From 81b9884180af688d29fe915e79788c29eb3a4d62 Mon Sep 17 00:00:00 2001
From: Yuta Imazu <yuta.imazu@gmail.com>
Date: Fri, 8 Nov 2024 21:57:44 +0900
Subject: [PATCH] exec: accept ELF file type ET_DYN

---
 kernel/api/elf.h |  2 ++
 kernel/exec.c    | 14 ++++++++++----
 2 files changed, 12 insertions(+), 4 deletions(-)

diff --git a/kernel/api/elf.h b/kernel/api/elf.h
index 79b33524..6c2b9269 100644
--- a/kernel/api/elf.h
+++ b/kernel/api/elf.h
@@ -37,6 +37,8 @@ typedef uint16_t Elf32_Half;
      (ehdr).e_ident[EI_MAG2] == ELFMAG2 && (ehdr).e_ident[EI_MAG3] == ELFMAG3)
 
 #define ET_EXEC 2
+#define ET_DYN 3
+
 #define EM_386 3
 #define EV_CURRENT 1
 
diff --git a/kernel/exec.c b/kernel/exec.c
index 02ed9051..97259e04 100644
--- a/kernel/exec.c
+++ b/kernel/exec.c
@@ -169,9 +169,7 @@ static int execve(const char* pathname, struct string_vec* argv,
     struct file* file = NULL;
 
     struct kstat stat;
-    mutex_lock(&current->fs->lock);
-    ret = vfs_stat_at(current->fs->cwd, pathname, &stat, 0);
-    mutex_unlock(&current->fs->lock);
+    ret = vfs_stat(pathname, &stat, 0);
     if (IS_ERR(ret))
         goto fail_exe;
     if (!S_ISREG(stat.st_mode)) {
@@ -215,7 +213,7 @@ static int execve(const char* pathname, struct string_vec* argv,
         ehdr->e_ident[EI_DATA] != ELFDATA2LSB ||
         ehdr->e_ident[EI_VERSION] != EV_CURRENT ||
         ehdr->e_ident[EI_ABIVERSION] != 0 || ehdr->e_machine != EM_386 ||
-        ehdr->e_type != ET_EXEC || ehdr->e_version != EV_CURRENT) {
+        ehdr->e_version != EV_CURRENT) {
         ret = -ENOEXEC;
         goto fail_exe;
     }
@@ -227,6 +225,14 @@ static int execve(const char* pathname, struct string_vec* argv,
         ret = -ENOEXEC;
         goto fail_exe;
     }
+    switch (ehdr->e_type) {
+    case ET_EXEC:
+    case ET_DYN:
+        break;
+    default:
+        ret = -ENOEXEC;
+        goto fail_exe;
+    }
 
     struct vm* prev_vm = current->vm;