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nsfs: validate extensible ioctls

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Validate extensible ioctls stricter than we do now.

Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Christian Brauner <brauner@kernel.org>
This commit is contained in:
Christian Brauner 2025-09-12 13:52:26 +02:00
parent 4d906371d1
commit f8527a29f4
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GPG key ID: 91C61BC06578DCA2
1 changed files with 3 additions and 1 deletions
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4
fs/nsfs.c
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@ -169,9 +169,11 @@ static bool nsfs_ioctl_valid(unsigned int cmd)
/* Extensible ioctls require some extra handling. */ /* Extensible ioctls require some extra handling. */
switch (_IOC_NR(cmd)) { switch (_IOC_NR(cmd)) {
case _IOC_NR(NS_MNT_GET_INFO): case _IOC_NR(NS_MNT_GET_INFO):
return extensible_ioctl_valid(cmd, NS_MNT_GET_INFO, MNT_NS_INFO_SIZE_VER0);
case _IOC_NR(NS_MNT_GET_NEXT): case _IOC_NR(NS_MNT_GET_NEXT):
return extensible_ioctl_valid(cmd, NS_MNT_GET_NEXT, MNT_NS_INFO_SIZE_VER0);
case _IOC_NR(NS_MNT_GET_PREV): case _IOC_NR(NS_MNT_GET_PREV):
return (_IOC_TYPE(cmd) == _IOC_TYPE(cmd)); return extensible_ioctl_valid(cmd, NS_MNT_GET_PREV, MNT_NS_INFO_SIZE_VER0);
} }
return false; return false;