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authorRich Felker <dalias@aerifal.cx>2021-03-05 11:09:32 -0500
committerRich Felker <dalias@aerifal.cx>2021-03-05 11:13:02 -0500
commitcfdfd5ea3ce14c6abf7fb22a531f3d99518b5a1b (patch)
tree21fa324b6947b11a815baff22278131cd3cddc4c
parente48e99c112246fb580596404074445cb25d7858d (diff)
downloadmusl-master.tar.gz
don't fail to map library/executable with zero-length segment mapsHEADmaster
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.
-rw-r--r--ldso/dynlink.c1
1 files changed, 1 insertions, 0 deletions
diff --git a/ldso/dynlink.c b/ldso/dynlink.c
index 6b868c84..aaadcce0 100644
--- a/ldso/dynlink.c
+++ b/ldso/dynlink.c
@@ -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)