Apply post-1.15.0 fixes; bump version to 1.15.11_15_1

Signed-off-by: Denys Vlasenko <vda.linux@googlemail.com>

9 files changed, 190 insertions, 91 deletions

diff --git a/Makefile b/Makefile
index 51c08a782..ebcdb3bbf 100644
--- a/Makefile
+++ b/Makefile
@@ -1,6 +1,6 @@
 VERSION = 1
 PATCHLEVEL = 15
-SUBLEVEL = 0
+SUBLEVEL = 1
 EXTRAVERSION =
 NAME = Unnamed
 
diff --git a/archival/Config.in b/archival/Config.in
index cae7f20bb..71b953819 100644
--- a/archival/Config.in
+++ b/archival/Config.in
@@ -298,8 +298,8 @@ config FEATURE_LZMA_FAST
 	default n
 	depends on UNLZMA
 	help
-	  This option reduces decompression time by about 25% at the cost of
-	  a 1K bigger binary.
+	  This option reduces decompression time by about 33% at the cost of
+	  a 2K bigger binary.
 
 config UNZIP
 	bool "unzip"
diff --git a/archival/libunarchive/data_extract_all.c b/archival/libunarchive/data_extract_all.c
index 123d1de74..d79ef7cb9 100644
--- a/archival/libunarchive/data_extract_all.c
+++ b/archival/libunarchive/data_extract_all.c
@@ -132,7 +132,7 @@ void FAST_FUNC data_extract_all(archive_handle_t *archive_handle)
 #endif
 			lchown(file_header->name, file_header->uid, file_header->gid);
 	}
-	if (S_ISLNK(file_header->mode)) {
+	if (!S_ISLNK(file_header->mode)) {
 		/* uclibc has no lchmod, glibc is even stranger -
 		 * it has lchmod which seems to do nothing!
 		 * so we use chmod... */
diff --git a/archival/libunarchive/decompress_unlzma.c b/archival/libunarchive/decompress_unlzma.c
index 68085d68c..33e5cd65d 100644
--- a/archival/libunarchive/decompress_unlzma.c
+++ b/archival/libunarchive/decompress_unlzma.c
@@ -8,15 +8,14 @@
  *
  * Licensed under GPLv2 or later, see file LICENSE in this tarball for details.
  */
+
 #include "libbb.h"
 #include "unarchive.h"
 
 #if ENABLE_FEATURE_LZMA_FAST
 #  define speed_inline ALWAYS_INLINE
-#  define size_inline
 #else
 #  define speed_inline
-#  define size_inline ALWAYS_INLINE
 #endif
 
 
@@ -45,8 +44,8 @@ typedef struct {
 #define RC_MODEL_TOTAL_BITS 11
 
 
-/* Called twice: once at startup (LZMA_FAST only) and once in rc_normalize() */
-static size_inline void rc_read(rc_t *rc)
+/* Called twice: once at startup and once in rc_normalize() */
+static void rc_read(rc_t *rc)
 {
 	int buffer_size = safe_read(rc->fd, RC_BUFFER, RC_BUFFER_SIZE);
 	if (buffer_size <= 0)
@@ -55,17 +54,8 @@ static size_inline void rc_read(rc_t *rc)
 	rc->buffer_end = RC_BUFFER + buffer_size;
 }
 
-/* Called twice, but one callsite is in speed_inline'd rc_is_bit_1() */
-static void rc_do_normalize(rc_t *rc)
-{
-	if (rc->ptr >= rc->buffer_end)
-		rc_read(rc);
-	rc->range <<= 8;
-	rc->code = (rc->code << 8) | *rc->ptr++;
-}
-
 /* Called once */
-static ALWAYS_INLINE rc_t* rc_init(int fd) /*, int buffer_size) */
+static rc_t* rc_init(int fd) /*, int buffer_size) */
 {
 	int i;
 	rc_t *rc;
@@ -73,18 +63,17 @@ static ALWAYS_INLINE rc_t* rc_init(int fd) /*, int buffer_size) */
 	rc = xmalloc(sizeof(*rc) + RC_BUFFER_SIZE);
 
 	rc->fd = fd;
+	/* rc->buffer_size = buffer_size; */
+	rc->buffer_end = RC_BUFFER + RC_BUFFER_SIZE;
 	rc->ptr = rc->buffer_end;
 
