From 32de61e81a64c8bb2cd23e3476f00433692f8e59 Mon Sep 17 00:00:00 2001 From: Rich Felker Date: Sat, 25 Jun 2011 22:36:21 -0400 Subject: [PATCH] fix some symbol resolution issues in dynamic linker 1. search was wrongly beginning with lib itself rather than dso head 2. inconsistent resolution of function pointers for functions in plt --- arch/i386/reloc.h | 1 + arch/x86_64/reloc.h | 1 + src/ldso/dynlink.c | 8 ++++---- 3 files changed, 6 insertions(+), 4 deletions(-) diff --git a/arch/i386/reloc.h b/arch/i386/reloc.h index 3ca9d11d..490113a0 100644 --- a/arch/i386/reloc.h +++ b/arch/i386/reloc.h @@ -4,6 +4,7 @@ #define ETC_LDSO_PATH "/etc/ld-musl-i386.path" #define IS_COPY(x) ((x)==R_386_COPY) +#define IS_PLT(x) ((x)==R_386_JMP_SLOT) static inline void do_single_reloc(size_t *reloc_addr, int type, size_t sym_val, size_t sym_size, unsigned char *base_addr, size_t addend) { diff --git a/arch/x86_64/reloc.h b/arch/x86_64/reloc.h index 6642fdd4..b0bbfb3e 100644 --- a/arch/x86_64/reloc.h +++ b/arch/x86_64/reloc.h @@ -5,6 +5,7 @@ #define ETC_LDSO_PATH "/etc/ld-musl-x86_64.path" #define IS_COPY(x) ((x)==R_X86_64_COPY) +#define IS_PLT(x) ((x)==R_X86_64_JUMP_SLOT) static inline void do_single_reloc(size_t *reloc_addr, int type, size_t sym_val, size_t sym_size, unsigned char *base_addr, size_t addend) { diff --git a/src/ldso/dynlink.c b/src/ldso/dynlink.c index 472e389d..9e9415ca 100644 --- a/src/ldso/dynlink.c +++ b/src/ldso/dynlink.c @@ -114,7 +114,7 @@ static void do_relocs(unsigned char *base, size_t *rel, size_t rel_size, size_t sym = syms + sym_index; name = strings + sym->st_name; ctx = IS_COPY(type) ? dso->next : dso; - sym_val = (size_t)find_sym(ctx, name, 1); + sym_val = (size_t)find_sym(ctx, name, IS_PLT(type)); sym_size = sym->st_size; } do_single_reloc(reloc_addr, type, sym_val, sym_size, base, rel[2]); @@ -335,11 +335,11 @@ static void reloc_all(struct dso *p) if (p->relocated) continue; decode_vec(p->dynv, dyn, DYN_CNT); do_relocs(p->base, (void *)(p->base+dyn[DT_JMPREL]), dyn[DT_PLTRELSZ], - 2+(dyn[DT_PLTREL]==DT_RELA), p->syms, p->strings, p); + 2+(dyn[DT_PLTREL]==DT_RELA), p->syms, p->strings, head); do_relocs(p->base, (void *)(p->base+dyn[DT_REL]), dyn[DT_RELSZ], - 2, p->syms, p->strings, p); + 2, p->syms, p->strings, head); do_relocs(p->base, (void *)(p->base+dyn[DT_RELA]), dyn[DT_RELASZ], - 3, p->syms, p->strings, p); + 3, p->syms, p->strings, head); p->relocated = 1; } } -- 2.25.1