Cap shmmax at INT_MAX in compat shminfo

The value of shmmax may be larger than will fit in the struct used by
the 32bit compat version of sys_shmctl. This change mirrors what the
normal sys_shmctl does when called with the old IPC_INFO command.

Signed-off-by: Guy Streeter <streeter@redhat.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>

1 files changed, 4 insertions, 0 deletions

diff --git a/ipc/compat.c b/ipc/compat.c
index fa18141539fb..8b44aa9a7c95 100644
--- a/ipc/compat.c
+++ b/ipc/compat.c
@@ -542,6 +542,8 @@ static inline int put_compat_shminfo64(struct shminfo64 *smi,
 
         if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
                 return -EFAULT;
+        if (smi->shmmax > INT_MAX)
+                smi->shmmax = INT_MAX;
         err  = __put_user(smi->shmmax, &up64->shmmax);
         err |= __put_user(smi->shmmin, &up64->shmmin);
         err |= __put_user(smi->shmmni, &up64->shmmni);
@@ -557,6 +559,8 @@ static inline int put_compat_shminfo(struct shminfo64 *smi,
 
         if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
                 return -EFAULT;
+        if (smi->shmmax > INT_MAX)
+                smi->shmmax = INT_MAX;
         err  = __put_user(smi->shmmax, &up->shmmax);
         err |= __put_user(smi->shmmin, &up->shmmin);
         err |= __put_user(smi->shmmni, &up->shmmni);