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Do not try to set not owned capabilities

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If the process has already less capabilities than we are trying to keep,
do not try to set them.
This commit is contained in:
Christian Göttsche 2021-01-12 11:39:10 +01:00 committed by BenBE
parent 5fde0e0127
commit ceee96dcba
1 changed files with 35 additions and 8 deletions
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43
htop.c
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@ -115,7 +115,7 @@ static CommandLineSettings parseArguments(int argc, char** argv) {
.highlightChanges = false,
.highlightDelaySecs = -1,
#ifdef HAVE_LIBCAP
.capabilitiesMode = (geteuid() == 0) ? CAP_MODE_BASIC : CAP_MODE_NONE,
.capabilitiesMode = CAP_MODE_BASIC,
#endif
};
@ -325,7 +325,7 @@ static int dropCapabilities(enum CapMode mode) {
#endif
};
const cap_value_t* const keepcaps = (mode == CAP_MODE_BASIC) ? keepcapsBasic : keepcapsStrict;
const int ncap = (mode == CAP_MODE_BASIC) ? ARRAYSIZE(keepcapsBasic) : ARRAYSIZE(keepcapsStrict);
const size_t ncap = (mode == CAP_MODE_BASIC) ? ARRAYSIZE(keepcapsBasic) : ARRAYSIZE(keepcapsStrict);
cap_t caps = cap_init();
if (caps == NULL) {
@ -339,24 +339,51 @@ static int dropCapabilities(enum CapMode mode) {
return -1;
}
if (cap_set_flag(caps, CAP_PERMITTED, ncap, keepcaps, CAP_SET) < 0) {
fprintf(stderr, "Error: can not set permitted capabilities: %s\n", strerror(errno));
cap_t currCaps = cap_get_proc();
if (currCaps == NULL) {
fprintf(stderr, "Error: can not get current process capabilities: %s\n", strerror(errno));
cap_free(caps);
return -1;
}
if (cap_set_flag(caps, CAP_EFFECTIVE, ncap, keepcaps, CAP_SET) < 0) {
fprintf(stderr, "Error: can not set effective capabilities: %s\n", strerror(errno));
cap_free(caps);
return -1;
for (size_t i = 0; i < ncap; i++) {
if (!CAP_IS_SUPPORTED(keepcaps[i]))
continue;
cap_flag_value_t current;
if (cap_get_flag(currCaps, keepcaps[i], CAP_PERMITTED, &current) < 0) {
fprintf(stderr, "Error: can not get current value of capability %d: %s\n", keepcaps[i], strerror(errno));
cap_free(currCaps);
cap_free(caps);
return -1;
}
if (current != CAP_SET)
continue;
if (cap_set_flag(caps, CAP_PERMITTED, 1, &keepcaps[i], CAP_SET) < 0) {
fprintf(stderr, "Error: can not set permitted capability %d: %s\n", keepcaps[i], strerror(errno));
cap_free(currCaps);
cap_free(caps);
return -1;
}
if (cap_set_flag(caps, CAP_EFFECTIVE, 1, &keepcaps[i], CAP_SET) < 0) {
fprintf(stderr, "Error: can not set effective capability %d: %s\n", keepcaps[i], strerror(errno));
cap_free(currCaps);
cap_free(caps);
return -1;
}
}
if (cap_set_proc(caps) < 0) {
fprintf(stderr, "Error: can not set process capabilities: %s\n", strerror(errno));
cap_free(currCaps);
cap_free(caps);
return -1;
}
cap_free(currCaps);
cap_free(caps);
return 0;