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Date: Wed, 10 Jul 2013 16:39:01 +0300
From: Timo Teräs <timo.teras@....fi>
To: musl@...ts.openwall.com
Cc: Timo Teräs <timo.teras@....fi>
Subject: [PATCH 3/3] [FYI] fix dynamic linker dso loading
The phdr entries need to be allocated from heap, so later calls
to dl_iterate_phdr work properly. Make sure the ARM unwind info
is not freed.
---
This is not exactly intended to be committed, but shows clearly
what is wrong with the current implementation.
The reclamation fix should be probably something better, as I believe
the same applies to GNU_EH_FRAME phdr.
src/ldso/dynlink.c | 11 ++++++-----
1 file changed, 6 insertions(+), 5 deletions(-)
diff --git a/src/ldso/dynlink.c b/src/ldso/dynlink.c
index 7031d03..a956b39 100644
--- a/src/ldso/dynlink.c
+++ b/src/ldso/dynlink.c
@@ -293,7 +293,7 @@ static void reclaim(unsigned char *base, size_t start, size_t end)
static void reclaim_gaps(unsigned char *base, Phdr *ph, size_t phent, size_t phcnt)
{
for (; phcnt--; ph=(void *)((char *)ph+phent)) {
- if (ph->p_type!=PT_LOAD) continue;
+ if (ph->p_type != PT_LOAD && ph->p_type != PT_ARM_EXIDX) continue;
if ((ph->p_flags&(PF_R|PF_W))!=(PF_R|PF_W)) continue;
reclaim(base, ph->p_vaddr & -PAGE_SIZE, ph->p_vaddr);
reclaim(base, ph->p_vaddr+ph->p_memsz,
@@ -327,7 +327,8 @@ static void *map_library(int fd, struct dso *dso)
eh->e_phoff = sizeof *eh;
}
ph = (void *)((char *)buf + eh->e_phoff);
- dso->phdr = ph;
+ dso->phdr = malloc(phsize);
+ memcpy(dso->phdr, ph, phsize);
dso->phnum = eh->e_phnum;
for (i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) {
if (ph->p_type == PT_DYNAMIC)
@@ -338,7 +339,7 @@ static void *map_library(int fd, struct dso *dso)
dso->tls_len = ph->p_filesz;
dso->tls_size = ph->p_memsz;
}
- if (ph->p_type != PT_LOAD) continue;
+ if (ph->p_type != PT_LOAD && ph->p_type != PT_ARM_EXIDX) continue;
if (ph->p_vaddr < addr_min) {
addr_min = ph->p_vaddr;
off_start = ph->p_offset;
@@ -365,7 +366,7 @@ static void *map_library(int fd, struct dso *dso)
base = map - addr_min;
ph = (void *)((char *)buf + eh->e_phoff);
for (i=eh->e_phnum; i; i--, ph=(void *)((char *)ph+eh->e_phentsize)) {
- if (ph->p_type != PT_LOAD) continue;
+ if (ph->p_type != PT_LOAD && ph->p_type != PT_ARM_EXIDX) continue;
/* Reuse the existing mapping for the lowest-address LOAD */
if ((ph->p_vaddr & -PAGE_SIZE) == addr_min) continue;
this_min = ph->p_vaddr & -PAGE_SIZE;
@@ -651,7 +652,7 @@ static void find_map_range(Phdr *ph, size_t cnt, size_t stride, struct dso *p)
{
size_t min_addr = -1, max_addr = 0;
for (; cnt--; ph = (void *)((char *)ph + stride)) {
- if (ph->p_type != PT_LOAD) continue;
+ if (ph->p_type != PT_LOAD && ph->p_type != PT_ARM_EXIDX) continue;
if (ph->p_vaddr < min_addr)
min_addr = ph->p_vaddr;
if (ph->p_vaddr+ph->p_memsz > max_addr)
--
1.8.3.2
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