+	rc->code = 0;
+	rc->range = 0xFFFFFFFF;
 	for (i = 0; i < 5; i++) {
-#if ENABLE_FEATURE_LZMA_FAST
 		if (rc->ptr >= rc->buffer_end)
 			rc_read(rc);
 		rc->code = (rc->code << 8) | *rc->ptr++;
-#else
-		rc_do_normalize(rc);
-#endif
 	}
-	rc->range = 0xFFFFFFFF;
 	return rc;
 }
 
@@ -94,6 +83,14 @@ static ALWAYS_INLINE void rc_free(rc_t *rc)
 	free(rc);
 }
 
+/* Called twice, but one callsite is in speed_inline'd rc_is_bit_0_helper() */
+static void rc_do_normalize(rc_t *rc)
+{
+	if (rc->ptr >= rc->buffer_end)
+		rc_read(rc);
+	rc->range <<= 8;
+	rc->code = (rc->code << 8) | *rc->ptr++;
+}
 static ALWAYS_INLINE void rc_normalize(rc_t *rc)
 {
 	if (rc->range < (1 << RC_TOP_BITS)) {
@@ -101,28 +98,49 @@ static ALWAYS_INLINE void rc_normalize(rc_t *rc)
 	}
 }
 
-/* rc_is_bit_1 is called 9 times */
-static speed_inline int rc_is_bit_1(rc_t *rc, uint16_t *p)
+/* rc_is_bit_0 is called 9 times */
+/* Why rc_is_bit_0_helper exists?
+ * Because we want to always expose (rc->code < rc->bound) to optimizer.
+ * Thus rc_is_bit_0 is always inlined, and rc_is_bit_0_helper is inlined
+ * only if we compile for speed.
+ */
+static speed_inline uint32_t rc_is_bit_0_helper(rc_t *rc, uint16_t *p)
 {
 	rc_normalize(rc);
 	rc->bound = *p * (rc->range >> RC_MODEL_TOTAL_BITS);
-	if (rc->code < rc->bound) {
-		rc->range = rc->bound;
-		*p += ((1 << RC_MODEL_TOTAL_BITS) - *p) >> RC_MOVE_BITS;
-		return 0;
-	}
+	return rc->bound;
+}
+static ALWAYS_INLINE int rc_is_bit_0(rc_t *rc, uint16_t *p)
+{
+	uint32_t t = rc_is_bit_0_helper(rc, p);
+	return rc->code < t;
+}
+
+/* Called ~10 times, but very small, thus inlined */
+static speed_inline void rc_update_bit_0(rc_t *rc, uint16_t *p)
+{
+	rc->range = rc->bound;
+	*p += ((1 << RC_MODEL_TOTAL_BITS) - *p) >> RC_MOVE_BITS;
+}
+static speed_inline void rc_update_bit_1(rc_t *rc, uint16_t *p)
+{
 	rc->range -= rc->bound;
 	rc->code -= rc->bound;
 	*p -= *p >> RC_MOVE_BITS;
-	return 1;
 }
 
 /* Called 4 times in unlzma loop */
-static speed_inline int rc_get_bit(rc_t *rc, uint16_t *p, int *symbol)
+static int rc_get_bit(rc_t *rc, uint16_t *p, int *symbol)
 {
-	int ret = rc_is_bit_1(rc, p);
-	*symbol = *symbol * 2 + ret;
-	return ret;
+	if (rc_is_bit_0(rc, p)) {
+		rc_update_bit_0(rc, p);
+		*symbol *= 2;
+		return 0;
+	} else {
+		rc_update_bit_1(rc, p);
+		*symbol = *symbol * 2 + 1;
+		return 1;
+	}
 }
 
