diff options
| author | Lennart Poettering <lennart@poettering.net> | 2012-09-24 23:22:19 +0200 |
|---|---|---|
| committer | Lennart Poettering <lennart@poettering.net> | 2012-09-24 23:26:46 +0200 |
| commit | 963ddb917de3140308ee62fb642b2307a577a39e (patch) | |
| tree | edfad917a0360b81c69a5030fe13b5716a687e46 /src/shared | |
| parent | 1920e37ef9fec04a1fd882f66bfa7a9a5b91c536 (diff) | |
log: fix repeated invocation of vsnprintf()/vaprintf() in log_struct()
https://bugs.freedesktop.org/show_bug.cgi?id=55213
Diffstat (limited to 'src/shared')
| -rw-r--r-- | src/shared/log.c | 22 | ||||
| -rw-r--r-- | src/shared/macro.h | 43 |
2 files changed, 63 insertions, 2 deletions
diff --git a/src/shared/log.c b/src/shared/log.c index b61845859f..63578683ab 100644 --- a/src/shared/log.c +++ b/src/shared/log.c @@ -27,6 +27,7 @@ #include <sys/socket.h> #include <sys/un.h> #include <stddef.h> +#include <printf.h> #include "log.h" #include "util.h" @@ -705,11 +706,23 @@ int log_struct_internal( va_start(ap, format); while (format && n + 1 < ELEMENTSOF(iovec)) { char *buf; + va_list aq; - if (vasprintf(&buf, format, ap) < 0) { + /* We need to copy the va_list structure, + * since vasprintf() leaves it afterwards at + * an undefined location */ + + va_copy(aq, ap); + if (vasprintf(&buf, format, aq) < 0) { + va_end(aq); r = -ENOMEM; goto finish; } + va_end(aq); + + /* Now, jump enough ahead, so that we point to + * the next format string */ + VA_FORMAT_ADVANCE(format, ap); IOVEC_SET_STRING(iovec[n++], buf); @@ -742,8 +755,11 @@ int log_struct_internal( va_start(ap, format); while (format) { + va_list aq; - vsnprintf(buf, sizeof(buf), format, ap); + va_copy(aq, ap); + vsnprintf(buf, sizeof(buf), format, aq); + va_end(aq); char_array_0(buf); if (startswith(buf, "MESSAGE=")) { @@ -751,6 +767,8 @@ int log_struct_internal( break; } + VA_FORMAT_ADVANCE(format, ap); + format = va_arg(ap, char *); } va_end(ap); diff --git a/src/shared/macro.h b/src/shared/macro.h index c7ce7c87d0..0dd210afa7 100644 --- a/src/shared/macro.h +++ b/src/shared/macro.h @@ -193,4 +193,47 @@ static inline size_t IOVEC_INCREMENT(struct iovec *i, unsigned n, size_t k) { #define _cleanup_closedir_ __attribute__((cleanup(closedirp))) #define _cleanup_umask_ __attribute__((cleanup(umaskp))) +#define VA_FORMAT_ADVANCE(format, ap) do { \ + int _argtypes[64]; \ + size_t _i, _k; \ + _k = parse_printf_format((format), ELEMENTSOF(_argtypes), _argtypes); \ + for (_i = 0; _i < _k; _i++) { \ + if (_argtypes[_i] & PA_FLAG_PTR) { \ + (void) va_arg(ap, void*); \ + continue; \ + } \ + \ + switch (_argtypes[_i]) { \ + case PA_INT: \ + case PA_INT|PA_FLAG_SHORT: \ + case PA_CHAR: \ + (void) va_arg(ap, int); \ + break; \ + case PA_INT|PA_FLAG_LONG: \ + (void) va_arg(ap, long int); \ + break; \ + case PA_INT|PA_FLAG_LONG_LONG: \ + (void) va_arg(ap, long long int); \ + break; \ + case PA_WCHAR: \ + (void) va_arg(ap, wchar_t); \ + break; \ + case PA_WSTRING: \ + case PA_STRING: \ + case PA_POINTER: \ + (void) va_arg(ap, void*); \ + break; \ + case PA_FLOAT: \ + case PA_DOUBLE: \ + (void) va_arg(ap, double); \ + break; \ + case PA_DOUBLE|PA_FLAG_LONG_DOUBLE: \ + (void) va_arg(ap, long double); \ + break; \ + default: \ + assert_not_reached("Unknown format string argument."); \ + } \ + } \ +} while(false) + #include "log.h" |