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author | Al Viro <viro@zeniv.linux.org.uk> | 2017-07-09 17:27:22 +0300 |
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committer | Al Viro <viro@zeniv.linux.org.uk> | 2017-07-16 03:46:45 +0300 |
commit | 20bc2a3aff5a88a666e81182fd277ea2a521fd3d (patch) | |
tree | 5834be6c2b551d9429c250b6c620f32dedb9ed0c /ipc/syscall.c | |
parent | 28327fae62b011216026b66299882c53b95b4500 (diff) | |
download | linux-20bc2a3aff5a88a666e81182fd277ea2a521fd3d.tar.xz |
ipc(2): move compat to native
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Diffstat (limited to 'ipc/syscall.c')
-rw-r--r-- | ipc/syscall.c | 90 |
1 files changed, 89 insertions, 1 deletions
diff --git a/ipc/syscall.c b/ipc/syscall.c index 52429489cde0..667022746ca5 100644 --- a/ipc/syscall.c +++ b/ipc/syscall.c @@ -5,12 +5,12 @@ * the individual syscalls instead. */ #include <linux/unistd.h> +#include <linux/syscalls.h> #ifdef __ARCH_WANT_SYS_IPC #include <linux/errno.h> #include <linux/ipc.h> #include <linux/shm.h> -#include <linux/syscalls.h> #include <linux/uaccess.h> SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second, @@ -97,3 +97,91 @@ SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second, } } #endif + +#ifdef CONFIG_COMPAT +#include <linux/compat.h> + +#ifndef COMPAT_SHMLBA +#define COMPAT_SHMLBA SHMLBA +#endif + +struct compat_ipc_kludge { + compat_uptr_t msgp; + compat_long_t msgtyp; +}; + +#ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC +COMPAT_SYSCALL_DEFINE6(ipc, u32, call, int, first, int, second, + u32, third, compat_uptr_t, ptr, u32, fifth) +{ + int version; + u32 pad; + + version = call >> 16; /* hack for backward compatibility */ + call &= 0xffff; + + switch (call) { + case SEMOP: + /* struct sembuf is the same on 32 and 64bit :)) */ + return sys_semtimedop(first, compat_ptr(ptr), second, NULL); + case SEMTIMEDOP: + return compat_sys_semtimedop(first, compat_ptr(ptr), second, + compat_ptr(fifth)); + case SEMGET: + return sys_semget(first, second, third); + case SEMCTL: + if (!ptr) + return -EINVAL; + if (get_user(pad, (u32 __user *) compat_ptr(ptr))) + return -EFAULT; + return compat_sys_semctl(first, second, third, pad); + + case MSGSND: + return compat_sys_msgsnd(first, ptr, second, third); + + case MSGRCV: { + void __user *uptr = compat_ptr(ptr); + + if (first < 0 || second < 0) + return -EINVAL; + + if (!version) { + struct compat_ipc_kludge ipck; + if (!uptr) + return -EINVAL; + if (copy_from_user(&ipck, uptr, sizeof(ipck))) + return -EFAULT; + return compat_sys_msgrcv(first, ipck.msgp, second, + ipck.msgtyp, third); + } + return compat_sys_msgrcv(first, ptr, second, fifth, third); + } + case MSGGET: + return sys_msgget(first, second); + case MSGCTL: + return compat_sys_msgctl(first, second, compat_ptr(ptr)); + + case SHMAT: { + int err; + unsigned long raddr; + + if (version == 1) + return -EINVAL; + err = do_shmat(first, compat_ptr(ptr), second, &raddr, + COMPAT_SHMLBA); + if (err < 0) + return err; + return put_user(raddr, (compat_ulong_t *)compat_ptr(third)); + } + case SHMDT: + return sys_shmdt(compat_ptr(ptr)); + case SHMGET: + return sys_shmget(first, (unsigned)second, third); + case SHMCTL: + return compat_sys_shmctl(first, second, compat_ptr(ptr)); + } + + return -ENOSYS; +} +#endif +#endif |