 /* Called once */
@@ -248,13 +266,13 @@ unpack_lzma_stream(int src_fd, int dst_fd)
 	header.dst_size = SWAP_LE64(header.dst_size);
 
 	if (header.dict_size == 0)
-		header.dict_size++;
+		header.dict_size = 1;
 
 	buffer = xmalloc(MIN(header.dst_size, header.dict_size));
 
 	num_probs = LZMA_BASE_SIZE + (LZMA_LIT_SIZE << (lc + lp));
 	p = xmalloc(num_probs * sizeof(*p));
-	num_probs += LZMA_LITERAL - LZMA_BASE_SIZE;
+	num_probs = LZMA_LITERAL + (LZMA_LIT_SIZE << (lc + lp));
 	for (i = 0; i < num_probs; i++)
 		p[i] = (1 << RC_MODEL_TOTAL_BITS) >> 1;
 
@@ -264,8 +282,9 @@ unpack_lzma_stream(int src_fd, int dst_fd)
 		int pos_state = (buffer_pos + global_pos) & pos_state_mask;
 
 		prob = p + LZMA_IS_MATCH + (state << LZMA_NUM_POS_BITS_MAX) + pos_state;
-		if (!rc_is_bit_1(rc, prob)) {
+		if (rc_is_bit_0(rc, prob)) {
 			mi = 1;
+			rc_update_bit_0(rc, prob);
 			prob = (p + LZMA_LITERAL
 			        + (LZMA_LIT_SIZE * ((((buffer_pos + global_pos) & literal_pos_mask) << lc)
 			                            + (previous_byte >> (8 - lc))
@@ -321,21 +340,27 @@ unpack_lzma_stream(int src_fd, int dst_fd)
 			int offset;
 			uint16_t *prob_len;
 
+			rc_update_bit_1(rc, prob);
 			prob = p + LZMA_IS_REP + state;
-			if (!rc_is_bit_1(rc, prob)) {
+			if (rc_is_bit_0(rc, prob)) {
+				rc_update_bit_0(rc, prob);
 				rep3 = rep2;
 				rep2 = rep1;
 				rep1 = rep0;
 				state = state < LZMA_NUM_LIT_STATES ? 0 : 3;
 				prob = p + LZMA_LEN_CODER;
 			} else {
-				prob += LZMA_IS_REP_G0 - LZMA_IS_REP;
-				if (!rc_is_bit_1(rc, prob)) {
+				rc_update_bit_1(rc, prob);
+				prob = p + LZMA_IS_REP_G0 + state;
+				if (rc_is_bit_0(rc, prob)) {
+					rc_update_bit_0(rc, prob);
 					prob = (p + LZMA_IS_REP_0_LONG
 					        + (state << LZMA_NUM_POS_BITS_MAX)
 					        + pos_state
 					);
-					if (!rc_is_bit_1(rc, prob)) {
+					if (rc_is_bit_0(rc, prob)) {
+						rc_update_bit_0(rc, prob);
+
 						state = state < LZMA_NUM_LIT_STATES ? 9 : 11;
 #if ENABLE_FEATURE_LZMA_FAST
 						pos = buffer_pos - rep0;
@@ -347,16 +372,25 @@ unpack_lzma_stream(int src_fd, int dst_fd)
 						len = 1;
 						goto string;
 #endif
+					} else {
+						rc_update_bit_1(rc, prob);
 					}
 				} else {
 					uint32_t distance;
 
