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| author | Ludvig Michaelsson <ludvig.michaelsson@yubico.com> | 2023-06-21 14:17:43 +0300 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2023-07-01 14:16:26 +0300 |
| commit | 879e79c3aead41b8aa2e91164354b30bd1c4ef3b (patch) | |
| tree | a58afbea228d15797a41edbe90db511b0381588c /drivers/hid | |
| parent | cae85424957884cb5665241b3f12e52f0346d1d6 (diff) | |
| download | linux-879e79c3aead41b8aa2e91164354b30bd1c4ef3b.tar.xz | |
HID: hidraw: fix data race on device refcount
commit 944ee77dc6ec7b0afd8ec70ffc418b238c92f12b upstream.
The hidraw_open() function increments the hidraw device reference
counter. The counter has no dedicated synchronization mechanism,
resulting in a potential data race when concurrently opening a device.
The race is a regression introduced by commit 8590222e4b02 ("HID:
hidraw: Replace hidraw device table mutex with a rwsem"). While
minors_rwsem is intended to protect the hidraw_table itself, by instead
acquiring the lock for writing, the reference counter is also protected.
This is symmetrical to hidraw_release().
Link: https://github.com/systemd/systemd/issues/27947
Fixes: 8590222e4b02 ("HID: hidraw: Replace hidraw device table mutex with a rwsem")
Cc: stable@vger.kernel.org
Signed-off-by: Ludvig Michaelsson <ludvig.michaelsson@yubico.com>
Link: https://lore.kernel.org/r/20230621-hidraw-race-v1-1-a58e6ac69bab@yubico.com
Signed-off-by: Benjamin Tissoires <benjamin.tissoires@redhat.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'drivers/hid')
| -rw-r--r-- | drivers/hid/hidraw.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/drivers/hid/hidraw.c b/drivers/hid/hidraw.c index 197b1e7bf029..b617aada50b0 100644 --- a/drivers/hid/hidraw.c +++ b/drivers/hid/hidraw.c @@ -272,7 +272,12 @@ static int hidraw_open(struct inode *inode, struct file *file) goto out; } - down_read(&minors_rwsem); + /* + * Technically not writing to the hidraw_table but a write lock is + * required to protect the device refcount. This is symmetrical to + * hidraw_release(). + */ + down_write(&minors_rwsem); if (!hidraw_table[minor] || !hidraw_table[minor]->exist) { err = -ENODEV; goto out_unlock; @@ -301,7 +306,7 @@ static int hidraw_open(struct inode *inode, struct file *file) spin_unlock_irqrestore(&hidraw_table[minor]->list_lock, flags); file->private_data = list; out_unlock: - up_read(&minors_rwsem); + up_write(&minors_rwsem); out: if (err < 0) kfree(list); |