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authorDmitry Torokhov <dmitry.torokhov@gmail.com>2017-12-13 15:21:22 -0800
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2017-12-21 11:10:33 +0100
commit9b3fa47d4a76b1d606a396455f9bbeee083ef008 (patch)
tree8fe11ace9a6ce42159bc38aa287082706d1cfc85 /lib
parentf57ab9a01a36ef3454333251cc57e3a9948b17bf (diff)
download96b-common-9b3fa47d4a76b1d606a396455f9bbeee083ef008.tar.gz
kobject: fix suppressing modalias in uevents delivered over netlink
The commit 4a336a23d619 ("kobject: copy env blob in one go") optimized constructing uevent data for delivery over netlink by using the raw environment buffer, instead of reconstructing it from individual environment pointers. Unfortunately in doing so it broke suppressing MODALIAS attribute for KOBJ_UNBIND events, as the code that suppressed this attribute only adjusted the environment pointers, but left the buffer itself alone. Let's fix it by making sure the offending attribute is obliterated form the buffer as well. Reported-by: Tariq Toukan <tariqt@mellanox.com> Reported-by: Casey Leedom <leedom@chelsio.com> Fixes: 4a336a23d619 ("kobject: copy env blob in one go") Signed-off-by: Dmitry Torokhov <dmitry.torokhov@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'lib')
-rw-r--r--lib/kobject_uevent.c16
1 files changed, 12 insertions, 4 deletions
diff --git a/lib/kobject_uevent.c b/lib/kobject_uevent.c
index c3e84edc47c9..2615074d3de5 100644
--- a/lib/kobject_uevent.c
+++ b/lib/kobject_uevent.c
@@ -346,7 +346,8 @@ static int kobject_uevent_net_broadcast(struct kobject *kobj,
static void zap_modalias_env(struct kobj_uevent_env *env)
{
static const char modalias_prefix[] = "MODALIAS=";
- int i;
+ size_t len;
+ int i, j;
for (i = 0; i < env->envp_idx;) {
if (strncmp(env->envp[i], modalias_prefix,
@@ -355,11 +356,18 @@ static void zap_modalias_env(struct kobj_uevent_env *env)
continue;
}
- if (i != env->envp_idx - 1)
- memmove(&env->envp[i], &env->envp[i + 1],
- sizeof(env->envp[i]) * env->envp_idx - 1);
+ len = strlen(env->envp[i]) + 1;
+
+ if (i != env->envp_idx - 1) {
+ memmove(env->envp[i], env->envp[i + 1],
+ env->buflen - len);
+
+ for (j = i; j < env->envp_idx - 1; j++)
+ env->envp[j] = env->envp[j + 1] - len;
+ }
env->envp_idx--;
+ env->buflen -= len;
}
}