-					prob += LZMA_IS_REP_G1 - LZMA_IS_REP_G0;
-					distance = rep1;
-					if (rc_is_bit_1(rc, prob)) {
-						prob += LZMA_IS_REP_G2 - LZMA_IS_REP_G1;
-						distance = rep2;
-						if (rc_is_bit_1(rc, prob)) {
+					rc_update_bit_1(rc, prob);
+					prob = p + LZMA_IS_REP_G1 + state;
+					if (rc_is_bit_0(rc, prob)) {
+						rc_update_bit_0(rc, prob);
+						distance = rep1;
+					} else {
+						rc_update_bit_1(rc, prob);
+						prob = p + LZMA_IS_REP_G2 + state;
+						if (rc_is_bit_0(rc, prob)) {
+							rc_update_bit_0(rc, prob);
+							distance = rep2;
+						} else {
+							rc_update_bit_1(rc, prob);
 							distance = rep3;
 							rep3 = rep2;
 						}
@@ -370,20 +404,24 @@ unpack_lzma_stream(int src_fd, int dst_fd)
 			}
 
 			prob_len = prob + LZMA_LEN_CHOICE;
-			if (!rc_is_bit_1(rc, prob_len)) {
-				prob_len += LZMA_LEN_LOW - LZMA_LEN_CHOICE
-				            + (pos_state << LZMA_LEN_NUM_LOW_BITS);
+			if (rc_is_bit_0(rc, prob_len)) {
+				rc_update_bit_0(rc, prob_len);
+				prob_len = (prob + LZMA_LEN_LOW
+				            + (pos_state << LZMA_LEN_NUM_LOW_BITS));
 				offset = 0;
 				num_bits = LZMA_LEN_NUM_LOW_BITS;
 			} else {
-				prob_len += LZMA_LEN_CHOICE_2 - LZMA_LEN_CHOICE;
-				if (!rc_is_bit_1(rc, prob_len)) {
-					prob_len += LZMA_LEN_MID - LZMA_LEN_CHOICE_2
-					            + (pos_state << LZMA_LEN_NUM_MID_BITS);
+				rc_update_bit_1(rc, prob_len);
+				prob_len = prob + LZMA_LEN_CHOICE_2;
+				if (rc_is_bit_0(rc, prob_len)) {
+					rc_update_bit_0(rc, prob_len);
+					prob_len = (prob + LZMA_LEN_MID
+					            + (pos_state << LZMA_LEN_NUM_MID_BITS));
 					offset = 1 << LZMA_LEN_NUM_LOW_BITS;
 					num_bits = LZMA_LEN_NUM_MID_BITS;
 				} else {
-					prob_len += LZMA_LEN_HIGH - LZMA_LEN_CHOICE_2;
+					rc_update_bit_1(rc, prob_len);
+					prob_len = prob + LZMA_LEN_HIGH;
 					offset = ((1 << LZMA_LEN_NUM_LOW_BITS)
 					          + (1 << LZMA_LEN_NUM_MID_BITS));
 					num_bits = LZMA_LEN_NUM_HIGH_BITS;
@@ -400,20 +438,19 @@ unpack_lzma_stream(int src_fd, int dst_fd)
 				       ((len < LZMA_NUM_LEN_TO_POS_STATES ? len :
 				         LZMA_NUM_LEN_TO_POS_STATES - 1)
 				         << LZMA_NUM_POS_SLOT_BITS);
-				rc_bit_tree_decode(rc, prob,
-					LZMA_NUM_POS_SLOT_BITS, &pos_slot);
-				rep0 = pos_slot;
+				rc_bit_tree_decode(rc, prob, LZMA_NUM_POS_SLOT_BITS,
+								   &pos_slot);
 				if (pos_slot >= LZMA_START_POS_MODEL_INDEX) {
 					num_bits = (pos_slot >> 1) - 1;
 					rep0 = 2 | (pos_slot & 1);
-					prob = p + LZMA_ALIGN;
 					if (pos_slot < LZMA_END_POS_MODEL_INDEX) {
 						rep0 <<= num_bits;
-						prob += LZMA_SPEC_POS - LZMA_ALIGN - 1 + rep0 - pos_slot;
+						prob = p + LZMA_SPEC_POS + rep0 - pos_slot - 1;
 					} else {
 						num_bits -= LZMA_NUM_ALIGN_BITS;
 						while (num_bits--)
 							rep0 = (rep0 << 1) | rc_direct_bit(rc);
+						prob = p + LZMA_ALIGN;
 						rep0 <<= LZMA_NUM_ALIGN_BITS;
 						num_bits = LZMA_NUM_ALIGN_BITS;
 					}
@@ -424,7 +461,8 @@ unpack_lzma_stream(int src_fd, int dst_fd)
 							rep0 |= i;
 						i <<= 1;
 					}
-				}
+				} else
+					rep0 = pos_slot;
 				if (++rep0 == 0)
 					break;
 			}
diff --git a/modutils/modprobe-small.c b/modutils/modprobe-small.c
index 0d78033c3..9ccee5e43 100644
--- a/modutils/modprobe-small.c
+++ b/modutils/modprobe-small.c
@@ -218,6 +218,7 @@ static void parse_module(module_info *info, const char *pathname)
 	bksp(); /* remove last ' ' */
 	appendc('\0');
 	info->aliases = copy_stringbuf();
+	replace(info->aliases, '-', '_');
 
