@@ -1665,3 +1665,14 @@ sys_getcpu_wrapper:
llgtr %r3,%r3 # unsigned *
llgtr %r4,%r4 # struct getcpu_cache *
jg sys_getcpu
+
+ .globl sys_revokeat_wrapper
+sys_revokeat_wrapper:
+ lgfr %r2,%r2 # int
+ llgtr %r3,%r3 # const char *
+ jg sys_revokeat
+
+ .globl sys_frevoke_wrapper
+sys_frevoke_wrapper:
+ llgfr %r2,%r2 # unsigned int
+ jg sys_frevoke
diff --git a/arch/s390/kernel/syscalls.S b/arch/s390/kernel/syscalls.S
index a4ceae3..85a6673 100644
--- a/arch/s390/kernel/syscalls.S
+++ b/arch/s390/kernel/syscalls.S
@@ -321,3 +321,5 @@ SYSCALL(sys_vmsplice,sys_vmsplice,compat
NI_SYSCALL /* 310 sys_move_pages */
SYSCALL(sys_getcpu,sys_getcpu,sys_getcpu_wrapper)
SYSCALL(sys_epoll_pwait,sys_epoll_pwait,sys_ni_syscall)
+SYSCALL(sys_revokeat,sys_revokeat,sys_revokeat_wrapper)
+SYSCALL(sys_frevoke,sys_frevoke,sys_frevoke_wrapper)
diff --git a/include/asm-s390/unistd.h b/include/asm-s390/unistd.h
index fb6fef9..6651cb1 100644
--- a/include/asm-s390/unistd.h
+++ b/include/asm-s390/unistd.h
@@ -250,8 +250,10 @@
/* Number 310 is reserved for new sys_move_pages */
#define __NR_getcpu 311
#define __NR_epoll_pwait 312
+#define __NR_revokeat 313
+#define __NR_frevoke 314
-#define NR_syscalls 313
+#define NR_syscalls 315
/*
* There are some system calls that are not present on 64 bit, some
--
1.1.6
-
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