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Don't bail if there are ambient capabilities #676

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Don't bail if there are ambient capabilities #676

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18 changes: 18 additions & 0 deletions bubblewrap.c
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Original file line number Diff line number Diff line change
Expand Up @@ -742,13 +742,31 @@ drop_all_caps (bool keep_requested_caps)
static bool
has_caps (void)
{
unsigned long cap;
struct __user_cap_header_struct hdr = { _LINUX_CAPABILITY_VERSION_3, 0 };
struct __user_cap_data_struct data[2] = { { 0 } };

if (capget (&hdr, data) < 0)
die_with_error ("capget failed");

#ifdef PR_CAP_AMBIENT
for (cap = 0; cap <= CAP_LAST_CAP; cap++)
{
int is_permitted = (cap < 32) ? (CAP_TO_MASK_0 (cap) & data[0].permitted) : (CAP_TO_MASK_1 (cap) & data[1].permitted);

if (is_permitted)
{
int res = prctl (PR_CAP_AMBIENT, PR_CAP_AMBIENT_IS_SET, cap, 0, 0);
if (res == -1 || !res) /* assume non-ambient if prctl fails */
return 1;
}
}

/* all capabilities were ambient if we reached here */
return 0;
#else
return data[0].permitted != 0 || data[1].permitted != 0;
#endif
}

/* Most of the code here is used both to add caps to the ambient capabilities
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