[PATCH] core-dumping unreadable binaries via PT_INTERP

[powerpc.git] / fs / binfmt_elf.c

diff --git a/fs/binfmt_elf.c b/fs/binfmt_elf.c
index 90461f4..669dbe5 100644 (file)
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -682,6 +682,15 @@ static int load_elf_binary(struct linux_binprm *bprm, struct pt_regs *regs)
                        retval = PTR_ERR(interpreter);
                        if (IS_ERR(interpreter))
                                goto out_free_interp;
+
+                       /*
+                        * If the binary is not readable then enforce
+                        * mm->dumpable = 0 regardless of the interpreter's
+                        * permissions.
+                        */
+                       if (file_permission(interpreter, MAY_READ) < 0)
+                               bprm->interp_flags |= BINPRM_FLAGS_ENFORCE_NONDUMP;
+
                        retval = kernel_read(interpreter, 0, bprm->buf,
                                             BINPRM_BUF_SIZE);
                        if (retval != BINPRM_BUF_SIZE) {