path: root/ipc/compat.c
diff options
authorGuy Streeter <streeter@redhat.com>2007-05-08 00:25:12 -0700
committerLinus Torvalds <torvalds@woody.linux-foundation.org>2007-05-08 11:15:00 -0700
commitaf7c693f146069a1f44739acef9abf1bc27f7247 (patch)
tree424f1417dd3c7ace9323aaca4b7b757c8bb7af03 /ipc/compat.c
parentee527cd3a20c2aeaac17d939e5d011f7a76d69f5 (diff)
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>
Diffstat (limited to 'ipc/compat.c')
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);

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