The patch titled
Subject: exec: introduce finalize_exec() before start_thread()
has been removed from the -mm tree. Its filename was
exec-introduce-finalize_exec-before-start_thread.patch
This patch was dropped because it was merged into mainline or a subsystem tree
------------------------------------------------------
From: Kees Cook <keescook@xxxxxxxxxxxx>
Subject: exec: introduce finalize_exec() before start_thread()
Provide a final callback into fs/exec.c before start_thread() takes over,
to handle any last-minute changes, like the coming restoration of the
stack limit.
Link: http://lkml.kernel.org/r/1518638796-20819-3-git-send-email-keescook@xxxxxxxxxxxx
Signed-off-by: Kees Cook <keescook@xxxxxxxxxxxx>
Cc: Andy Lutomirski <luto@xxxxxxxxxx>
Cc: Ben Hutchings <ben@xxxxxxxxxxxxxxx>
Cc: Ben Hutchings <ben.hutchings@xxxxxxxxxxxxxxx>
Cc: Brad Spengler <spender@xxxxxxxxxxxxxx>
Cc: Greg KH <greg@xxxxxxxxx>
Cc: Hugh Dickins <hughd@xxxxxxxxxx>
Cc: "Jason A. Donenfeld" <Jason@xxxxxxxxx>
Cc: Laura Abbott <labbott@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Oleg Nesterov <oleg@xxxxxxxxxx>
Cc: Rik van Riel <riel@xxxxxxxxxx>
Cc: Willy Tarreau <w@xxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/binfmt_aout.c | 1 +
fs/binfmt_elf.c | 1 +
fs/binfmt_elf_fdpic.c | 1 +
fs/binfmt_flat.c | 1 +
fs/exec.c | 6 ++++++
include/linux/binfmts.h | 1 +
6 files changed, 11 insertions(+)
diff -puN fs/binfmt_aout.c~exec-introduce-finalize_exec-before-start_thread fs/binfmt_aout.c
--- a/fs/binfmt_aout.c~exec-introduce-finalize_exec-before-start_thread
+++ a/fs/binfmt_aout.c
@@ -330,6 +330,7 @@ beyond_if:
#ifdef __alpha__
regs->gp = ex.a_gpvalue;
#endif
+ finalize_exec(bprm);
start_thread(regs, ex.a_entry, current->mm->start_stack);
return 0;
}
diff -puN fs/binfmt_elf.c~exec-introduce-finalize_exec-before-start_thread fs/binfmt_elf.c
--- a/fs/binfmt_elf.c~exec-introduce-finalize_exec-before-start_thread
+++ a/fs/binfmt_elf.c
@@ -1155,6 +1155,7 @@ static int load_elf_binary(struct linux_
ELF_PLAT_INIT(regs, reloc_func_desc);
#endif
+ finalize_exec(bprm);
start_thread(regs, elf_entry, bprm->p);
retval = 0;
out:
diff -puN fs/binfmt_elf_fdpic.c~exec-introduce-finalize_exec-before-start_thread fs/binfmt_elf_fdpic.c
--- a/fs/binfmt_elf_fdpic.c~exec-introduce-finalize_exec-before-start_thread
+++ a/fs/binfmt_elf_fdpic.c
@@ -463,6 +463,7 @@ static int load_elf_fdpic_binary(struct
dynaddr);
#endif
+ finalize_exec(bprm);
/* everything is now ready... get the userspace context ready to roll */
entryaddr = interp_params.entry_addr ?: exec_params.entry_addr;
start_thread(regs, entryaddr, current->mm->start_stack);
diff -puN fs/binfmt_flat.c~exec-introduce-finalize_exec-before-start_thread fs/binfmt_flat.c
--- a/fs/binfmt_flat.c~exec-introduce-finalize_exec-before-start_thread
+++ a/fs/binfmt_flat.c
@@ -994,6 +994,7 @@ static int load_flat_binary(struct linux
FLAT_PLAT_INIT(regs);
#endif
+ finalize_exec(bprm);
pr_debug("start_thread(regs=0x%p, entry=0x%lx, start_stack=0x%lx)\n",
regs, start_addr, current->mm->start_stack);
start_thread(regs, start_addr, current->mm->start_stack);
diff -puN fs/exec.c~exec-introduce-finalize_exec-before-start_thread fs/exec.c
--- a/fs/exec.c~exec-introduce-finalize_exec-before-start_thread
+++ a/fs/exec.c
@@ -1384,6 +1384,12 @@ void setup_new_exec(struct linux_binprm
}
EXPORT_SYMBOL(setup_new_exec);
+/* Runs immediately before start_thread() takes over. */
+void finalize_exec(struct linux_binprm *bprm)
+{
+}
+EXPORT_SYMBOL(finalize_exec);
+
/*
* Prepare credentials and lock ->cred_guard_mutex.
* install_exec_creds() commits the new creds and drops the lock.
diff -puN include/linux/binfmts.h~exec-introduce-finalize_exec-before-start_thread include/linux/binfmts.h
--- a/include/linux/binfmts.h~exec-introduce-finalize_exec-before-start_thread
+++ a/include/linux/binfmts.h
@@ -118,6 +118,7 @@ extern int __must_check remove_arg_zero(
extern int search_binary_handler(struct linux_binprm *);
extern int flush_old_exec(struct linux_binprm * bprm);
extern void setup_new_exec(struct linux_binprm * bprm);
+extern void finalize_exec(struct linux_binprm *bprm);
extern void would_dump(struct linux_binprm *, struct file *);
extern int suid_dumpable;
_
Patches currently in -mm which might be from keescook@xxxxxxxxxxxx are
rslib-remove-vlas-by-setting-upper-bound-on-nroots.patch
fork-unconditionally-clear-stack-on-fork.patch
exofs-avoid-vla-in-structures.patch
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