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author | Andrew Burgess <aburgess@redhat.com> | 2023-09-26 17:32:24 +0100 |
---|---|---|
committer | Andrew Burgess <aburgess@redhat.com> | 2023-10-06 13:02:36 +0100 |
commit | f1f0a06d5b34231edd75fbd71a3be79097437f62 (patch) | |
tree | 26d202ddaf31e626e0205e5010a5c1833eb5f629 | |
parent | b75b3eb082b9ee25be98e9cebe1ae5e665a682fc (diff) | |
download | gdb-f1f0a06d5b34231edd75fbd71a3be79097437f62.zip gdb-f1f0a06d5b34231edd75fbd71a3be79097437f62.tar.gz gdb-f1f0a06d5b34231edd75fbd71a3be79097437f62.tar.bz2 |
gdbserver: fix handling of single quote arguments
I noticed that passing arguments containing single quotes to gdbserver
didn't work correctly:
gdb -ex 'set sysroot' --args /tmp/show-args
Reading symbols from /tmp/show-args...
(gdb) target extended-remote | gdbserver --once --multi - /tmp/show-args
Remote debugging using | gdbserver --once --multi - /tmp/show-args
stdin/stdout redirected
Process /tmp/show-args created; pid = 176054
Remote debugging using stdio
Reading symbols from /lib64/ld-linux-x86-64.so.2...
(No debugging symbols found in /lib64/ld-linux-x86-64.so.2)
0x00007ffff7fd3110 in _start () from /lib64/ld-linux-x86-64.so.2
(gdb) set args \'
(gdb) r
The program being debugged has been started already.
Start it from the beginning? (y or n) y
Starting program: /tmp/show-args \'
stdin/stdout redirected
Process /tmp/show-args created; pid = 176088
2 args are:
/tmp/show-args
\'
Done.
[Inferior 1 (process 176088) exited normally]
(gdb) target native
Done. Use the "run" command to start a process.
(gdb) run
Starting program: /tmp/show-args \'
2 args are:
/tmp/show-args
'
Done.
[Inferior 1 (process 176095) exited normally]
(gdb) q
The 'shows-args' program used here just prints the arguments passed to
the inferior.
Notice that when starting the inferior using the extended-remote
target the second argument is "\'", while when running using native
target the argument is "'". The second of these is correct, the \'
used with the "set args" command is just to show GDB that the single
quote is not opening an argument string.
It turns out that the extra backslash is injected on the gdbserver
side when gdbserver processes the arguments that GDB passes it, the
code that does this was added as part of this much larger commit:
commit 2090129c36c7e582943b7d300968d19b46160d84
Date: Thu Dec 22 21:11:11 2016 -0500
Share fork_inferior et al with gdbserver
In this commit I propose removing the specific code that adds what I
believe is a stray backslash. I've extended an existing test to cover
this case, and I now see identical behaviour when using an
extended-remote target as with the native target.
This partially fixes PR gdb/27989, though there are still some issues
with newline handling which I'll address in a later commit.
During review I was pointed to this older series:
https://inbox.sourceware.org/gdb-patches/20211022071933.3478427-1-m.weghorn@posteo.de/
which also includes this fix as part of a larger set of changes. I'm
giving a Co-Authored-By credit to the author of that original series.
I believe this smaller fix brings some benefits on its own, though the
original series does offer additional improvements. Once this is
merged I'll take a look at rebasing and resubmitting the original series.
Bug: https://sourceware.org/bugzilla/show_bug.cgi?id=27989
Co-Authored-By: Michael Weghorn <m.weghorn@posteo.de>
Approved-By: Tom Tromey <tom@tromey.com>
-rw-r--r-- | gdb/testsuite/gdb.base/args.exp | 4 | ||||
-rw-r--r-- | gdb/testsuite/gdb.base/inferior-args.exp | 7 | ||||
-rw-r--r-- | gdbserver/server.cc | 6 |
3 files changed, 7 insertions, 10 deletions
diff --git a/gdb/testsuite/gdb.base/args.exp b/gdb/testsuite/gdb.base/args.exp index 0b55c44..092b44b 100644 --- a/gdb/testsuite/gdb.base/args.exp +++ b/gdb/testsuite/gdb.base/args.exp @@ -94,10 +94,10 @@ save_vars { GDBFLAGS } { # Try with arguments containing literal single quotes. set GDBFLAGS "$old_gdbflags --args $binfile 1 '' 3" - args_test "one empty with single quotes" {{1} {''} {3}} $single_quotes_newline_kfail + args_test "one empty with single quotes" {{1} {''} {3}} set GDBFLAGS "$old_gdbflags --args $binfile 1 '' '' 3" - args_test "two empty with single quotes" {{1} {''} {''} {3}} $single_quotes_newline_kfail + args_test "two empty with single quotes" {{1} {''} {''} {3}} # try with arguments containing literal newlines. diff --git a/gdb/testsuite/gdb.base/inferior-args.exp b/gdb/testsuite/gdb.base/inferior-args.exp index 19bada6..3d3cd39 100644 --- a/gdb/testsuite/gdb.base/inferior-args.exp +++ b/gdb/testsuite/gdb.base/inferior-args.exp @@ -29,7 +29,7 @@ proc do_test { method } { global binfile hex # The second arg is an empty string on purpose. - set inferior_args { "first arg" "" "third-arg" } + set inferior_args { "first arg" "" "third-arg" "'" "\"" " " } clean_restart $binfile @@ -109,11 +109,14 @@ proc do_test { method } { } # Now that we are stopped at main, inspect argc/argv. - gdb_test "print argc" " = 4" + gdb_test "print argc" " = 7" gdb_test "print argv\[0\]" " = $hex \".*\"" gdb_test "print argv\[1\]" " = $hex \"first arg\"" gdb_test "print argv\[2\]" " = $hex \"\"" gdb_test "print argv\[3\]" " = $hex \"third-arg\"" + gdb_test "print argv\[4\]" " = $hex \"'\"" + gdb_test "print argv\[5\]" " = $hex \"\\\\\"\"" + gdb_test "print argv\[6\]" " = $hex \" \"" } foreach_with_prefix method { "start" "starti" "run" "set args" } { diff --git a/gdbserver/server.cc b/gdbserver/server.cc index c572701..496b9be 100644 --- a/gdbserver/server.cc +++ b/gdbserver/server.cc @@ -3011,12 +3011,6 @@ handle_v_run (char *own_buf) need_quote = 1; break; - case '\'': - /* Quote single quote. */ - *tmp_full_arg = '\\'; - ++tmp_full_arg; - break; - default: break; } |