[lkml]   [2007]   [Aug]   [22]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
Messages in this thread
Patch in this message
Subject[ review 21/58] CPU online file permission
Is there a reason why the "online" file in the subdirectories for the CPUs
in /sys/devices/system isn't world-readable? I cannot imagine it to be
security relevant especially now that a getcpu() syscall can be used to
determine what CPUa thread runs on.

The file is useful to correctly implement the sysconf() function to return
the number of online CPUs. In the presence of hotplug we currently cannot
provide this information. The patch below should to it.

Signed-off-by: Ulrich Drepper <>
Signed-off-by: Andrew Morton <>
Signed-off-by: Greg Kroah-Hartman <>
Signed-off-by: Willy Tarreau <>
drivers/base/cpu.c | 2 +-
1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/drivers/base/cpu.c b/drivers/base/cpu.c
index 7fd095e..be31b43 100644
--- a/drivers/base/cpu.c
+++ b/drivers/base/cpu.c
@@ -53,7 +53,7 @@ static ssize_t store_online(struct sys_device *dev, const char *buf,
ret = count;
return ret;
-static SYSDEV_ATTR(online, 0600, show_online, store_online);
+static SYSDEV_ATTR(online, 0644, show_online, store_online);

static void __devinit register_cpu_control(struct cpu *cpu)
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to
More majordomo info at
Please read the FAQ at

 \ /
  Last update: 2007-08-22 11:01    [W:0.132 / U:11.184 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site