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ANDROID: Add filp_open_block() for zram

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We currently plan to disallow use of filp_open() from drivers in GKI,
however the ZRAM driver still needs it. Add a new GKI-only variant of
filp_open() which only permits a block device to be opened, which can
be exported instead. This keeps ZRAM working but cuts down on drivers
that attempt to open and write files in kernel mode.

Bug: 179220339
Change-Id: Id696b4aaf204b0499ce0a1b6416648670236e570
Signed-off-by: Alistair Delva <adelva@google.com>
This commit is contained in:
Alistair Delva
2021-02-02 17:10:49 -08:00
parent 71037045e8
commit cf8f7947f2
3 changed files with 22 additions and 1 deletions
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include/linux/fs.h
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@@ -2528,6 +2528,7 @@ extern long do_sys_open(int dfd, const char __user *filename, int flags,
umode_t mode);
extern struct file *file_open_name(struct filename *, int, umode_t);
extern struct file *filp_open(const char *, int, umode_t);
extern struct file *filp_open_block(const char *, int, umode_t);
extern struct file *file_open_root(struct dentry *, struct vfsmount *,
const char *, int, umode_t);
extern struct file * dentry_open(const struct path *, int, const struct cred *);