diff options
| author | Mathieu Desnoyers <[email protected]> | 2012-04-12 12:49:12 -0700 |
|---|---|---|
| committer | Linus Torvalds <[email protected]> | 2012-04-12 13:12:12 -0700 |
| commit | 44e4360fa3384850d65dd36fb4e6e5f2f112709b (patch) | |
| tree | bca5390346511ef308933b9968cdc43ec8569b7f /net/lapb/lapb_timer.c | |
| parent | d833049bd20570cbbadeb5228c579f9f3aaa4e03 (diff) | |
drivers/char/random.c: fix boot id uniqueness race
/proc/sys/kernel/random/boot_id can be read concurrently by userspace
processes. If two (or more) user-space processes concurrently read
boot_id when sysctl_bootid is not yet assigned, a race can occur making
boot_id differ between the reads. Because the whole point of the boot id
is to be unique across a kernel execution, fix this by protecting this
operation with a spinlock.
Given that this operation is not frequently used, hitting the spinlock
on each call should not be an issue.
Signed-off-by: Mathieu Desnoyers <[email protected]>
Cc: "Theodore Ts'o" <[email protected]>
Cc: Matt Mackall <[email protected]>
Signed-off-by: Eric Dumazet <[email protected]>
Cc: Greg Kroah-Hartman <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
Diffstat (limited to 'net/lapb/lapb_timer.c')
0 files changed, 0 insertions, 0 deletions