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Fix #4890

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`strings.to_cstring` previously would not check if the buffer could
handle the extra null byte and could lead to segmentation violations
when using the resulting string in an API expecting the terminator.
This commit is contained in:
Feoramund
2025-02-27 18:54:38 -05:00
parent 94152ca701
commit b2e3b34ce0
5 changed files with 39 additions and 16 deletions
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core/os/os2/process_linux.odin
+8 -8
View File
@@ -111,7 +111,7 @@ _process_info_by_pid :: proc(pid: int, selection: Process_Info_Fields, allocator
strings.write_string(&path_builder, "/proc/")
strings.write_int(&path_builder, pid)
proc_fd, errno := linux.open(strings.to_cstring(&path_builder), _OPENDIR_FLAGS)
proc_fd, errno := linux.open(strings.to_cstring(&path_builder) or_return, _OPENDIR_FLAGS)
if errno != .NONE {
err = _get_platform_error(errno)
return
@@ -169,7 +169,7 @@ _process_info_by_pid :: proc(pid: int, selection: Process_Info_Fields, allocator
strings.write_int(&path_builder, pid)
strings.write_string(&path_builder, "/cmdline")
cmdline_bytes, cmdline_err := _read_entire_pseudo_file(strings.to_cstring(&path_builder), temp_allocator())
cmdline_bytes, cmdline_err := _read_entire_pseudo_file(strings.to_cstring(&path_builder) or_return, temp_allocator())
if cmdline_err != nil || len(cmdline_bytes) == 0 {
err = cmdline_err
break cmdline_if
@@ -190,7 +190,7 @@ _process_info_by_pid :: proc(pid: int, selection: Process_Info_Fields, allocator
strings.write_int(&path_builder, pid)
strings.write_string(&path_builder, "/cwd")
cwd, cwd_err = _read_link_cstr(strings.to_cstring(&path_builder), temp_allocator()) // allowed to fail
cwd, cwd_err = _read_link_cstr(strings.to_cstring(&path_builder) or_return, temp_allocator()) // allowed to fail
if cwd_err == nil && .Working_Dir in selection {
info.working_dir = strings.clone(cwd, allocator) or_return
info.fields += {.Working_Dir}
@@ -258,7 +258,7 @@ _process_info_by_pid :: proc(pid: int, selection: Process_Info_Fields, allocator
strings.write_int(&path_builder, pid)
strings.write_string(&path_builder, "/stat")
proc_stat_bytes, stat_err := _read_entire_pseudo_file(strings.to_cstring(&path_builder), temp_allocator())
proc_stat_bytes, stat_err := _read_entire_pseudo_file(strings.to_cstring(&path_builder) or_return, temp_allocator())
if stat_err != nil {
err = stat_err
break stat_if
@@ -330,7 +330,7 @@ _process_info_by_pid :: proc(pid: int, selection: Process_Info_Fields, allocator
strings.write_int(&path_builder, pid)
strings.write_string(&path_builder, "/environ")
if env_bytes, env_err := _read_entire_pseudo_file(strings.to_cstring(&path_builder), temp_allocator()); env_err == nil {
if env_bytes, env_err := _read_entire_pseudo_file(strings.to_cstring(&path_builder) or_return, temp_allocator()); env_err == nil {
env := string(env_bytes)
env_list := make([dynamic]string, allocator) or_return
@@ -418,7 +418,7 @@ _process_start :: proc(desc: Process_Desc) -> (process: Process, err: Error) {
strings.write_byte(&exe_builder, '/')
strings.write_string(&exe_builder, executable_name)
exe_path = strings.to_cstring(&exe_builder)
exe_path = strings.to_cstring(&exe_builder) or_return
if linux.access(exe_path, linux.X_OK) == .NONE {
found = true
break
@@ -430,7 +430,7 @@ _process_start :: proc(desc: Process_Desc) -> (process: Process, err: Error) {
strings.write_string(&exe_builder, "./")
strings.write_string(&exe_builder, executable_name)
exe_path = strings.to_cstring(&exe_builder)
exe_path = strings.to_cstring(&exe_builder) or_return
if linux.access(exe_path, linux.X_OK) != .NONE {
return process, .Not_Exist
}
@@ -594,7 +594,7 @@ _process_state_update_times :: proc(state: ^Process_State) -> (err: Error) {
strings.write_string(&path_builder, "/stat")
stat_buf: []u8
stat_buf, err = _read_entire_pseudo_file(strings.to_cstring(&path_builder), temp_allocator())
stat_buf, err = _read_entire_pseudo_file(strings.to_cstring(&path_builder) or_return, temp_allocator())
if err != nil {
return
}