Revision 44e4360fa3384850d65dd36fb4e6e5f2f112709b authored by Mathieu Desnoyers on 12 April 2012, 19:49:12 UTC, committed by Linus Torvalds on 12 April 2012, 20:12:12 UTC
/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 <mathieu.desnoyers@efficios.com> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Matt Mackall <mpm@selenic.com> Signed-off-by: Eric Dumazet <eric.dumazet@gmail.com> Cc: Greg Kroah-Hartman <greg@kroah.com> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
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| File | Mode | Size |
|---|---|---|
| Kconfig | -rw-r--r-- | 1.7 KB |
| Makefile | -rw-r--r-- | 380 bytes |
| acl.c | -rw-r--r-- | 9.0 KB |
| acl.h | -rw-r--r-- | 1.5 KB |
| balloc.c | -rw-r--r-- | 44.8 KB |
| dir.c | -rw-r--r-- | 17.8 KB |
| ext2.h | -rw-r--r-- | 27.5 KB |
| file.c | -rw-r--r-- | 2.8 KB |
| ialloc.c | -rw-r--r-- | 18.3 KB |
| inode.c | -rw-r--r-- | 44.3 KB |
| ioctl.c | -rw-r--r-- | 4.4 KB |
| namei.c | -rw-r--r-- | 9.3 KB |
| super.c | -rw-r--r-- | 40.9 KB |
| symlink.c | -rw-r--r-- | 1.3 KB |
| xattr.c | -rw-r--r-- | 27.9 KB |
| xattr.h | -rw-r--r-- | 3.4 KB |
| xattr_security.c | -rw-r--r-- | 1.9 KB |
| xattr_trusted.c | -rw-r--r-- | 1.4 KB |
| xattr_user.c | -rw-r--r-- | 1.5 KB |
| xip.c | -rw-r--r-- | 2.0 KB |
| xip.h | -rw-r--r-- | 759 bytes |
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