From: kbuild test robot <lkp@intel.com>
To: Kees Cook <keescook@chromium.org>
Cc: kbuild-all@01.org, Johannes Weiner <hannes@cmpxchg.org>,
Andrew Morton <akpm@linux-foundation.org>,
Linux Memory Management List <linux-mm@kvack.org>
Subject: [mmotm:master 253/317] fs/binfmt_elf.c:1140:7: error: 'elf_interpreter' undeclared
Date: Wed, 17 Apr 2019 16:02:31 +0800 [thread overview]
Message-ID: <201904171629.46QP9Nkp%lkp@intel.com> (raw)
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tree: git://git.cmpxchg.org/linux-mmotm.git master
head: def6be39d5629b938faba788330db817d19a04da
commit: 8e5e08d49bf73afad16199d68c5e61a64f5df69d [253/317] fs/binfmt_elf.c: move brk out of mmap when doing direct loader exec
config: i386-randconfig-a1-201915 (attached as .config)
compiler: gcc-4.9 (Debian 4.9.4-2) 4.9.4
reproduce:
git checkout 8e5e08d49bf73afad16199d68c5e61a64f5df69d
# save the attached .config to linux build tree
make ARCH=i386
All errors (new ones prefixed by >>):
fs/binfmt_elf.c: In function 'load_elf_binary':
>> fs/binfmt_elf.c:1140:7: error: 'elf_interpreter' undeclared (first use in this function)
if (!elf_interpreter)
^
fs/binfmt_elf.c:1140:7: note: each undeclared identifier is reported only once for each function it appears in
vim +/elf_interpreter +1140 fs/binfmt_elf.c
1122
1123 retval = create_elf_tables(bprm, &loc->elf_ex,
1124 load_addr, interp_load_addr);
1125 if (retval < 0)
1126 goto out;
1127 /* N.B. passed_fileno might not be initialized? */
1128 current->mm->end_code = end_code;
1129 current->mm->start_code = start_code;
1130 current->mm->start_data = start_data;
1131 current->mm->end_data = end_data;
1132 current->mm->start_stack = bprm->p;
1133
1134 /*
1135 * When executing a loader directly (ET_DYN without Interp), move
1136 * the brk area out of the mmap region (since it grows up, and may
1137 * collide early with the stack growing down), and into the unused
1138 * ELF_ET_DYN_BASE region.
1139 */
> 1140 if (!elf_interpreter)
1141 current->mm->brk = current->mm->start_brk = ELF_ET_DYN_BASE;
1142
1143 if ((current->flags & PF_RANDOMIZE) && (randomize_va_space > 1)) {
1144 current->mm->brk = current->mm->start_brk =
1145 arch_randomize_brk(current->mm);
1146 #ifdef compat_brk_randomized
1147 current->brk_randomized = 1;
1148 #endif
1149 }
1150
1151 if (current->personality & MMAP_PAGE_ZERO) {
1152 /* Why this, you ask??? Well SVr4 maps page 0 as read-only,
1153 and some applications "depend" upon this behavior.
1154 Since we do not have the power to recompile these, we
1155 emulate the SVr4 behavior. Sigh. */
1156 error = vm_mmap(NULL, 0, PAGE_SIZE, PROT_READ | PROT_EXEC,
1157 MAP_FIXED | MAP_PRIVATE, 0);
1158 }
1159
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