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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>
This commit is contained in:
Guy Streeter 2007-05-08 00:25:12 -07:00 committed by Linus Torvalds
parent ee527cd3a2
commit af7c693f14
1 changed files with 4 additions and 0 deletions
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4
ipc/compat.c
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@ -542,6 +542,8 @@ static inline int put_compat_shminfo64(struct shminfo64 *smi,
if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64))) if (!access_ok(VERIFY_WRITE, up64, sizeof(*up64)))
return -EFAULT; return -EFAULT;
if (smi->shmmax > INT_MAX)
smi->shmmax = INT_MAX;
err = __put_user(smi->shmmax, &up64->shmmax); err = __put_user(smi->shmmax, &up64->shmmax);
err |= __put_user(smi->shmmin, &up64->shmmin); err |= __put_user(smi->shmmin, &up64->shmmin);
err |= __put_user(smi->shmmni, &up64->shmmni); 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))) if (!access_ok(VERIFY_WRITE, up, sizeof(*up)))
return -EFAULT; return -EFAULT;
if (smi->shmmax > INT_MAX)
smi->shmmax = INT_MAX;
err = __put_user(smi->shmmax, &up->shmmax); err = __put_user(smi->shmmax, &up->shmmax);
err |= __put_user(smi->shmmin, &up->shmmin); err |= __put_user(smi->shmmin, &up->shmmin);
err |= __put_user(smi->shmmni, &up->shmmni); err |= __put_user(smi->shmmni, &up->shmmni);