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dm ima: add a warning in dm_init if duplicate ima events are not measured

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The end-users of DM devices/targets may remove and re-create the same
device multiple times.  IMA does not measure such duplicate events if the
configuration CONFIG_IMA_DISABLE_HTABLE is set to 'n'.
To avoid confusion, the end-users need some indication on the client
if that configuration option is disabled.

Add a one-time warning during dm_init() if CONFIG_IMA_DISABLE_HTABLE
is set to 'n', to notify the end-users that duplicate events will not
be measured in the ima log. Also cleanup some whitespace in dm_init().

Signed-off-by: Tushar Sugandhi <tusharsu@linux.microsoft.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
This commit is contained in:
Tushar Sugandhi 2021-08-13 14:37:59 -07:00 committed by Mike Snitzer
parent 9c2adfa6ba
commit f1cd6cb24b
1 changed files with 6 additions and 3 deletions
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9
drivers/md/dm.c
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@ -262,9 +262,13 @@ static void (*_exits[])(void) = {
static int __init dm_init(void) static int __init dm_init(void)
{ {
const int count = ARRAY_SIZE(_inits); const int count = ARRAY_SIZE(_inits);
int r, i; int r, i;
#if (IS_ENABLED(CONFIG_IMA) && !IS_ENABLED(CONFIG_IMA_DISABLE_HTABLE))
DMWARN("CONFIG_IMA_DISABLE_HTABLE is disabled."
" Duplicate IMA measurements will not be recorded in the IMA log.");
#endif
for (i = 0; i < count; i++) { for (i = 0; i < count; i++) {
r = _inits[i](); r = _inits[i]();
if (r) if (r)
@ -272,8 +276,7 @@ static int __init dm_init(void)
} }
return 0; return 0;
bad:
bad:
while (i--) while (i--)
_exits[i](); _exits[i]();