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ipc: add COMPAT_SHMLBA support

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If the SHMLBA definition for a native task differs from the definition for
a compat task, the do_shmat() function would need to handle both.

This patch introduces COMPAT_SHMLBA, which is used by the compat shmat
syscall when calling the ipc code and allows architectures such as AArch64
(where the native SHMLBA is 64k but the compat (AArch32) definition is
16k) to provide the correct semantics for compat IPC system calls.

Cc: David S. Miller <[email protected]>
Cc: Chris Zankel <[email protected]>
Cc: Arnd Bergmann <[email protected]>
Acked-by: Catalin Marinas <[email protected]>
Signed-off-by: Will Deacon <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Will Deacon 2012-07-30 14:42:38 -07:00 • committed by Linus Torvalds
commit 079a96ae38
6 changed files with 18 additions and 11 deletions
Download patch file Download diff file Expand all files Collapse all files

8
ipc/compat.c
View file

@ -514,6 +514,10 @@ long compat_sys_msgctl(int first, int second, void __user *uptr)
return err;
}
#ifndef COMPAT_SHMLBA
#define COMPAT_SHMLBA SHMLBA
#endif
#ifdef CONFIG_ARCH_WANT_OLD_COMPAT_IPC
long compat_sys_shmat(int first, int second, compat_uptr_t third, int version,
void __user *uptr)
@ -524,7 +528,7 @@ long compat_sys_shmat(int first, int second, compat_uptr_t third, int version,
if (version == 1)
return -EINVAL;
err = do_shmat(first, uptr, second, &raddr);
err = do_shmat(first, uptr, second, &raddr, COMPAT_SHMLBA);
if (err < 0)
return err;
uaddr = compat_ptr(third);
@ -536,7 +540,7 @@ long compat_sys_shmat(int shmid, compat_uptr_t shmaddr, int shmflg)
unsigned long ret;
long err;
err = do_shmat(shmid, compat_ptr(shmaddr), shmflg, &ret);
err = do_shmat(shmid, compat_ptr(shmaddr), shmflg, &ret, COMPAT_SHMLBA);
if (err)
return err;
force_successful_syscall_return();

9
ipc/shm.c
View file

@ -953,7 +953,8 @@ out:
* "raddr" thing points to kernel space, and there has to be a wrapper around
* this.
*/
long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr)
long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr,
unsigned long shmlba)
{
struct shmid_kernel *shp;
unsigned long addr;
@ -973,9 +974,9 @@ long do_shmat(int shmid, char __user *shmaddr, int shmflg, ulong *raddr)
if (shmid < 0)
goto out;
else if ((addr = (ulong)shmaddr)) {
if (addr & (SHMLBA-1)) {
if (addr & (shmlba - 1)) {
if (shmflg & SHM_RND)
addr &= ~(SHMLBA-1); /* round down */
addr &= ~(shmlba - 1); /* round down */
else
#ifndef __ARCH_FORCE_SHMLBA
if (addr & ~PAGE_MASK)
@ -1107,7 +1108,7 @@ SYSCALL_DEFINE3(shmat, int, shmid, char __user *, shmaddr, int, shmflg)
unsigned long ret;
long err;
err = do_shmat(shmid, shmaddr, shmflg, &ret);
err = do_shmat(shmid, shmaddr, shmflg, &ret, SHMLBA);
if (err)
return err;
force_successful_syscall_return();

2
ipc/syscall.c
View file

@ -73,7 +73,7 @@ SYSCALL_DEFINE6(ipc, unsigned int, call, int, first, unsigned long, second,
default: {
unsigned long raddr;
ret = do_shmat(first, (char __user *)ptr,
second, &raddr);
second, &raddr, SHMLBA);
if (ret)
return ret;
return put_user(raddr, (unsigned long __user *) third);