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fix dl_iterate_phdr in static PIE binaries

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analogous to commit 5bf7eba213, use of
AT_PHDR/PT_PHDR does not actually work to find the program base, and
the method with _DYNAMIC vs PT_DYNAMIC must be used as an alternative.

patch by Shiz, along with testing to confirm that this fixes unwinding
in static PIE.
This commit is contained in:
Rich Felker 2017-04-11 22:10:52 -04:00
parent 1ca597551b
commit b3751c3282
1 changed files with 5 additions and 0 deletions
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5
src/ldso/dl_iterate_phdr.c
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@ -4,6 +4,9 @@
#define AUX_CNT 38
__attribute__((__weak__, __visibility__("hidden")))
extern const size_t _DYNAMIC[];
static int static_dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size_t size, void *data), void *data)
{
unsigned char *p;
@ -20,6 +23,8 @@ static int static_dl_iterate_phdr(int(*callback)(struct dl_phdr_info *info, size
phdr = (void *)p;
if (phdr->p_type == PT_PHDR)
base = aux[AT_PHDR] - phdr->p_vaddr;
if (phdr->p_type == PT_DYNAMIC && _DYNAMIC)
base = (size_t)_DYNAMIC - phdr->p_vaddr;
if (phdr->p_type == PT_TLS)
tls_phdr = phdr;
}