 	/* "dependency1 depandency2" */
 	reset_stringbuf();
diff --git a/networking/httpd.c b/networking/httpd.c
index 956eecaf2..bc081c1bd 100644
--- a/networking/httpd.c
+++ b/networking/httpd.c
@@ -2101,8 +2101,12 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
 		}
 		send_cgi_and_exit(urlcopy, prequest, length, cookie, content_type);
 	}
+#endif
+
+	if (urlp[-1] == '/')
+		strcpy(urlp, index_page);
+	if (stat(tptr, &sb) == 0) {
 #if ENABLE_FEATURE_HTTPD_CONFIG_WITH_SCRIPT_INTERPR
-	{
 		char *suffix = strrchr(tptr, '.');
 		if (suffix) {
 			Htaccess *cur;
@@ -2112,16 +2116,7 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
 				}
 			}
 		}
-	}
 #endif
-	if (prequest != request_GET && prequest != request_HEAD) {
-		send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
-	}
-#endif  /* FEATURE_HTTPD_CGI */
-
-	if (urlp[-1] == '/')
-		strcpy(urlp, index_page);
-	if (stat(tptr, &sb) == 0) {
 		file_size = sb.st_size;
 		last_mod = sb.st_mtime;
 	}
@@ -2135,19 +2130,18 @@ static void handle_incoming_and_exit(const len_and_sockaddr *fromAddr)
 			send_cgi_and_exit("/cgi-bin/index.cgi", prequest, length, cookie, content_type);
 		}
 	}
-#endif
-	/* else {
-	 *	fall through to send_file, it errors out if open fails
-	 * }
-	 */
+	/* else fall through to send_file, it errors out if open fails: */
 
+	if (prequest != request_GET && prequest != request_HEAD) {
+		/* POST for files does not make sense */
+		send_headers_and_exit(HTTP_NOT_IMPLEMENTED);
+	}
 	send_file_and_exit(tptr,
-#if ENABLE_FEATURE_HTTPD_CGI
 		(prequest != request_HEAD ? SEND_HEADERS_AND_BODY : SEND_HEADERS)
+	);
 #else
-		SEND_HEADERS_AND_BODY
+	send_file_and_exit(tptr, SEND_HEADERS_AND_BODY);
 #endif
-	);
 }
 
