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Message-ID: <20200219184847.GA4871@avx2>
Date: Wed, 19 Feb 2020 21:48:47 +0300
From: Alexey Dobriyan <adobriyan@...il.com>
To: akpm@...ux-foundation.org
Cc: linux-kernel@...r.kernel.org
Subject: [PATCH 1/3] ELF: delete "loc" variable
"loc" variable became just a wrapper for PT_INTERP ELF header after
main ELF header was moved to "bprm->buf". Delete it.
Signed-off-by: Alexey Dobriyan <adobriyan@...il.com>
---
fs/binfmt_elf.c | 32 +++++++++++++++-----------------
1 file changed, 15 insertions(+), 17 deletions(-)
--- a/fs/binfmt_elf.c
+++ b/fs/binfmt_elf.c
@@ -698,15 +698,13 @@ static int load_elf_binary(struct linux_binprm *bprm)
unsigned long reloc_func_desc __maybe_unused = 0;
int executable_stack = EXSTACK_DEFAULT;
struct elfhdr *elf_ex = (struct elfhdr *)bprm->buf;
- struct {
- struct elfhdr interp_elf_ex;
- } *loc;
+ struct elfhdr *interp_elf_ex;
struct arch_elf_state arch_state = INIT_ARCH_ELF_STATE;
struct mm_struct *mm;
struct pt_regs *regs;
- loc = kmalloc(sizeof(*loc), GFP_KERNEL);
- if (!loc) {
+ interp_elf_ex = kmalloc(sizeof(*interp_elf_ex), GFP_KERNEL);
+ if (!interp_elf_ex) {
retval = -ENOMEM;
goto out_ret;
}
@@ -771,8 +769,8 @@ static int load_elf_binary(struct linux_binprm *bprm)
would_dump(bprm, interpreter);
/* Get the exec headers */
- retval = elf_read(interpreter, &loc->interp_elf_ex,
- sizeof(loc->interp_elf_ex), 0);
+ retval = elf_read(interpreter, interp_elf_ex,
+ sizeof(*interp_elf_ex), 0);
if (retval < 0)
goto out_free_dentry;
@@ -806,25 +804,25 @@ static int load_elf_binary(struct linux_binprm *bprm)
if (interpreter) {
retval = -ELIBBAD;
/* Not an ELF interpreter */
- if (memcmp(loc->interp_elf_ex.e_ident, ELFMAG, SELFMAG) != 0)
+ if (memcmp(interp_elf_ex->e_ident, ELFMAG, SELFMAG) != 0)
goto out_free_dentry;
/* Verify the interpreter has a valid arch */
- if (!elf_check_arch(&loc->interp_elf_ex) ||
- elf_check_fdpic(&loc->interp_elf_ex))
+ if (!elf_check_arch(interp_elf_ex) ||
+ elf_check_fdpic(interp_elf_ex))
goto out_free_dentry;
/* Load the interpreter program headers */
- interp_elf_phdata = load_elf_phdrs(&loc->interp_elf_ex,
+ interp_elf_phdata = load_elf_phdrs(interp_elf_ex,
interpreter);
if (!interp_elf_phdata)
goto out_free_dentry;
/* Pass PT_LOPROC..PT_HIPROC headers to arch code */
elf_ppnt = interp_elf_phdata;
- for (i = 0; i < loc->interp_elf_ex.e_phnum; i++, elf_ppnt++)
+ for (i = 0; i < interp_elf_ex->e_phnum; i++, elf_ppnt++)
switch (elf_ppnt->p_type) {
case PT_LOPROC ... PT_HIPROC:
- retval = arch_elf_pt_proc(&loc->interp_elf_ex,
+ retval = arch_elf_pt_proc(interp_elf_ex,
elf_ppnt, interpreter,
true, &arch_state);
if (retval)
@@ -839,7 +837,7 @@ static int load_elf_binary(struct linux_binprm *bprm)
* the exec syscall.
*/
retval = arch_check_elf(elf_ex,
- !!interpreter, &loc->interp_elf_ex,
+ !!interpreter, interp_elf_ex,
&arch_state);
if (retval)
goto out_free_dentry;
@@ -1055,7 +1053,7 @@ static int load_elf_binary(struct linux_binprm *bprm)
}
if (interpreter) {
- elf_entry = load_elf_interp(&loc->interp_elf_ex,
+ elf_entry = load_elf_interp(interp_elf_ex,
interpreter,
load_bias, interp_elf_phdata);
if (!IS_ERR((void *)elf_entry)) {
@@ -1064,7 +1062,7 @@ static int load_elf_binary(struct linux_binprm *bprm)
* adjustment
*/
interp_load_addr = elf_entry;
- elf_entry += loc->interp_elf_ex.e_entry;
+ elf_entry += interp_elf_ex->e_entry;
}
if (BAD_ADDR(elf_entry)) {
retval = IS_ERR((void *)elf_entry) ?
@@ -1153,7 +1151,7 @@ static int load_elf_binary(struct linux_binprm *bprm)
start_thread(regs, elf_entry, bprm->p);
retval = 0;
out:
- kfree(loc);
+ kfree(interp_elf_ex);
out_ret:
return retval;
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