diff options
Diffstat (limited to 'fs/exec.c')
| -rw-r--r-- | fs/exec.c | 26 |
1 files changed, 20 insertions, 6 deletions
diff --git a/fs/exec.c b/fs/exec.c index c3bec126505b..b7bc63bfb907 100644 --- a/fs/exec.c +++ b/fs/exec.c @@ -486,6 +486,23 @@ static int count_strings_kernel(const char *const *argv) return i; } +static inline int bprm_set_stack_limit(struct linux_binprm *bprm, + unsigned long limit) +{ +#ifdef CONFIG_MMU + bprm->argmin = bprm->p - limit; +#endif + return 0; +} +static inline bool bprm_hit_stack_limit(struct linux_binprm *bprm) +{ +#ifdef CONFIG_MMU + return bprm->p < bprm->argmin; +#else + return false; +#endif +} + /* * Calculate bprm->argmin from: * - _STK_LIM @@ -532,8 +549,7 @@ static int bprm_stack_limits(struct linux_binprm *bprm) return -E2BIG; limit -= ptr_size; - bprm->argmin = bprm->p - limit; - return 0; + return bprm_set_stack_limit(bprm, limit); } /* @@ -571,10 +587,8 @@ static int copy_strings(int argc, struct user_arg_ptr argv, pos = bprm->p; str += len; bprm->p -= len; -#ifdef CONFIG_MMU - if (bprm->p < bprm->argmin) + if (bprm_hit_stack_limit(bprm)) goto out; -#endif while (len > 0) { int offset, bytes_to_copy; @@ -649,7 +663,7 @@ int copy_string_kernel(const char *arg, struct linux_binprm *bprm) /* We're going to work our way backwards. */ arg += len; bprm->p -= len; - if (IS_ENABLED(CONFIG_MMU) && bprm->p < bprm->argmin) + if (bprm_hit_stack_limit(bprm)) return -E2BIG; while (len > 0) { |