 /*
diff --git a/networking/inetd.c b/networking/inetd.c
index 331c49441..391bb9ba6 100644
--- a/networking/inetd.c
+++ b/networking/inetd.c
@@ -1031,10 +1031,10 @@ static void reap_child(int sig UNUSED_PARAM)
 				continue;
 			/* One of our "wait" services */
 			if (WIFEXITED(status) && WEXITSTATUS(status))
-				bb_error_msg("%s: exit status 0x%x",
+				bb_error_msg("%s: exit status %u",
 						sep->se_program, WEXITSTATUS(status));
 			else if (WIFSIGNALED(status))
-				bb_error_msg("%s: exit signal 0x%x",
+				bb_error_msg("%s: exit signal %u",
 						sep->se_program, WTERMSIG(status));
 			sep->se_wait = 1;
 			add_fd_to_set(sep->se_fd);
@@ -1119,7 +1119,12 @@ int inetd_main(int argc UNUSED_PARAM, char **argv)
 	else
 		bb_sanitize_stdio();
 	if (!(opt & 4)) {
-		openlog(applet_name, LOG_PID, LOG_DAEMON);
+		/* LOG_NDELAY: connect to syslog daemon NOW.
+		 * Otherwise, we may open syslog socket
+		 * in vforked child, making opened fds and syslog()
+		 * internal state inconsistent.
+		 * This was observed to leak file descriptors. */
+		openlog(applet_name, LOG_PID | LOG_NDELAY, LOG_DAEMON);
 		logmode = LOGMODE_SYSLOG;
 	}
 
@@ -1355,17 +1360,23 @@ int inetd_main(int argc UNUSED_PARAM, char **argv)
 			if (rlim_ofile.rlim_cur != rlim_ofile_cur)
 				if (setrlimit(RLIMIT_NOFILE, &rlim_ofile) < 0)
 					bb_perror_msg("setrlimit");
-			closelog();
+
+			/* closelog(); - WRONG. we are after vfork,
+			 * this may confuse syslog() internal state.
+			 * Let's hope libc sets syslog fd to CLOEXEC...
+			 */
 			xmove_fd(ctrl, STDIN_FILENO);
 			xdup2(STDIN_FILENO, STDOUT_FILENO);
 			/* manpages of inetd I managed to find either say
 			 * that stderr is also redirected to the network,
 			 * or do not talk about redirection at all (!) */
-			xdup2(STDIN_FILENO, STDERR_FILENO);
-			/* NB: among others, this loop closes listening socket
+			if (!sep->se_wait) /* only for usual "tcp nowait" */
+				xdup2(STDIN_FILENO, STDERR_FILENO);
+			/* NB: among others, this loop closes listening sockets
 			 * for nowait stream children */
 			for (sep2 = serv_list; sep2; sep2 = sep2->se_next)
-				maybe_close(sep2->se_fd);
+				if (sep2->se_fd != ctrl)
+					maybe_close(sep2->se_fd);
 			sigaction_set(SIGPIPE, &saved_pipe_handler);
 			restore_sigmask(&omask);
 			BB_EXECVP(sep->se_program, sep->se_argv);
diff --git a/shell/ash.c b/shell/ash.c
index 077f5e5fc..4a163ffbc 100644
--- a/shell/ash.c
+++ b/shell/ash.c
@@ -5810,7 +5810,7 @@ argstr(char *p, int flag, struct strlist *var_str_list)
 	};
 	const char *reject = spclchars;
 	int c;
-	int quotes = flag & (EXP_FULL | EXP_CASE);      /* do CTLESC */
+	int quotes = flag & (EXP_FULL | EXP_CASE | EXP_REDIR); /* do CTLESC */
 	int breakall = flag & EXP_WORD;
 	int inquotes;
 	size_t length;
diff --git a/shell/hush.c b/shell/hush.c
index 7ac29ace2..5794b1ddf 100644
--- a/shell/hush.c
+++ b/shell/hush.c
@@ -58,7 +58,7 @@
  * TODOs:
  *      grep for "TODO" and fix (some of them are easy)
  *      builtins: ulimit
- *      special variables (PWD etc)
+ *      special variables (done: PWD)
  *      follow IFS rules more precisely, including update semantics
  *      export builtin should be special, its arguments are assignments
  *          and therefore expansion of them should be "one-word" expansion:
@@ -1432,6 +1432,13 @@ static int set_local_var(char *str, int flg_export, int local_lvl, int flg_read_
 	return 0;
 }
 
