diff options
| -rw-r--r-- | fs/binfmt_misc.c | 5 | ||||
| -rw-r--r-- | fs/binfmt_script.c | 4 | ||||
| -rw-r--r-- | fs/exec.c | 15 | ||||
| -rw-r--r-- | include/linux/binfmts.h | 1 |
4 files changed, 23 insertions, 2 deletions
diff --git a/fs/binfmt_misc.c b/fs/binfmt_misc.c index 42b60b04ea0..fb939976d58 100644 --- a/fs/binfmt_misc.c +++ b/fs/binfmt_misc.c @@ -176,7 +176,10 @@ static int load_misc_binary(struct linux_binprm *bprm, struct pt_regs *regs) goto _error; bprm->argc ++; - bprm->interp = iname; /* for binfmt_script */ + /* Update interp in case binfmt_script needs it. */ + retval = bprm_change_interp(iname, bprm); + if (retval < 0) + goto _error; interp_file = open_exec (iname); retval = PTR_ERR (interp_file); diff --git a/fs/binfmt_script.c b/fs/binfmt_script.c index aca9d55afb2..73d51f39c89 100644 --- a/fs/binfmt_script.c +++ b/fs/binfmt_script.c @@ -81,7 +81,9 @@ static int load_script(struct linux_binprm *bprm,struct pt_regs *regs) retval = copy_strings_kernel(1, &i_name, bprm); if (retval) return retval; bprm->argc++; - bprm->interp = interp; + retval = bprm_change_interp(interp, bprm); + if (retval < 0) + return retval; /* * OK, now restart the process with the interpreter's dentry. diff --git a/fs/exec.c b/fs/exec.c index 4afb996086d..0ee94fe2fe3 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -1119,9 +1119,24 @@ void free_bprm(struct linux_binprm *bprm) mutex_unlock(¤t->cred_guard_mutex); abort_creds(bprm->cred); } + /* If a binfmt changed the interp, free it. */ + if (bprm->interp != bprm->filename) + kfree(bprm->interp); kfree(bprm); } +int bprm_change_interp(char *interp, struct linux_binprm *bprm) +{ + /* If a binfmt changed the interp, free it first. */ + if (bprm->interp != bprm->filename) + kfree(bprm->interp); + bprm->interp = kstrdup(interp, GFP_KERNEL); + if (!bprm->interp) + return -ENOMEM; + return 0; +} +EXPORT_SYMBOL(bprm_change_interp); + /* * install the new credentials for this executable */ diff --git a/include/linux/binfmts.h b/include/linux/binfmts.h index 074b620d5d8..8e0957df83b 100644 --- a/include/linux/binfmts.h +++ b/include/linux/binfmts.h @@ -131,6 +131,7 @@ extern int setup_arg_pages(struct linux_binprm * bprm, unsigned long stack_top, int executable_stack); extern int bprm_mm_init(struct linux_binprm *bprm); +extern int bprm_change_interp(char *interp, struct linux_binprm *bprm); extern int copy_strings_kernel(int argc,char ** argv,struct linux_binprm *bprm); extern int prepare_bprm_creds(struct linux_binprm *bprm); extern void install_exec_creds(struct linux_binprm *bprm); |