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don't fail to map library/executable with zero-length segment maps

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reportedly the GNU linker can emit such segments, causing spurious
failure to load due to mmap with a length of zero producing EINVAL.
no action is required for such a load map (it's effectively a nop in
the program headers table) so just treat it as always successful.
This commit is contained in:
Rich Felker 2021-03-05 11:09:32 -05:00
parent e48e99c112
commit cfdfd5ea3c
1 changed files with 1 additions and 0 deletions
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ldso/dynlink.c
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@ -579,6 +579,7 @@ static void *mmap_fixed(void *p, size_t n, int prot, int flags, int fd, off_t of
{
static int no_map_fixed;
char *q;
if (!n) return p;
if (!no_map_fixed) {
q = mmap(p, n, prot, flags|MAP_FIXED, fd, off);
if (!DL_NOMMU_SUPPORT || q != MAP_FAILED || errno != EINVAL)