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sys_linux: report if CAP_SYS_TIME is not present

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Instead of having adjtimex just fail with a permission issue
improve the error messaging by warning for the lack of
CAP_SYS_TIME on SYS_Linux_Initialise.

Message will look like (instead of only the latter message):
 CAP_SYS_TIME not present
 adjtimex(0x8001) failed : Operation not permitted

Signed-off-by: Christian Ehrhardt <christian.ehrhardt@canonical.com>
This commit is contained in:
Christian Ehrhardt
2018-03-14 15:05:29 +01:00
committed by Miroslav Lichvar
parent aa4228bf1b
commit 02098ed830
1 changed files with 14 additions and 0 deletions
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14
sys_linux.c
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@@ -380,6 +380,18 @@ test_step_offset(void)
return 1; return 1;
} }
/* ================================================== */
static void
report_time_adjust_blockers(void)
{
#ifdef FEAT_PRIVDROP
if (CAP_IS_SUPPORTED(CAP_SYS_TIME) && cap_get_bound(CAP_SYS_TIME))
return;
LOG(LOGS_WARN, "CAP_SYS_TIME not present");
#endif
}
/* ================================================== */ /* ================================================== */
/* Initialisation code for this module */ /* Initialisation code for this module */
@@ -388,6 +400,8 @@ SYS_Linux_Initialise(void)
{ {
get_version_specific_details(); get_version_specific_details();
report_time_adjust_blockers();
reset_adjtime_offset(); reset_adjtime_offset();
if (have_setoffset && !test_step_offset()) { if (have_setoffset && !test_step_offset()) {