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Kernel: Don't turn I/O errors during sys$execve() into ENOEXEC

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Instead, just propagate whatever the real error was.
This commit is contained in:
Andreas Kling 2021-09-06 13:05:20 +02:00
parent 84addef10f
commit 645e29a88b
Notes: sideshowbarker 2024-07-18 04:37:03 +09:00 
Author: https://github.com/awesomekling
Commit: https://github.com/SerenityOS/serenity/commit/645e29a88b2
1 changed files with 8 additions and 13 deletions
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21
Kernel/Syscalls/execve.cpp
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@ -710,14 +710,14 @@ static Vector<ELF::AuxiliaryValue> generate_auxiliary_vector(FlatPtr load_base,
return auxv;
}
static KResultOr<Vector<String>> find_shebang_interpreter_for_executable(const char first_page[], int nread)
static KResultOr<Vector<String>> find_shebang_interpreter_for_executable(char const first_page[], size_t nread)
{
int word_start = 2;
int word_length = 0;
if (nread > 2 && first_page[0] == '#' && first_page[1] == '!') {
Vector<String> interpreter_words;
for (int i = 2; i < nread; ++i) {
for (size_t i = 2; i < nread; ++i) {
if (first_page[i] == '\n') {
break;
}
@ -773,12 +773,9 @@ KResultOr<RefPtr<FileDescription>> Process::find_elf_interpreter_for_executable(
char first_page[PAGE_SIZE] = {};
auto first_page_buffer = UserOrKernelBuffer::for_kernel_buffer((u8*)&first_page);
auto nread_or_error = interpreter_description->read(first_page_buffer, sizeof(first_page));
if (nread_or_error.is_error())
return ENOEXEC;
nread = nread_or_error.value();
auto nread = TRY(interpreter_description->read(first_page_buffer, sizeof(first_page)));
if (nread < (int)sizeof(ElfW(Ehdr)))
if (nread < sizeof(ElfW(Ehdr)))
return ENOEXEC;
auto elf_header = (ElfW(Ehdr)*)first_page;
@ -847,12 +844,10 @@ KResult Process::exec(String path, Vector<String> arguments, Vector<String> envi
// Read the first page of the program into memory so we can validate the binfmt of it
char first_page[PAGE_SIZE];
auto first_page_buffer = UserOrKernelBuffer::for_kernel_buffer((u8*)&first_page);
auto nread_or_error = description->read(first_page_buffer, sizeof(first_page));
if (nread_or_error.is_error())
return ENOEXEC;
auto nread = TRY(description->read(first_page_buffer, sizeof(first_page)));
// 1) #! interpreted file
auto shebang_result = find_shebang_interpreter_for_executable(first_page, nread_or_error.value());
auto shebang_result = find_shebang_interpreter_for_executable(first_page, nread);
if (!shebang_result.is_error()) {
auto shebang_words = shebang_result.release_value();
auto shebang_path = shebang_words.first();
@ -864,7 +859,7 @@ KResult Process::exec(String path, Vector<String> arguments, Vector<String> envi
// #2) ELF32 for i386
if (nread_or_error.value() < (int)sizeof(ElfW(Ehdr)))
if (nread < sizeof(ElfW(Ehdr)))
return ENOEXEC;
auto main_program_header = (ElfW(Ehdr)*)first_page;
@ -873,7 +868,7 @@ KResult Process::exec(String path, Vector<String> arguments, Vector<String> envi
return ENOEXEC;
}
auto elf_result = find_elf_interpreter_for_executable(path, *main_program_header, nread_or_error.value(), metadata.size);
auto elf_result = find_elf_interpreter_for_executable(path, *main_program_header, nread, metadata.size);
// Assume a static ELF executable by default
RefPtr<FileDescription> interpreter_description;
// We're getting either an interpreter, an error, or KSuccess (i.e. no interpreter but file checks out)