diff options
Diffstat (limited to '0003-elf-Remove-unused-l_text_end-field-from-struct-link_.patch')
| -rw-r--r-- | 0003-elf-Remove-unused-l_text_end-field-from-struct-link_.patch | 142 |
1 files changed, 142 insertions, 0 deletions
diff --git a/0003-elf-Remove-unused-l_text_end-field-from-struct-link_.patch b/0003-elf-Remove-unused-l_text_end-field-from-struct-link_.patch new file mode 100644 index 0000000..86e34f8 --- /dev/null +++ b/0003-elf-Remove-unused-l_text_end-field-from-struct-link_.patch @@ -0,0 +1,142 @@ +From 750f19526ae71aac801c77a3f7ef5374890c09b7 Mon Sep 17 00:00:00 2001 +From: Florian Weimer <fweimer@redhat.com> +Date: Fri, 8 Sep 2023 13:02:06 +0200 +Subject: [PATCH 3/5] elf: Remove unused l_text_end field from struct link_map + +It is a left-over from commit 52a01100ad011293197637e42b5be1a479a2 +("elf: Remove ad-hoc restrictions on dlopen callers [BZ #22787]"). + +When backporting commmit 6985865bc3ad5b23147ee73466583dd7fdf65892 +("elf: Always call destructors in reverse constructor order +(bug 30785)"), we can move the l_init_called_next field to this +place, so that the internal GLIBC_PRIVATE ABI does not change. + +Reviewed-by: Carlos O'Donell <carlos@redhat.com> +Tested-by: Carlos O'Donell <carlos@redhat.com> +(cherry picked from commit 53df2ce6885da3d0e89e87dca7b095622296014f) +--- + elf/dl-load.c | 2 +- + elf/dl-load.h | 7 ++----- + elf/rtld.c | 6 ------ + elf/setup-vdso.h | 4 ---- + include/link.h | 2 -- + 5 files changed, 3 insertions(+), 18 deletions(-) + +diff --git a/elf/dl-load.c b/elf/dl-load.c +index 9a87fda9c9..2923b1141d 100644 +--- a/elf/dl-load.c ++++ b/elf/dl-load.c +@@ -1253,7 +1253,7 @@ _dl_map_object_from_fd (const char *name, const char *origname, int fd, + + /* Now process the load commands and map segments into memory. + This is responsible for filling in: +- l_map_start, l_map_end, l_addr, l_contiguous, l_text_end, l_phdr ++ l_map_start, l_map_end, l_addr, l_contiguous, l_phdr + */ + errstring = _dl_map_segments (l, fd, header, type, loadcmds, nloadcmds, + maplength, has_holes, loader); +diff --git a/elf/dl-load.h b/elf/dl-load.h +index ecf6910c68..1d5207694b 100644 +--- a/elf/dl-load.h ++++ b/elf/dl-load.h +@@ -83,14 +83,11 @@ struct loadcmd + + /* This is a subroutine of _dl_map_segments. It should be called for each + load command, some time after L->l_addr has been set correctly. It is +- responsible for setting up the l_text_end and l_phdr fields. */ ++ responsible for setting the l_phdr fields */ + static __always_inline void + _dl_postprocess_loadcmd (struct link_map *l, const ElfW(Ehdr) *header, + const struct loadcmd *c) + { +- if (c->prot & PROT_EXEC) +- l->l_text_end = l->l_addr + c->mapend; +- + if (l->l_phdr == 0 + && c->mapoff <= header->e_phoff + && ((size_t) (c->mapend - c->mapstart + c->mapoff) +@@ -103,7 +100,7 @@ _dl_postprocess_loadcmd (struct link_map *l, const ElfW(Ehdr) *header, + + /* This is a subroutine of _dl_map_object_from_fd. It is responsible + for filling in several fields in *L: l_map_start, l_map_end, l_addr, +- l_contiguous, l_text_end, l_phdr. On successful return, all the ++ l_contiguous, l_phdr. On