The patch titled
Subject: fs/binfmt_elf.c: allocate less for static executable
has been added to the -mm tree. Its filename is
elf-allocate-less-for-static-executable.patch
This patch should soon appear at
http://ozlabs.org/~akpm/mmots/broken-out/elf-allocate-less-for-static-executable.patch
and later at
http://ozlabs.org/~akpm/mmotm/broken-out/elf-allocate-less-for-static-executable.patch
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The -mm tree is included into linux-next and is updated
there every 3-4 working days
------------------------------------------------------
From: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Subject: fs/binfmt_elf.c: allocate less for static executable
PT_INTERP ELF header can be spared if executable is static.
Link: http://lkml.kernel.org/r/20200219185012.GB4871@avx2
Signed-off-by: Alexey Dobriyan <adobriyan@xxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/binfmt_elf.c | 19 ++++++++++---------
1 file changed, 10 insertions(+), 9 deletions(-)
--- a/fs/binfmt_elf.c~elf-allocate-less-for-static-executable
+++ a/fs/binfmt_elf.c
@@ -698,17 +698,11 @@ static int load_elf_binary(struct linux_
unsigned long reloc_func_desc __maybe_unused = 0;
int executable_stack = EXSTACK_DEFAULT;
struct elfhdr *elf_ex = (struct elfhdr *)bprm->buf;
- struct elfhdr *interp_elf_ex;
+ struct elfhdr *interp_elf_ex = NULL;
struct arch_elf_state arch_state = INIT_ARCH_ELF_STATE;
struct mm_struct *mm;
struct pt_regs *regs;
- interp_elf_ex = kmalloc(sizeof(*interp_elf_ex), GFP_KERNEL);
- if (!interp_elf_ex) {
- retval = -ENOMEM;
- goto out_ret;
- }
-
retval = -ENOEXEC;
/* First of all, some simple consistency checks */
if (memcmp(elf_ex->e_ident, ELFMAG, SELFMAG) != 0)
@@ -768,6 +762,12 @@ static int load_elf_binary(struct linux_
*/
would_dump(bprm, interpreter);
+ interp_elf_ex = kmalloc(sizeof(*interp_elf_ex), GFP_KERNEL);
+ if (!interp_elf_ex) {
+ retval = -ENOMEM;
+ goto out_free_ph;
+ }
+
/* Get the exec headers */
retval = elf_read(interpreter, interp_elf_ex,
sizeof(*interp_elf_ex), 0);
@@ -1073,6 +1073,8 @@ out_free_interp:
allow_write_access(interpreter);
fput(interpreter);
+
+ kfree(interp_elf_ex);
} else {
elf_entry = e_entry;
if (BAD_ADDR(elf_entry)) {
@@ -1151,12 +1153,11 @@ out_free_interp:
start_thread(regs, elf_entry, bprm->p);
retval = 0;
out:
- kfree(interp_elf_ex);
-out_ret:
return retval;
/* error cleanup */
out_free_dentry:
+ kfree(interp_elf_ex);
kfree(interp_elf_phdata);
allow_write_access(interpreter);
if (interpreter)
_
Patches currently in -mm which might be from adobriyan@xxxxxxxxx are
ramfs-support-o_tmpfile.patch
elf-delete-loc-variable.patch
elf-allocate-less-for-static-executable.patch
elf-dont-free-interpreters-elf-pheaders-on-common-path.patch
