diff options
author | Kees Cook <keescook@chromium.org> | 2017-07-07 18:57:29 (GMT) |
---|---|---|
committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2017-07-21 05:42:22 (GMT) |
commit | f31c4f65dd09319ba21cf825fa36daf0c1ddf958 (patch) | |
tree | fee3f3b3448d41419a6e261eec6e59d1f7101fca /fs/exec.c | |
parent | fbc877cd08e55f794bdd0d0363bce5147629ef16 (diff) | |
download | linux-f31c4f65dd09319ba21cf825fa36daf0c1ddf958.tar.xz |
exec: Limit arg stack to at most 75% of _STK_LIM
commit da029c11e6b12f321f36dac8771e833b65cec962 upstream.
To avoid pathological stack usage or the need to special-case setuid
execs, just limit all arg stack usage to at most 75% of _STK_LIM (6MB).
Signed-off-by: Kees Cook <keescook@chromium.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'fs/exec.c')
-rw-r--r-- | fs/exec.c | 11 |
1 files changed, 6 insertions, 5 deletions
@@ -215,8 +215,7 @@ static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos, if (write) { unsigned long size = bprm->vma->vm_end - bprm->vma->vm_start; - unsigned long ptr_size; - struct rlimit *rlim; + unsigned long ptr_size, limit; /* * Since the stack will hold pointers to the strings, we @@ -245,14 +244,16 @@ static struct page *get_arg_page(struct linux_binprm *bprm, unsigned long pos, return page; /* - * Limit to 1/4-th the stack size for the argv+env strings. + * Limit to 1/4 of the max stack size or 3/4 of _STK_LIM + * (whichever is smaller) for the argv+env strings. * This ensures that: * - the remaining binfmt code will not run out of stack space, * - the program will have a reasonable amount of stack left * to work from. */ - rlim = current->signal->rlim; - if (size > READ_ONCE(rlim[RLIMIT_STACK].rlim_cur) / 4) + limit = _STK_LIM / 4 * 3; + limit = min(limit, rlimit(RLIMIT_STACK) / 4); + if (size > limit) goto fail; } |