+/* Used at startup and after each cd */
+static void set_pwd_var(int exp)
+{
+	set_local_var(xasprintf("PWD=%s", get_cwd(/*force:*/ 1)),
+		/*exp:*/ exp, /*lvl:*/ 0, /*ro:*/ 0);
+}
+
 static int unset_local_var_len(const char *name, int name_len)
 {
 	struct variable *cur;
@@ -1604,6 +1611,9 @@ static const char* setup_prompt_string(int promptmode)
 		/* Set up the prompt */
 		if (promptmode == 0) { /* PS1 */
 			free((char*)G.PS1);
+			/* bash uses $PWD value, even if it is set by user.
+			 * It uses current dir only if PWD is unset.
+			 * We always use current dir. */
 			G.PS1 = xasprintf("%s %c ", get_cwd(0), (geteuid() != 0) ? '$' : '#');
 			prompt_str = G.PS1;
 		} else
@@ -6432,8 +6442,49 @@ int hush_main(int argc, char **argv)
 		}
 		e++;
 	}
+	/* reinstate HUSH_VERSION */
 	debug_printf_env("putenv '%s'\n", hush_version_str);
-	putenv((char *)hush_version_str); /* reinstate HUSH_VERSION */
+	putenv((char *)hush_version_str);
+
+	/* Export PWD */
+	set_pwd_var(/*exp:*/ 1);
+	/* bash also exports SHLVL and _,
+	 * and sets (but doesn't export) the following variables:
+	 * BASH=/bin/bash
+	 * BASH_VERSINFO=([0]="3" [1]="2" [2]="0" [3]="1" [4]="release" [5]="i386-pc-linux-gnu")
+	 * BASH_VERSION='3.2.0(1)-release'
+	 * HOSTTYPE=i386
+	 * MACHTYPE=i386-pc-linux-gnu
+	 * OSTYPE=linux-gnu
+	 * HOSTNAME=<xxxxxxxxxx>
+	 * PPID=<NNNNN>
+	 * EUID=<NNNNN>
+	 * UID=<NNNNN>
+	 * GROUPS=()
+	 * LINES=<NNN>
+	 * COLUMNS=<NNN>
+	 * BASH_ARGC=()
+	 * BASH_ARGV=()
+	 * BASH_LINENO=()
+	 * BASH_SOURCE=()
+	 * DIRSTACK=()
+	 * PIPESTATUS=([0]="0")
+	 * HISTFILE=/<xxx>/.bash_history
+	 * HISTFILESIZE=500
+	 * HISTSIZE=500
+	 * MAILCHECK=60
+	 * PATH=/usr/gnu/bin:/usr/local/bin:/bin:/usr/bin:.
+	 * SHELL=/bin/bash
+	 * SHELLOPTS=braceexpand:emacs:hashall:histexpand:history:interactive-comments:monitor
+	 * TERM=dumb
+	 * OPTERR=1
+	 * OPTIND=1
+	 * IFS=$' \t\n'
+	 * PS1='\s-\v\$ '
+	 * PS2='> '
+	 * PS4='+ '
+	 */
+
 #if ENABLE_FEATURE_EDITING
 	G.line_input_state = new_line_input_t(FOR_SHELL);
 #endif
@@ -6816,7 +6867,11 @@ static int FAST_FUNC builtin_cd(char **argv)
 		bb_perror_msg("cd: %s", newdir);
 		return EXIT_FAILURE;
 	}
-	get_cwd(1);
+	/* Read current dir (get_cwd(1) is inside) and set PWD.
+	 * Note: do not enforce exporting. If PWD was unset or unexported,
+	 * set it again, but do not export. bash does the same.
+	 */
+	set_pwd_var(/*exp:*/ 0);
 	return EXIT_SUCCESS;
 }