unmerge 626482 reassign 650234 fakechroot 2.15-1 severity 650234 important tags 650234 + upstream quit
Elliott Mitchell wrote: > user@host:/$ ls > Segmentation fault > user@host:/$ /lib/ld-linux.so.2 ls > ls: error while loading shared libraries: ls: cannot open shared object file: > No such file or directory > user@host:/$ /lib/ld-linux.so.2 /bin/ls > bin debootstrap etc lib proc sbin sys usr [...] > So, something along these lines is possible. Thanks. Indeed, ideally fakechroot's execve should look up the interpreter filename from the ELF .interp section, map it according to the faked chroot, and set argv[0]. The hard part is the ELF parsing. Hints for inspiration[1]: git://github.com/NixOS/patchelf.git https://fedorahosted.org/elfutils/ Doable, though it seems a little too much like work for me to actually do it. ;-) Reassigning because I can't imagine glibc changing its compatibility requirements any time soon. Hope that helps, Jonathan [1] some pseudocode to experiment with for your amusement: diff --git i/src/execve.c w/src/execve.c index 60351177..70d0a9ea 100644 --- i/src/execve.c +++ w/src/execve.c @@ -71,6 +71,25 @@ static int try_cmd_subst (char * env, const char * filename, char * cmd_subst) return 0; } +static int get_elf_interp(const char * filename, char * buf, size_t buflen) +{ + int num_sections = num_sections(); /* header->e_shnum */ + int i; + + for (i = 0; i < num_sections; i++) { + string section_name = section_names + section_header[i].sh_name; + if (section_name == ".interp") /* found it! */ + break; + } + if (i == num_sections) + return -1; + + // found .interp section + size_t offset = section_hdr.sh_offset; + size_t size = section_hdr.sh_size; + ... +} + wrapper(execve, int, (const char * filename, char * const argv [], char * const envp [])) { @@ -195,8 +214,11 @@ wrapper(execve, int, (const char * filename, char * const argv [], char * const } /* No hashbang in argv */ - if (hashbang[0] != '#' || hashbang[1] != '!') - return nextcall(execve)(filename, argv, newenvp); + if (hashbang[0] != '#' || hashbang[1] != '!') { + if (get_elf_interp(filename, hashbang + 2, sizeof(hashbang) - 3)) + return nextcall(execve)(filename, argv, newenvp); + i = strlen(hashbang); + } /* For hashbang we must fix argv[0] */ hashbang[i] = hashbang[i+1] = 0; -- To UNSUBSCRIBE, email to debian-bugs-dist-requ...@lists.debian.org with a subject of "unsubscribe". Trouble? Contact listmas...@lists.debian.org
