The patch titled
Subject: binfmt_elf_fdpic: fix /proc/<pid>/auxv
has been added to the -mm mm-nonmm-unstable branch. Its filename is
binfmt_elf_fdpic-fix-proc-pid-auxv.patch
This patch will shortly appear at
https://git.kernel.org/pub/scm/linux/kernel/git/akpm/25-new.git/tree/patches/binfmt_elf_fdpic-fix-proc-pid-auxv.patch
This patch will later appear in the mm-nonmm-unstable branch at
git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
Before you just go and hit "reply", please:
a) Consider who else should be cc'ed
b) Prefer to cc a suitable mailing list as well
c) Ideally: find the original patch on the mailing list and do a
reply-to-all to that, adding suitable additional cc's
*** Remember to use Documentation/process/submit-checklist.rst when testing your code ***
The -mm tree is included into linux-next via the mm-everything
branch at git://git.kernel.org/pub/scm/linux/kernel/git/akpm/mm
and is updated there every 2-3 working days
------------------------------------------------------
From: Max Filippov <jcmvbkbc@xxxxxxxxx>
Subject: binfmt_elf_fdpic: fix /proc/<pid>/auxv
Date: Fri, 22 Mar 2024 12:54:18 -0700
Althought FDPIC linux kernel provides /proc/<pid>/auxv files they are
empty because there's no code that initializes mm->saved_auxv in the FDPIC
ELF loader.
Synchronize FDPIC ELF aux vector setup with ELF. Replace entry-by-entry
aux vector copying to userspace with initialization of mm->saved_auxv
first and then copying it to userspace as a whole.
Link: https://lkml.kernel.org/r/20240322195418.2160164-1-jcmvbkbc@xxxxxxxxx
Signed-off-by: Max Filippov <jcmvbkbc@xxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Cc: Christian Brauner <brauner@xxxxxxxxxx>
Cc: Eric Biederman <ebiederm@xxxxxxxxxxxx>
Cc: Jan Kara <jack@xxxxxxx>
Cc: Kees Cook <keescook@xxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/binfmt_elf_fdpic.c | 90 +++++++++++++++++++---------------------
1 file changed, 43 insertions(+), 47 deletions(-)
--- a/fs/binfmt_elf_fdpic.c~binfmt_elf_fdpic-fix-proc-pid-auxv
+++ a/fs/binfmt_elf_fdpic.c
@@ -505,8 +505,9 @@ static int create_elf_fdpic_tables(struc
char *k_platform, *k_base_platform;
char __user *u_platform, *u_base_platform, *p;
int loop;
- int nr; /* reset for each csp adjustment */
unsigned long flags = 0;
+ int ei_index;
+ elf_addr_t *elf_info;
#ifdef CONFIG_MMU
/* In some cases (e.g. Hyper-Threading), we want to avoid L1 evictions
@@ -601,44 +602,24 @@ static int create_elf_fdpic_tables(struc
csp -= sp & 15UL;
sp -= sp & 15UL;
- /* put the ELF interpreter info on the stack */
-#define NEW_AUX_ENT(id, val) \
- do { \
- struct { unsigned long _id, _val; } __user *ent, v; \
- \
- ent = (void __user *) csp; \
- v._id = (id); \
- v._val = (val); \
- if (copy_to_user(ent + nr, &v, sizeof(v))) \
- return -EFAULT; \
- nr++; \
+ /* Create the ELF interpreter info */
+ elf_info = (elf_addr_t *)mm->saved_auxv;
+ /* update AT_VECTOR_SIZE_BASE if the number of NEW_AUX_ENT() changes */
+#define NEW_AUX_ENT(id, val) \
+ do { \
+ *elf_info++ = id; \
+ *elf_info++ = val; \
} while (0)
- nr = 0;
- csp -= 2 * sizeof(unsigned long);
- NEW_AUX_ENT(AT_NULL, 0);
- if (k_platform) {
- nr = 0;
- csp -= 2 * sizeof(unsigned long);
- NEW_AUX_ENT(AT_PLATFORM,
- (elf_addr_t) (unsigned long) u_platform);
- }
-
- if (k_base_platform) {
- nr = 0;
- csp -= 2 * sizeof(unsigned long);
- NEW_AUX_ENT(AT_BASE_PLATFORM,
- (elf_addr_t) (unsigned long) u_base_platform);
- }
-
- if (bprm->have_execfd) {
- nr = 0;
- csp -= 2 * sizeof(unsigned long);
- NEW_AUX_ENT(AT_EXECFD, bprm->execfd);
- }
-
- nr = 0;
- csp -= DLINFO_ITEMS * 2 * sizeof(unsigned long);
+#ifdef ARCH_DLINFO
+ /*
+ * ARCH_DLINFO must come first so PPC can do its special alignment of
+ * AUXV.
+ * update AT_VECTOR_SIZE_ARCH if the number of NEW_AUX_ENT() in
+ * ARCH_DLINFO changes
+ */
+ ARCH_DLINFO;
+#endif
NEW_AUX_ENT(AT_HWCAP, ELF_HWCAP);
#ifdef ELF_HWCAP2
NEW_AUX_ENT(AT_HWCAP2, ELF_HWCAP2);
@@ -659,17 +640,32 @@ static int create_elf_fdpic_tables(struc
NEW_AUX_ENT(AT_EGID, (elf_addr_t) from_kgid_munged(cred->user_ns, cred->egid));
NEW_AUX_ENT(AT_SECURE, bprm->secureexec);
NEW_AUX_ENT(AT_EXECFN, bprm->exec);
-
-#ifdef ARCH_DLINFO
- nr = 0;
- csp -= AT_VECTOR_SIZE_ARCH * 2 * sizeof(unsigned long);
-
- /* ARCH_DLINFO must come last so platform specific code can enforce
- * special alignment requirements on the AUXV if necessary (eg. PPC).
- */
- ARCH_DLINFO;
-#endif
+ if (k_platform) {
+ NEW_AUX_ENT(AT_PLATFORM,
+ (elf_addr_t)(unsigned long)u_platform);
+ }
+ if (k_base_platform) {
+ NEW_AUX_ENT(AT_BASE_PLATFORM,
+ (elf_addr_t)(unsigned long)u_base_platform);
+ }
+ if (bprm->have_execfd) {
+ NEW_AUX_ENT(AT_EXECFD, bprm->execfd);
+ }
#undef NEW_AUX_ENT
+ /* AT_NULL is zero; clear the rest too */
+ memset(elf_info, 0, (char *)mm->saved_auxv +
+ sizeof(mm->saved_auxv) - (char *)elf_info);
+
+ /* And advance past the AT_NULL entry. */
+ elf_info += 2;
+
+ ei_index = elf_info - (elf_addr_t *)mm->saved_auxv;
+ csp -= ei_index * sizeof(elf_addr_t);
+
+ /* Put the elf_info on the stack in the right place. */
+ if (copy_to_user((void __user *)csp, mm->saved_auxv,
+ ei_index * sizeof(elf_addr_t)))
+ return -EFAULT;
/* allocate room for argv[] and envv[] */
csp -= (bprm->envc + 1) * sizeof(elf_caddr_t);
_
Patches currently in -mm which might be from jcmvbkbc@xxxxxxxxx are
binfmt_elf_fdpic-fix-proc-pid-auxv.patch
