diff options
| -rw-r--r-- | ChangeLog | 6 | ||||
| -rw-r--r-- | elf/pldd-xx.c | 32 | ||||
| -rw-r--r-- | elf/pldd.c | 24 |
3 files changed, 43 insertions, 19 deletions
@@ -1,3 +1,9 @@ +2015-04-08 Florian Weimer <fweimer@redhat.com> + + * elf/pldd.c (main): Rewrite to use struct + scratch_buffer instead of extend_alloca. + * elf/pldd-xx.c (find_maps): Likewise. + 2015-04-08 Joseph Myers <joseph@codesourcery.com> * math/auto-libm-test-in: Add more tests of cbrt. diff --git a/elf/pldd-xx.c b/elf/pldd-xx.c index d865739..2f19628 100644 --- a/elf/pldd-xx.c +++ b/elf/pldd-xx.c @@ -186,35 +186,43 @@ E(find_maps) (pid_t pid, void *auxv, size_t auxv_size) printf ("%lu:\t%s\n", (unsigned long int) pid, exe); /* Iterate over the list of objects and print the information. */ - size_t strsize = 256; - char *str = alloca (strsize); + struct scratch_buffer tmpbuf; + scratch_buffer_init (&tmpbuf); + int status = 0; do { struct E(link_map) m; if (pread64 (memfd, &m, sizeof (m), list) != sizeof (m)) { error (0, 0, gettext ("cannot read link map")); - return EXIT_FAILURE; + status = EXIT_FAILURE; + goto out; } EW(Addr) name_offset = m.l_name; again: while (1) { - ssize_t n = pread64 (memfd, str, strsize, name_offset); + ssize_t n = pread64 (memfd, tmpbuf.data, tmpbuf.length, name_offset); if (n == -1) { error (0, 0, gettext ("cannot read object name")); - return EXIT_FAILURE; + status = EXIT_FAILURE; + goto out; } - if (memchr (str, '\0', n) != NULL) + if (memchr (tmpbuf.data, '\0', n) != NULL) break; - str = extend_alloca (str, strsize, strsize * 2); + if (!scratch_buffer_grow (&tmpbuf)) + { + error (0, 0, gettext ("cannot allocate buffer for object name")); + status = EXIT_FAILURE; + goto out; + } } - if (str[0] == '\0' && name_offset == m.l_name + if (((char *)tmpbuf.data)[0] == '\0' && name_offset == m.l_name && m.l_libname != 0) { /* Try the l_libname element. */ @@ -227,14 +235,16 @@ E(find_maps) (pid_t pid, void *auxv, size_t auxv_size) } /* Skip over the executable. */ - if (str[0] != '\0') - printf ("%s\n", str); + if (((char *)tmpbuf.data)[0] != '\0') + printf ("%s\n", (char *)tmpbuf.data); list = m.l_next; } while (list != 0); - return 0; + out: + scratch_buffer_free (&tmpbuf); + return status; } @@ -35,6 +35,7 @@ #include <sys/ptrace.h> #include <sys/stat.h> #include <sys/wait.h> +#include <scratch_buffer.h> #include <ldsodefs.h> #include <version.h> @@ -118,18 +119,25 @@ main (int argc, char *argv[]) if (dfd == -1) error (EXIT_FAILURE, errno, gettext ("cannot open %s"), buf); - size_t exesize = 1024; -#ifdef PATH_MAX - exesize = PATH_MAX; -#endif - exe = alloca (exesize); + struct scratch_buffer exebuf; + scratch_buffer_init (&exebuf); ssize_t nexe; - while ((nexe = readlinkat (dfd, "exe", exe, exesize)) == exesize) - extend_alloca (exe, exesize, 2 * exesize); + while ((nexe = readlinkat (dfd, "exe", + exebuf.data, exebuf.length)) == exebuf.length) + { + if (!scratch_buffer_grow (&exebuf)) + { + nexe = -1; + break; + } + } if (nexe == -1) exe = (char *) "<program name undetermined>"; else - exe[nexe] = '\0'; + { + exe = exebuf.data; + exe[nexe] = '\0'; + } /* Stop all threads since otherwise the list of loaded modules might change while we are reading it. */ |