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sandbox: Assume "openat" syscall is used where "open" is unavailable

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On architectures where Linux does not provide the legacy "open" syscall glibc
necessarily uses "openat" instead.  Omit the unnecessary glibc-version check on
these systems.
This commit is contained in:
Simon South 2021-09-06 09:13:40 -04:00
parent b733f9d6ac
commit 1a40f64be1
1 changed files with 8 additions and 0 deletions
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8
src/lib/sandbox/sandbox.c
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@ -505,7 +505,11 @@ is_libc_at_least(int major, int minor)
static int
libc_uses_openat_for_open(void)
{
#ifdef __NR_open
return is_libc_at_least(2, 26);
#else
return 1;
#endif /* defined(__NR_open) */
}
/* Return true if we think we're running with a libc that uses openat for the
@ -513,9 +517,13 @@ libc_uses_openat_for_open(void)
static int
libc_uses_openat_for_opendir(void)
{
#ifdef __NR_open
// libc 2.27 and above or between 2.15 (inclusive) and 2.22 (exclusive)
return is_libc_at_least(2, 27) ||
(is_libc_at_least(2, 15) && !is_libc_at_least(2, 22));
#else
return 1;
#endif /* defined(__NR_open) */
}
/** Allow a single file to be opened. If <b>use_openat</b> is true,