successful return, all the + segments are mapped (or copied, or whatever) from the file into their + final places in the address space, with the correct page permissions, + and any bss-like regions already zeroed. It returns a null pointer +diff --git a/elf/rtld.c b/elf/rtld.c +index a91e2a4471..5107d16fe3 100644 +--- a/elf/rtld.c ++++ b/elf/rtld.c +@@ -477,7 +477,6 @@ _dl_start_final (void *arg, struct dl_start_final_info *info) + GL(dl_rtld_map).l_real = &GL(dl_rtld_map); + GL(dl_rtld_map).l_map_start = (ElfW(Addr)) &__ehdr_start; + GL(dl_rtld_map).l_map_end = (ElfW(Addr)) _end; +- GL(dl_rtld_map).l_text_end = (ElfW(Addr)) _etext; + /* Copy the TLS related data if necessary. */ + #ifndef DONT_USE_BOOTSTRAP_MAP + # if NO_TLS_OFFSET != 0 +@@ -1119,7 +1118,6 @@ rtld_setup_main_map (struct link_map *main_map) + bool has_interp = false; + + main_map->l_map_end = 0; +- main_map->l_text_end = 0; + /* Perhaps the executable has no PT_LOAD header entries at all. */ + main_map->l_map_start = ~0; + /* And it was opened directly. */ +@@ -1211,8 +1209,6 @@ rtld_setup_main_map (struct link_map *main_map) + allocend = main_map->l_addr + ph->p_vaddr + ph->p_memsz; + if (main_map->l_map_end < allocend) + main_map->l_map_end = allocend; +- if ((ph->p_flags & PF_X) && allocend > main_map->l_text_end) +- main_map->l_text_end = allocend; + + /* The next expected address is the page following this load + segment. */ +@@ -1272,8 +1268,6 @@ rtld_setup_main_map (struct link_map *main_map) + = (char *) main_map->l_tls_initimage + main_map->l_addr; + if (! main_map->l_map_end) + main_map->l_map_end = ~0; +- if (! main_map->l_text_end) +- main_map->l_text_end = ~0; + if (! GL(dl_rtld_map).l_libname && GL(dl_rtld_map).l_name) + { + /* We were invoked directly, so the program might not have a +diff --git a/elf/setup-vdso.h b/elf/setup-vdso.h +index 0079842d1f..d92b12a7aa 100644 +--- a/elf/setup-vdso.h ++++ b/elf/setup-vdso.h +@@ -51,9 +51,6 @@ setup_vdso (struct link_map *main_map __attribute__ ((unused)), + l->l_addr = ph->p_vaddr; + if (ph->p_vaddr + ph->p_memsz >= l->l_map_end) + l->l_map_end = ph->p_vaddr + ph->p_memsz; +- if ((ph->p_flags & PF_X) +- && ph->p_vaddr + ph->p_memsz >= l->l_text_end) +- l->l_text_end = ph->p_vaddr + ph->p_memsz; + } + else + /* There must be no TLS segment. */ +@@ -62,7 +59,6 @@ setup_vdso (struct link_map *main_map __attribute__ ((unused)), + l->l_map_start = (ElfW(Addr)) GLRO(dl_sysinfo_dso); + l->l_addr = l->l_map_start - l->l_addr; + l->l_map_end += l->l_addr; +- l->l_text_end += l->l_addr; + l->l_ld = (void *) ((ElfW(Addr)) l->l_ld + l->l_addr); + elf_get_dynamic_info (l, false, false); + _dl_setup_hash (l); +diff --git a/include/link.h b/include/link.h +index 69bda3ed17..c6af095d87 100644 +--- a/include/link.h ++++ b/include/link.h +@@ -253,8 +253,6 @@ struct link_map + /* Start and finish of memory map for this object. l_map_start + need not be the same as l_addr. */ + ElfW(Addr) l_map_start, l_map_end; +- /* End of the executable part of the mapping. */ +- ElfW(Addr) l_text_end; + + /* Default array for 'l_scope'. */ + struct r_scope_elem *l_scope_mem[4]; +-- +2.33.0 + |